0-235 Nu Chrome

[rebel]

My 0-235 saga continues.....

I have now confirmed that the engine was originally manufactured as 118hp at
2800rpm. The modification which installed 108hp low compression pistons can
easily be restored by replacing the pistons with 8.5:1 high compression
pistons. That's the easy bit. According to the logs the cylinders were NU
chromed at the o/h stage. An engineer that works on lycomings suggested that
chroming process may have removed sufficient material to leave the cylinders
vulnerable to cracking under the higher pressures???????? I must say that I
do not readily accept this idea as there are cylinders out there that have
been chromed and kept at their original hp rating without problems.
Strangley, the cylinders are not paint coded for chromed barrels.

Another quirk has arisen with regards to the modification. The logs state
that 1/2" exhaust valves were fitted but the engineer said this was not
possible because the 1/2" valves were not introduced until the 0-320 model.
Lycoming have confirmed that there is no approval for this mod either but did
not confirm or deny that it was possible to be done.???????? If it was done
what effect would it have on the performance and should it be restored to the
7/16th(I believe)?

Bob





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[Wayne G. O'Shea]

Bob, did you talk with an Engineer or was he a salesman for Lycoming. If not
he should be!!!

You can remove no more than 26thou, I'm told for a O-320 at least (and
figure they're all about the same), from standard bore to clean up a
cylinder prior to chroming back to std size. Anymore removal than this
leaves the cylinders too thin and then you would be very prone to cracking.
If the engine was done by a reputable shop I'm sure they didn't remove
anymore than that and most likely only 10 or 15thou if the cylinders were
"worn" from std size to start with thus needing a refurb.

O-320's didn't have 1/2" valves in the originally either (older ones had
7/16"), although when you are buying one or overhauling one make sure it is
upgraded to such. If the O-235 is homebuilt category engine then there is no
reason that it couldn't have the same treatment and get the bigger valve
diameter (if indeed Lycoming doesn't approve, but can't see why). Why would
you want to change them back if you have the better valves?

Cheers,
Wayne

P.S. Did you not get the personal email I took the time to write the other
night?

----- Original Message -----
From: <rebel@dcsol.com>
To: <murphy-rebel@dcsol.com>
Sent: Wednesday, April 30, 2003 4:32 PM
Subject: 0-235 Nu Chrome

My 0-235 saga continues.....

I have now confirmed that the engine was originally manufactured as 118hp

at

2800rpm. The modification which installed 108hp low compression pistons

can

easily be restored by replacing the pistons with 8.5:1 high compression
pistons. That's the easy bit. According to the logs the cylinders were

NU

chromed at the o/h stage. An engineer that works on lycomings suggested

that

chroming process may have removed sufficient material to leave the

cylinders

vulnerable to cracking under the higher pressures???????? I must say that

I

do not readily accept this idea as there are cylinders out there that have
been chromed and kept at their original hp rating without problems.
Strangley, the cylinders are not paint coded for chromed barrels.

Another quirk has arisen with regards to the modification. The logs state
that 1/2" exhaust valves were fitted but the engineer said this was not
possible because the 1/2" valves were not introduced until the 0-320

model.

Lycoming have confirmed that there is no approval for this mod either but

did

not confirm or deny that it was possible to be done.???????? If it was

done

what effect would it have on the performance and should it be restored to

the

7/16th(I believe)?

Bob

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[bob.hyatt]

Hhi Bob,

That is the twist in all this the engine itself runs beautifully, I cannot
answer the question of oversize/standard pistons now, log does not seem to
tell me that bit. I know that the previous owner had the pitch set at
15degrees (4" in from the tip) and I could only get around 2000rpm (static I
recall) I repitched it to obtain 2300 rpm static and this came out at
11.5deg. I was working on a max rpm of 2400rpm.

Tires? MacCauley?? not thick tundra type but more you C-152 variety. I can
see your point though, the wider the tyre the less it will dig into the
ground, hence, less drag more speed.

Regards,

Bob


On 4/30/2003 11:36 PM, APAT@ISTAR.CA wrote to MURPHY-REBEL:

-> From <apat@istar.ca> Wed, 30 Apr 2003 18:30:10 -0800 remote from dcsol.com
-> Received: by dcsol.com (Wildcat! SMTP Router v5.6.450.61)
-> for murphy-rebel@dcsol.com; Wed, 30 Apr 2003 18:30:10 -0800
-> Received: from nasc-out-1.nasc.inter.net ([203.176.60.253])
EHLO=app4.nasc.inter.net
-> by dcsol.com (Wildcat! SMTP v5.6.450.61) with SMTP
-> id 116144953; Wed, 30 Apr 2003 18:30:04 -0800
-> Received: from 2cust75.tnt23.toronto.on.da.uu.net ([64.10.100.75])
-> by app4.nasc.inter.net with smtp (Exim 3.34 #1)
-> id 19B3pz-0003fY-00
-> for murphy-rebel@dcsol.com; Wed, 30 Apr 2003 22:30:20 -0400
-> X-Sender: crs1188@pop.ca.inter.net
-> X-Mailer: Windows Eudora Light Version 1.5.2
-> X-Orig-Mime-Version: 1.0
-> X-Orig-Content-Type: text/plain; charset="us-ascii"
-> To: <murphy-rebel@dcsol.com>
-> From: Bob Patterson <apat@istar.ca>
-> Subject: Re: 0-235 Nu Chrome
-> Message-Id: <E19B3pz-0003fY-00@app4.nasc.inter.net>
-> Date: Wed, 30 Apr 2003 22:30:20 -0400
->
->
-> If the engine is not using excessive oil, then your rings
-> have seated well on the chrome, and maybe it's not a good idea
-> to mess with it.....
->
-> Larger valves are a "Good Thing"(tm) - again, if they're
-> working OK, don't tinker !!
->
-> It would be good to know if the pistons were oversize
-> or standard - if standard, you shouldn't have a big problem
-> changing back, but again, please try tweaking prop settings first.
-> Sounds like just getting another couple of hundred rpm might
-> make a BIG improvement for you !
->
-> Another thought - get the tail up as quickly as possible
-> on takeoff, to reduce drag. I recall that my O-235 Rebel used
-> to roll about 400 ft. on grass, solo. What tures do you have ??
->
-> .....bobp
->
-> ------------------------------------orig.----------------------------
-> At 12:32 PM 4/30/03 -0800, you wrote:
-> >My 0-235 saga continues.....
-> >
-> >I have now confirmed that the engine was originally manufactured as 118hp
at
-> >2800rpm. The modification which installed 108hp low compression pistons
can
-> >easily be restored by replacing the pistons with 8.5:1 high compression
-> >pistons. That's the easy bit. According to the logs the cylinders were
NU
-> >chromed at the o/h stage. An engineer that works on lycomings suggested
that
-> >chroming process may have removed sufficient material to leave the
cylinders
-> >vulnerable to cracking under the higher pressures???????? I must say
that I
-> >do not readily accept this idea as there are cylinders out there that
have
-> >been chromed and kept at their original hp rating without problems.
-> >Strangley, the cylinders are not paint coded for chromed barrels.
-> >
-> >Another quirk has arisen with regards to the modification. The logs
state
-> >that 1/2" exhaust valves were fitted but the engineer said this was not
-> >possible because the 1/2" valves were not introduced until the 0-320
model.
-> >Lycoming have confirmed that there is no approval for this mod either but
did
-> >not confirm or deny that it was possible to be done.???????? If it was
done
-> >what effect would it have on the performance and should it be restored to
the
-> >7/16th(I believe)?
-> >
-> >Bob
-> >
-> >
-> >
-> >
-> >
-> >*-------------------------------------------------------------------------
*
-> > To unsubscribe from this list go to:
-> > http://www.dcsol.com:81/public/code/html-subscribe.wcx
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-> >
-> >
-> >
-> >
->




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[Bob Patterson]

If the engine is not using excessive oil, then your rings
have seated well on the chrome, and maybe it's not a good idea
to mess with it.....

Larger valves are a "Good Thing"(tm) - again, if they're
working OK, don't tinker !!

It would be good to know if the pistons were oversize
or standard - if standard, you shouldn't have a big problem
changing back, but again, please try tweaking prop settings first.
Sounds like just getting another couple of hundred rpm might
make a BIG improvement for you !

Another thought - get the tail up as quickly as possible
on takeoff, to reduce drag. I recall that my O-235 Rebel used
to roll about 400 ft. on grass, solo. What tures do you have ??

.....bobp

------------------------------------orig.----------------------------
At 12:32 PM 4/30/03 -0800, you wrote:

My 0-235 saga continues.....

I have now confirmed that the engine was originally manufactured as 118hp at
2800rpm. The modification which installed 108hp low compression pistons can
easily be restored by replacing the pistons with 8.5:1 high compression
pistons. That's the easy bit. According to the logs the cylinders were NU
chromed at the o/h stage. An engineer that works on lycomings suggested that
chroming process may have removed sufficient material to leave the cylinders
vulnerable to cracking under the higher pressures???????? I must say that I
do not readily accept this idea as there are cylinders out there that have
been chromed and kept at their original hp rating without problems.
Strangley, the cylinders are not paint coded for chromed barrels.

Another quirk has arisen with regards to the modification. The logs state
that 1/2" exhaust valves were fitted but the engineer said this was not
possible because the 1/2" valves were not introduced until the 0-320 model.
Lycoming have confirmed that there is no approval for this mod either but did
not confirm or deny that it was possible to be done.???????? If it was done
what effect would it have on the performance and should it be restored to the
7/16th(I believe)?

Bob





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[rebel]

Thanks Ken,

There seems to be a few factors to be taken into account to get the right
performance. I am still leaning towards increasing the power available, which
in turn must be available in each phase of flight.

Bob


On 5/1/2003 10:40 AM, KLEHMAN@ALBEDO.NET wrote to MURPHY-REBEL:

-> From <klehman@albedo.net> Thu, 01 May 2003 04:45:03 -0800 remote from
dcsol.com
-> Received: by dcsol.com (Wildcat! SMTP Router v5.6.450.61)
-> for murphy-rebel@dcsol.com; Thu, 01 May 2003 04:45:03 -0800
-> Received: from juliet.albedo.net ([206.51.22.2]) EHLO=juliet.albedo.net
-> by dcsol.com (Wildcat! SMTP v5.6.450.61) with SMTP
-> id 153043453; Thu, 01 May 2003 04:45:02 -0800
-> Received: from albedo.net (ppp130.albedo.net [206.51.22.130])
-> (authenticated bits=0)
-> by juliet.albedo.net (8.12.3/8.12.3) with ESMTP id h41CjIfG026766
-> for <murphy-rebel@dcsol.com>; Thu, 1 May 2003 08:45:19 -0400
-> Message-ID: <3EB11213.2080307@albedo.net>
-> Date: Thu, 01 May 2003 08:24:51 -0400
-> From: klehman@albedo.net
-> User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.2) Gecko/20021120
Netscape/7.01
-> X-Accept-Language: en-us, en
-> X-Orig-MIME-Version: 1.0
-> To: murphy-rebel@dcsol.com
-> Subject: Re: 0-235 Nu Chrome
-> References: <1051774906@dcsol.com>
-> X-Orig-Content-Type: text/plain; charset=us-ascii; format=flowed
-> X-Orig-Content-Transfer-Encoding: 7bit
->
-> This is probably redundant as Bobp has already pretty much said it but
-> if you look at a chart of engine power vs. rpm it is surprizing how
-> little power some of these engines make while going down a runway while
-> running 300 or 400 rpm below rated rpm. I think Lycomings usually have
-> to turn about 2700 rpm to make rated power. There are lots of
-> installations that can barely get 110 hp out of a 150 hp engine.
->
-> Did Ivo ever solve their variable pitch blade retention problems? Seems
-> odd that you don't seem to hear of those props on rebels.
->
-> Ken
->
-> bob.hyatt@dcsol.com wrote:
-> > Hhi Bob,
-> >
-> > That is the twist in all this the engine itself runs beautifully, I
cannot
-> > answer the question of oversize/standard pistons now, log does not seem
to
-> > tell me that bit. I know that the previous owner had the pitch set at
-> > 15degrees (4" in from the tip) and I could only get around 2000rpm
(static I
-> > recall) I repitched it to obtain 2300 rpm static and this came out at
-> > 11.5deg. I was working on a max rpm of 2400rpm.
-> >
-> > Tires? MacCauley?? not thick tundra type but more you C-152 variety. I
can
-> > see your point though, the wider the tyre the less it will dig into the
-> > ground, hence, less drag more speed.
-> >
-> > Regards,
-> >
-> > -> From: Bob Patterson <apat@istar.ca>
-> > -> Subject: Re: 0-235 Nu Chrome
-> > -> Message-Id: <E19B3pz-0003fY-00@app4.nasc.inter.net>
-> > -> Date: Wed, 30 Apr 2003 22:30:20 -0400
-> > ->
-> > ->
-> > -> If the engine is not using excessive oil, then your rings
-> > -> have seated well on the chrome, and maybe it's not a good idea
-> > -> to mess with it.....
-> > ->
-> > -> Larger valves are a "Good Thing"(tm) - again, if they're
-> > -> working OK, don't tinker !!
-> > ->
-> > -> It would be good to know if the pistons were oversize
-> > -> or standard - if standard, you shouldn't have a big problem
-> > -> changing back, but again, please try tweaking prop settings first.
-> > -> Sounds like just getting another couple of hundred rpm might
-> > -> make a BIG improvement for you !
-> > ->
-> > -> Another thought - get the tail up as quickly as possible
-> > -> on takeoff, to reduce drag. I recall that my O-235 Rebel used
-> > -> to roll about 400 ft. on grass, solo. What tures do you have ??
-> > ->
-> > -> .....bobp
->
->




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[rebel]

I am uncertain as to the hp of the subaru but again your prop diameter seems
to point to the fact that mine is undesized.

Bob


On 5/1/2003 10:50 AM, DKY33@HOTMAIL.COM wrote to MURPHY-REBEL:

-> From <dky33@hotmail.com> Thu, 01 May 2003 06:29:36 -0800 remote from
dcsol.com
-> Received: by dcsol.com (Wildcat! SMTP Router v5.6.450.61)
-> for murphy-rebel@dcsol.com; Thu, 01 May 2003 06:29:36 -0800
-> Received: from f60.law14.hotmail.com ([64.4.21.60]) EHLO=hotmail.com
-> by dcsol.com (Wildcat! SMTP v5.6.450.61) with SMTP
-> id 159316515; Thu, 01 May 2003 06:29:35 -0800
-> Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC;
-> Thu, 1 May 2003 07:29:53 -0700
-> Received: from 12.4.27.248 by lw14fd.law14.hotmail.msn.com with HTTP;
-> Thu, 01 May 2003 14:29:53 GMT
-> X-Originating-IP: [12.4.27.248]
-> X-Originating-Email: [dky33@hotmail.com]
-> From: "Dick Kyro" <dky33@hotmail.com>
-> To: murphy-rebel@dcsol.com
-> Bcc:
-> Subject: Re: 0-235 Nu Chrome
-> Date: Thu, 01 May 2003 09:29:53 -0500
-> X-Orig-Mime-Version: 1.0
-> X-Orig-Content-Type: text/plain; format=flowed
-> Message-ID: <Law14-F60kB4ltFlmml00006b5e@hotmail.com>
-> X-OriginalArrivalTime: 01 May 2003 14:29:53.0543 (UTC) FILETIME=
[2183E170:01C30FEE]
->
-> I have a IVO Magnum 72" ground adjustable prop on my Subaru powered Rebel.
I
-> have not had a blade move yet, but it is a bit of a pain to
-> remove the spinner every 10 hrs to check the metalized tape between the
-> blades for breakage.
->
-> Dick
-> R206
->
->
->
->
->
->
-> >From: klehman@albedo.net
-> >Reply-To: <murphy-rebel@dcsol.com>
-> >To: murphy-rebel@dcsol.com
-> >Subject: Re: 0-235 Nu Chrome
-> >Date: Thu, 01 May 2003 08:24:51 -0400
-> >
-> >This is probably redundant as Bobp has already pretty much said it but
-> >if you look at a chart of engine power vs. rpm it is surprizing how
-> >little power some of these engines make while going down a runway while
-> >running 300 or 400 rpm below rated rpm. I think Lycomings usually have
-> >to turn about 2700 rpm to make rated power. There are lots of
-> >installations that can barely get 110 hp out of a 150 hp engine.
-> >
-> >Did Ivo ever solve their variable pitch blade retention problems? Seems
-> >odd that you don't seem to hear of those props on rebels.
-> >
-> >Ken
-> >
-> >bob.hyatt@dcsol.com wrote:
-> > > Hhi Bob,
-> > >
-> > > That is the twist in all this the engine itself runs beautifully, I
-> >cannot
-> > > answer the question of oversize/standard pistons now, log does not seem
-> >to
-> > > tell me that bit. I know that the previous owner had the pitch set at
-> > > 15degrees (4" in from the tip) and I could only get around 2000rpm
-> >(static I
-> > > recall) I repitched it to obtain 2300 rpm static and this came out at
-> > > 11.5deg. I was working on a max rpm of 2400rpm.
-> > >
-> > > Tires? MacCauley?? not thick tundra type but more you C-152 variety.
I
-> >can
-> > > see your point though, the wider the tyre the less it will dig into the
-> > > ground, hence, less drag more speed.
-> > >
-> > > Regards,
-> > >
-> > > -> From: Bob Patterson <apat@istar.ca>
-> > > -> Subject: Re: 0-235 Nu Chrome
-> > > -> Message-Id: <E19B3pz-0003fY-00@app4.nasc.inter.net>
-> > > -> Date: Wed, 30 Apr 2003 22:30:20 -0400
-> > > ->
-> > > ->
-> > > -> If the engine is not using excessive oil, then your rings
-> > > -> have seated well on the chrome, and maybe it's not a good idea
-> > > -> to mess with it.....
-> > > ->
-> > > -> Larger valves are a "Good Thing"(tm) - again, if they're
-> > > -> working OK, don't tinker !!
-> > > ->
-> > > -> It would be good to know if the pistons were oversize
-> > > -> or standard - if standard, you shouldn't have a big problem
-> > > -> changing back, but again, please try tweaking prop settings first.
-> > > -> Sounds like just getting another couple of hundred rpm might
-> > > -> make a BIG improvement for you !
-> > > ->
-> > > -> Another thought - get the tail up as quickly as possible
-> > > -> on takeoff, to reduce drag. I recall that my O-235 Rebel used
-> > > -> to roll about 400 ft. on grass, solo. What tures do you have ??
-> > > ->
-> > > -> .....bobp
-> >
-> >
-> >
-> >
-> >*-------------------------------------------------------------------------*
-> > To unsubscribe from this list go to:
-> > http://www.dcsol.com:81/public/code/html-subscribe.wcx
-> > Archives located at http://rebel:builder@www.dcsol.com:81/default.htm
-> > To contact the list admin, e-mail mike.davis@dcsol.com
-> >*-------------------------------------------------------------------------*
-> >
-> >
-> >
->
->
-> _________________________________________________________________
-> Help STOP SPAM with the new MSN 8 and get 2 months FREE*
-> http://join.msn.com/?page=features/junkmail
->




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[rebel]

I know that wd told me that for the 0-235 they would have expected a prop
diameter of 68 -70". It seems from the opinions I have seen that most think
that the 68" may be on the small side. It may prove somewhat academic though
if I plumb for the sensenich. I know that there are plenty of rebels turning
wd now. What I think I wil do is uprate the engine and see how it goes with
the wd. Then decide on th prop.

Bob


On 5/1/2003 11:34 AM, DKY33@HOTMAIL.COM wrote to MURPHY-REBEL:

-> From <dky33@hotmail.com> Thu, 01 May 2003 11:14:58 -0800 remote from
dcsol.com
-> Received: by dcsol.com (Wildcat! SMTP Router v5.6.450.61)
-> for murphy-rebel@dcsol.com; Thu, 01 May 2003 11:14:58 -0800
-> Received: from f8.law14.hotmail.com ([64.4.21.8]) EHLO=hotmail.com
-> by dcsol.com (Wildcat! SMTP v5.6.450.61) with SMTP
-> id 176437187; Thu, 01 May 2003 11:14:56 -0800
-> Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC;
-> Thu, 1 May 2003 12:15:14 -0700
-> Received: from 12.4.27.248 by lw14fd.law14.hotmail.msn.com with HTTP;
-> Thu, 01 May 2003 19:15:14 GMT
-> X-Originating-IP: [12.4.27.248]
-> X-Originating-Email: [dky33@hotmail.com]
-> From: "Dick Kyro" <dky33@hotmail.com>
-> To: murphy-rebel@dcsol.com
-> Bcc:
-> Subject: Re: 0-235 Nu Chrome
-> Date: Thu, 01 May 2003 14:15:14 -0500
-> X-Orig-Mime-Version: 1.0
-> X-Orig-Content-Type: text/plain; format=flowed
-> Message-ID: <Law14-F86bdVJWrGW6E0002c614@hotmail.com>
-> X-OriginalArrivalTime: 01 May 2003 19:15:14.0467 (UTC) FILETIME=
[FE618F30:01C31015]
->
-> Not necessarily, the Sub is a stock 2.2 listed at 130 hp. It is
-> turning the prop thru a Ross 2.17/1 reduction drive, so my prop speed is
-> relatively slow. I typically cruise at about 4600 rpm engine, which gives
me
-> a little over 2100 prop rpm.
->
->
->
->
->
->
-> >From: rebel@dcsol.com
-> >Reply-To: <murphy-rebel@dcsol.com>
-> >To: murphy-rebel@dcsol.com
-> >Subject: Re: 0-235 Nu Chrome
-> >Date: Thu, 01 May 2003 10:51:34 -0800
-> >
-> >I am uncertain as to the hp of the subaru but again your prop diameter
-> >seems
-> >to point to the fact that mine is undesized.
-> >
-> >Bob
-> >
-> >
-> >On 5/1/2003 10:50 AM, DKY33@HOTMAIL.COM wrote to MURPHY-REBEL:
-> >
-> >-> From <dky33@hotmail.com> Thu, 01 May 2003 06:29:36 -0800 remote from
-> >dcsol.com
-> >-> Received: by dcsol.com (Wildcat! SMTP Router v5.6.450.61)
-> >-> for murphy-rebel@dcsol.com; Thu, 01 May 2003 06:29:36 -0800
-> >-> Received: from f60.law14.hotmail.com ([64.4.21.60]) EHLO=hotmail.com
-> >-> by dcsol.com (Wildcat! SMTP v5.6.450.61) with SMTP
-> >-> id 159316515; Thu, 01 May 2003 06:29:35 -0800
-> >-> Received: from mail pickup service by hotmail.com with Microsoft
-> >SMTPSVC;
-> >-> Thu, 1 May 2003 07:29:53 -0700
-> >-> Received: from 12.4.27.248 by lw14fd.law14.hotmail.msn.com with HTTP;
-> >-> Thu, 01 May 2003 14:29:53 GMT
-> >-> X-Originating-IP: [12.4.27.248]
-> >-> X-Originating-Email: [dky33@hotmail.com]
-> >-> From: "Dick Kyro" <dky33@hotmail.com>
-> >-> To: murphy-rebel@dcsol.com
-> >-> Bcc:
-> >-> Subject: Re: 0-235 Nu Chrome
-> >-> Date: Thu, 01 May 2003 09:29:53 -0500
-> >-> X-Orig-Mime-Version: 1.0
-> >-> X-Orig-Content-Type: text/plain; format=flowed
-> >-> Message-ID: <Law14-F60kB4ltFlmml00006b5e@hotmail.com>
-> >-> X-OriginalArrivalTime: 01 May 2003 14:29:53.0543 (UTC) FILETIME=
-> >[2183E170:01C30FEE]
-> >->
-> >-> I have a IVO Magnum 72" ground adjustable prop on my Subaru powered
-> >Rebel.
-> >I
-> >-> have not had a blade move yet, but it is a bit of a pain to
-> >-> remove the spinner every 10 hrs to check the metalized tape between the
-> >-> blades for breakage.
-> >->
-> >-> Dick
-> >-> R206
-> >->
-> >->
-> >->
-> >->
-> >->
-> >->
-> >-> >From: klehman@albedo.net
-> >-> >Reply-To: <murphy-rebel@dcsol.com>
-> >-> >To: murphy-rebel@dcsol.com
-> >-> >Subject: Re: 0-235 Nu Chrome
-> >-> >Date: Thu, 01 May 2003 08:24:51 -0400
-> >-> >
-> >-> >This is probably redundant as Bobp has already pretty much said it but
-> >-> >if you look at a chart of engine power vs. rpm it is surprizing how
-> >-> >little power some of these engines make while going down a runway while
-> >-> >running 300 or 400 rpm below rated rpm. I think Lycomings usually have
-> >-> >to turn about 2700 rpm to make rated power. There are lots of
-> >-> >installations that can barely get 110 hp out of a 150 hp engine.
-> >-> >
-> >-> >Did Ivo ever solve their variable pitch blade retention problems? Seems
-> >-> >odd that you don't seem to hear of those props on rebels.
-> >-> >
-> >-> >Ken
-> >-> >
-> >-> >bob.hyatt@dcsol.com wrote:
-> >-> > > Hhi Bob,
-> >-> > >
-> >-> > > That is the twist in all this the engine itself runs beautifully, I
-> >-> >cannot
-> >-> > > answer the question of oversize/standard pistons now, log does not
-> >seem
-> >-> >to
-> >-> > > tell me that bit. I know that the previous owner had the pitch set
-> >at
-> >-> > > 15degrees (4" in from the tip) and I could only get around 2000rpm
-> >-> >(static I
-> >-> > > recall) I repitched it to obtain 2300 rpm static and this came out
-> >at
-> >-> > > 11.5deg. I was working on a max rpm of 2400rpm.
-> >-> > >
-> >-> > > Tires? MacCauley?? not thick tundra type but more you C-152
-> >variety.
-> >I
-> >-> >can
-> >-> > > see your point though, the wider the tyre the less it will dig into
-> >the
-> >-> > > ground, hence, less drag more speed.
-> >-> > >
-> >-> > > Regards,
-> >-> > >
-> >-> > > -> From: Bob Patterson <apat@istar.ca>
-> >-> > > -> Subject: Re: 0-235 Nu Chrome
-> >-> > > -> Message-Id: <E19B3pz-0003fY-00@app4.nasc.inter.net>
-> >-> > > -> Date: Wed, 30 Apr 2003 22:30:20 -0400
-> >-> > > ->
-> >-> > > ->
-> >-> > > -> If the engine is not using excessive oil, then your rings
-> >-> > > -> have seated well on the chrome, and maybe it's not a good idea
-> >-> > > -> to mess with it.....
-> >-> > > ->
-> >-> > > -> Larger valves are a "Good Thing"(tm) - again, if they're
-> >-> > > -> working OK, don't tinker !!
-> >-> > > ->
-> >-> > > -> It would be good to know if the pistons were oversize
-> >-> > > -> or standard - if standard, you shouldn't have a big problem
-> >-> > > -> changing back, but again, please try tweaking prop settings
-> >first.
-> >-> > > -> Sounds like just getting another couple of hundred rpm might
-> >-> > > -> make a BIG improvement for you !
-> >-> > > ->
-> >-> > > -> Another thought - get the tail up as quickly as possible
-> >-> > > -> on takeoff, to reduce drag. I recall that my O-235 Rebel used
-> >-> > > -> to roll about 400 ft. on grass, solo. What tures do you have ??
-> >-> > > ->
-> >-> > > -> .....bobp
-> >-> >
-> >-> >
-> >-> >
-> >-> >
-> >->
-> > >*------------------------------------------------------------------------
-*
-> >-> > To unsubscribe from this list go to:
-> >-> > http://www.dcsol.com:81/public/code/html-subscribe.wcx
-> >-> > Archives located at http://rebel:builder@www.dcsol.com:81/default.htm
-> >-> > To contact the list admin, e-mail mike.davis@dcsol.com
-> >->
-> > >*------------------------------------------------------------------------
-*
-> >-> >
-> >-> >
-> >-> >
-> >->
-> >->
-> >-> _________________________________________________________________
-> >-> Help STOP SPAM with the new MSN 8 and get 2 months FREE*
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-> > To contact the list admin, e-mail mike.davis@dcsol.com
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->
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-> _________________________________________________________________
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[klehman]

This is probably redundant as Bobp has already pretty much said it but
if you look at a chart of engine power vs. rpm it is surprizing how
little power some of these engines make while going down a runway while
running 300 or 400 rpm below rated rpm. I think Lycomings usually have
to turn about 2700 rpm to make rated power. There are lots of
installations that can barely get 110 hp out of a 150 hp engine.

Did Ivo ever solve their variable pitch blade retention problems? Seems
odd that you don't seem to hear of those props on rebels.

Ken

bob.hyatt@dcsol.com wrote:

Hhi Bob,

That is the twist in all this the engine itself runs beautifully, I cannot
answer the question of oversize/standard pistons now, log does not seem to
tell me that bit. I know that the previous owner had the pitch set at
15degrees (4" in from the tip) and I could only get around 2000rpm (static I
recall) I repitched it to obtain 2300 rpm static and this came out at
11.5deg. I was working on a max rpm of 2400rpm.

Tires? MacCauley?? not thick tundra type but more you C-152 variety. I can
see your point though, the wider the tyre the less it will dig into the
ground, hence, less drag more speed.

Regards,

-> From: Bob Patterson <apat@istar.ca>
-> Subject: Re: 0-235 Nu Chrome
-> Message-Id: <E19B3pz-0003fY-00@app4.nasc.inter.net>
-> Date: Wed, 30 Apr 2003 22:30:20 -0400
->
->
-> If the engine is not using excessive oil, then your rings
-> have seated well on the chrome, and maybe it's not a good idea
-> to mess with it.....
->
-> Larger valves are a "Good Thing"(tm) - again, if they're
-> working OK, don't tinker !!
->
-> It would be good to know if the pistons were oversize
-> or standard - if standard, you shouldn't have a big problem
-> changing back, but again, please try tweaking prop settings first.
-> Sounds like just getting another couple of hundred rpm might
-> make a BIG improvement for you !
->
-> Another thought - get the tail up as quickly as possible
-> on takeoff, to reduce drag. I recall that my O-235 Rebel used
-> to roll about 400 ft. on grass, solo. What tures do you have ??
->
-> .....bobp

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[Dick Kyro]

I have a IVO Magnum 72" ground adjustable prop on my Subaru powered Rebel. I
have not had a blade move yet, but it is a bit of a pain to
remove the spinner every 10 hrs to check the metalized tape between the
blades for breakage.

Dick
R206

From: klehman@albedo.net
Reply-To: <murphy-rebel@dcsol.com>
To: murphy-rebel@dcsol.com
Subject: Re: 0-235 Nu Chrome
Date: Thu, 01 May 2003 08:24:51 -0400

This is probably redundant as Bobp has already pretty much said it but
if you look at a chart of engine power vs. rpm it is surprizing how
little power some of these engines make while going down a runway while
running 300 or 400 rpm below rated rpm. I think Lycomings usually have
to turn about 2700 rpm to make rated power. There are lots of
installations that can barely get 110 hp out of a 150 hp engine.

Did Ivo ever solve their variable pitch blade retention problems? Seems
odd that you don't seem to hear of those props on rebels.

Ken

bob.hyatt@dcsol.com wrote:

Hhi Bob,

That is the twist in all this the engine itself runs beautifully, I

cannot

answer the question of oversize/standard pistons now, log does not seem

to

tell me that bit. I know that the previous owner had the pitch set at
15degrees (4" in from the tip) and I could only get around 2000rpm

(static I

recall) I repitched it to obtain 2300 rpm static and this came out at
11.5deg. I was working on a max rpm of 2400rpm.

Tires? MacCauley?? not thick tundra type but more you C-152 variety. I

can

see your point though, the wider the tyre the less it will dig into the
ground, hence, less drag more speed.

Regards,

-> From: Bob Patterson <apat@istar.ca>
-> Subject: Re: 0-235 Nu Chrome
-> Message-Id: <E19B3pz-0003fY-00@app4.nasc.inter.net>
-> Date: Wed, 30 Apr 2003 22:30:20 -0400
->
->
-> If the engine is not using excessive oil, then your rings
-> have seated well on the chrome, and maybe it's not a good idea
-> to mess with it.....
->
-> Larger valves are a "Good Thing"(tm) - again, if they're
-> working OK, don't tinker !!
->
-> It would be good to know if the pistons were oversize
-> or standard - if standard, you shouldn't have a big problem
-> changing back, but again, please try tweaking prop settings first.
-> Sounds like just getting another couple of hundred rpm might
-> make a BIG improvement for you !
->
-> Another thought - get the tail up as quickly as possible
-> on takeoff, to reduce drag. I recall that my O-235 Rebel used
-> to roll about 400 ft. on grass, solo. What tures do you have ??
->
-> .....bobp

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[Dick Kyro]

Not necessarily, the Sub is a stock 2.2 listed at 130 hp. It is
turning the prop thru a Ross 2.17/1 reduction drive, so my prop speed is
relatively slow. I typically cruise at about 4600 rpm engine, which gives me
a little over 2100 prop rpm.

From: rebel@dcsol.com
Reply-To: <murphy-rebel@dcsol.com>
To: murphy-rebel@dcsol.com
Subject: Re: 0-235 Nu Chrome
Date: Thu, 01 May 2003 10:51:34 -0800

I am uncertain as to the hp of the subaru but again your prop diameter
seems
to point to the fact that mine is undesized.

Bob


On 5/1/2003 10:50 AM, DKY33@HOTMAIL.COM wrote to MURPHY-REBEL:

-> From <dky33@hotmail.com> Thu, 01 May 2003 06:29:36 -0800 remote from
dcsol.com
-> Received: by dcsol.com (Wildcat! SMTP Router v5.6.450.61)
-> for murphy-rebel@dcsol.com; Thu, 01 May 2003 06:29:36 -0800
-> Received: from f60.law14.hotmail.com ([64.4.21.60]) EHLO=hotmail.com
-> by dcsol.com (Wildcat! SMTP v5.6.450.61) with SMTP
-> id 159316515; Thu, 01 May 2003 06:29:35 -0800
-> Received: from mail pickup service by hotmail.com with Microsoft
SMTPSVC;
-> Thu, 1 May 2003 07:29:53 -0700
-> Received: from 12.4.27.248 by lw14fd.law14.hotmail.msn.com with HTTP;
-> Thu, 01 May 2003 14:29:53 GMT
-> X-Originating-IP: [12.4.27.248]
-> X-Originating-Email: [dky33@hotmail.com]
-> From: "Dick Kyro" <dky33@hotmail.com>
-> To: murphy-rebel@dcsol.com
-> Bcc:
-> Subject: Re: 0-235 Nu Chrome
-> Date: Thu, 01 May 2003 09:29:53 -0500
-> X-Orig-Mime-Version: 1.0
-> X-Orig-Content-Type: text/plain; format=flowed
-> Message-ID: <Law14-F60kB4ltFlmml00006b5e@hotmail.com>
-> X-OriginalArrivalTime: 01 May 2003 14:29:53.0543 (UTC) FILETIME=
[2183E170:01C30FEE]
->
-> I have a IVO Magnum 72" ground adjustable prop on my Subaru powered
Rebel.
I
-> have not had a blade move yet, but it is a bit of a pain to
-> remove the spinner every 10 hrs to check the metalized tape between the
-> blades for breakage.
->
-> Dick
-> R206
->
->
->
->
->
->
-> >From: klehman@albedo.net
-> >Reply-To: <murphy-rebel@dcsol.com>
-> >To: murphy-rebel@dcsol.com
-> >Subject: Re: 0-235 Nu Chrome
-> >Date: Thu, 01 May 2003 08:24:51 -0400
-> >
-> >This is probably redundant as Bobp has already pretty much said it but
-> >if you look at a chart of engine power vs. rpm it is surprizing how
-> >little power some of these engines make while going down a runway while
-> >running 300 or 400 rpm below rated rpm. I think Lycomings usually have
-> >to turn about 2700 rpm to make rated power. There are lots of
-> >installations that can barely get 110 hp out of a 150 hp engine.
-> >
-> >Did Ivo ever solve their variable pitch blade retention problems? Seems
-> >odd that you don't seem to hear of those props on rebels.
-> >
-> >Ken
-> >
-> >bob.hyatt@dcsol.com wrote:
-> > > Hhi Bob,
-> > >
-> > > That is the twist in all this the engine itself runs beautifully, I
-> >cannot
-> > > answer the question of oversize/standard pistons now, log does not
seem
-> >to
-> > > tell me that bit. I know that the previous owner had the pitch set
at
-> > > 15degrees (4" in from the tip) and I could only get around 2000rpm
-> >(static I
-> > > recall) I repitched it to obtain 2300 rpm static and this came out
at
-> > > 11.5deg. I was working on a max rpm of 2400rpm.
-> > >
-> > > Tires? MacCauley?? not thick tundra type but more you C-152
variety.
I
-> >can
-> > > see your point though, the wider the tyre the less it will dig into
the
-> > > ground, hence, less drag more speed.
-> > >
-> > > Regards,
-> > >
-> > > -> From: Bob Patterson <apat@istar.ca>
-> > > -> Subject: Re: 0-235 Nu Chrome
-> > > -> Message-Id: <E19B3pz-0003fY-00@app4.nasc.inter.net>
-> > > -> Date: Wed, 30 Apr 2003 22:30:20 -0400
-> > > ->
-> > > ->
-> > > -> If the engine is not using excessive oil, then your rings
-> > > -> have seated well on the chrome, and maybe it's not a good idea
-> > > -> to mess with it.....
-> > > ->
-> > > -> Larger valves are a "Good Thing"(tm) - again, if they're
-> > > -> working OK, don't tinker !!
-> > > ->
-> > > -> It would be good to know if the pistons were oversize
-> > > -> or standard - if standard, you shouldn't have a big problem
-> > > -> changing back, but again, please try tweaking prop settings
first.
-> > > -> Sounds like just getting another couple of hundred rpm might
-> > > -> make a BIG improvement for you !
-> > > ->
-> > > -> Another thought - get the tail up as quickly as possible
-> > > -> on takeoff, to reduce drag. I recall that my O-235 Rebel used
-> > > -> to roll about 400 ft. on grass, solo. What tures do you have ??
-> > > ->
-> > > -> .....bobp
-> >
-> >
-> >
-> >
->

*-------------------------------------------------------------------------*

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-> > To contact the list admin, e-mail mike.davis@dcsol.com
->

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-> >
-> >
-> >
->
->
-> _________________________________________________________________
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-> http://join.msn.com/?page=features/junkmail
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[klehman]

Dick
What kind of airspeeds are you getting in cruise?
thanks
Ken

Dick Kyro wrote:

Not necessarily, the Sub is a stock 2.2 listed at 130 hp. It is
turning the prop thru a Ross 2.17/1 reduction drive, so my prop speed is
relatively slow. I typically cruise at about 4600 rpm engine, which gives me
a little over 2100 prop rpm.

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