Cooling

Dick Shotwell · Post by **Dick Shotwell** » Sat Feb 18, 2012 9:09 am

Hi Steve,
I've got about 40 photos. It might be better if I sent you a CD. Let me
know.
Dick Shotwell
Moose 096

----- Original Message -----
From: <steve.h@dcsol.com>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, March 30, 2004 7:52 AM
Subject: Re: Cooling

Can you post your photos to the list??
Will be starting our cowl install shortly.
Thanks

Steve H
Moose 213

On 3/30/2004 5:50 AM, DICKS@PMT.ORG wrote to MURPHY-REBEL:

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-> Message-ID: <001001c41611$65ecf660$c14c53d8@dicks>
-> From: "Dick Shotwell" <dicks@pmt.org>
-> To: <murphy-rebel@dcsol.com>
-> References: <12f.3e0d5431.2d9a493c@aol.com>
-> Subject: Re: Cooling
-> Date: Mon, 29 Mar 2004 21:34:46 -0700
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-> Thanks Kevin. I'll keep you posted.
-> Dick
-> ----- Original Message -----
-> From: <KJKimball@aol.com>
-> To: <murphy-rebel@dcsol.com>
-> Sent: Monday, March 29, 2004 20:53 PM
-> Subject: Re: Cooling
->
->
-> > Dick,
-> >
-> > I have looked at your photos and I tell ya, I cannot see an easy way

to

-> > improve the flow in your engine compartment. Keep me posted on what

you

-> hear from
-> > others.
-> >
-> > Sincerely,
-> >
-> > Kevin Kimball, VP Engineering
-> > Jim Kimball Enterprises, Inc.
-> > PO Box 849, 5354 Cemetery Rd.
-> > Zellwood, FL 32798
-> > 407-889-3451 phone
-> > 407-889-7168 fax
-> > www.jimkimballenterprises.com
-> > www.pittsmodel12.com
-> >
-> >
-> >
-> >
->

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Scott & Leere' Aldrich · Post by **Scott & Leere' Aldrich** » Sat Feb 18, 2012 9:09 am

Dick, Congratulations on the first flights. You guys have the front
louvers right? (Wasn't that yours on the front page of the MAM site until
today?) I haven't seen anyone else flying with them yet. Do you have the
Murphy cowl flap too?

Curious exactly what CHT and oil temps you are getting?

Scott
Moose #174

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Walter Klatt · Post by **Walter Klatt** » Sat Feb 18, 2012 10:43 am

Yes, Gary, I did have cooling problems initially on mine with the
speed cowl and when I went on amphibs. I first played around with
the bottom outlets, and finally got it marginally acceptable
after about the 4th iteration.

Then I opened up my inlets on the top cowl, and that was what
really fixed my cooling problems for good. If you look closely at
the pic (click a couple of times to get the highest resolution),
you will see that my inlets are shaped a little differently than
the stock version. Now I can climb from sea level in 35C+ (95F+)
outside temps straight up to 10,000 feet if I have to get over
some mountain. Previously, I had to back off when the CHT's hit
450, and step climb. Cruise in the hottest weather now stays
under 400 (normal is 350 - 375) where previously, would be as
high 435 in real hot weather. I never did have oil cooling
problems (cooler mounted on rear baffle), and even now in the
summer, I need to partially block my oil cooler to get my oil
temps up.

When I get some time, maybe this winter, I am going to reshape
the bottom cowl again. I don't think I need that big opening
anymore, now that I have the bigger inlets.

There has been lots of discussion in the archives about cooling.
There are quite a few other things that need to be done also to
improve cooling.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Gary Gustafson
Sent: Monday, July 11, 2005 3:34 AM
To: rebel-builders@dcsol.com
Subject: RE: Arlington 2005

Walter
I note on your amphib Rebel the very large exhaust
duct on the bottom of the
cowling. I am in the final stages of fitting my
cowling on my Rebel with a
O-320 (160 hp) engine so I have to ask. Did you have
cooling problems
initially? My exhaust area is nowhere as large as that
on your plane appears
to be. Would you care to explain why the need for such
a large area?

Thanking you in advance. Sure hope that I do not have
to rework the cowling
some more.

Gary Gustafson #242

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com] On Behalf Of Walter
Klatt
Sent: Sunday, July 10, 2005 12:11 PM
To: Rebel-Builders
Subject: Arlington 2005

I made it down to Arlington yesterday, and here are a
few pics of
the Murphy planes I saw there.
http://www.grovestreet.com/jsp/userview.jsp?username=Wa

lterKlatt

Walter

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Bruce Georgen · Post by **Bruce Georgen** » Sat Feb 18, 2012 10:43 am

Walter really nailed the cooling thing on his Rebel. We fly the same planes only mine has the stock cowl not modified and last summer Walter blew me away on those long hot climbs. I was having to step climb after my cylinder heads hit 450 F. I I did it again I would go with one of those clone 360's and make my cowl inlets bigger.

Bruce

-----Original Message-----
From: Walter Klatt <Walter.Klatt@shaw.ca>
Sent: Jul 11, 2005 2:22 PM
To: rebel-builders@dcsol.com
Subject: Cooling

Yes, Gary, I did have cooling problems initially on mine with the
speed cowl and when I went on amphibs. I first played around with
the bottom outlets, and finally got it marginally acceptable
after about the 4th iteration.

Then I opened up my inlets on the top cowl, and that was what
really fixed my cooling problems for good. If you look closely at
the pic (click a couple of times to get the highest resolution),
you will see that my inlets are shaped a little differently than
the stock version. Now I can climb from sea level in 35C+ (95F+)
outside temps straight up to 10,000 feet if I have to get over
some mountain. Previously, I had to back off when the CHT's hit
450, and step climb. Cruise in the hottest weather now stays
under 400 (normal is 350 - 375) where previously, would be as
high 435 in real hot weather. I never did have oil cooling
problems (cooler mounted on rear baffle), and even now in the
summer, I need to partially block my oil cooler to get my oil
temps up.

When I get some time, maybe this winter, I am going to reshape
the bottom cowl again. I don't think I need that big opening
anymore, now that I have the bigger inlets.

There has been lots of discussion in the archives about cooling.
There are quite a few other things that need to be done also to
improve cooling.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Gary Gustafson
Sent: Monday, July 11, 2005 3:34 AM
To: rebel-builders@dcsol.com
Subject: RE: Arlington 2005

Walter
I note on your amphib Rebel the very large exhaust
duct on the bottom of the
cowling. I am in the final stages of fitting my
cowling on my Rebel with a
O-320 (160 hp) engine so I have to ask. Did you have
cooling problems
initially? My exhaust area is nowhere as large as that
on your plane appears
to be. Would you care to explain why the need for such
a large area?

Thanking you in advance. Sure hope that I do not have
to rework the cowling
some more.

Gary Gustafson #242

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com] On Behalf Of Walter
Klatt
Sent: Sunday, July 10, 2005 12:11 PM
To: Rebel-Builders
Subject: Arlington 2005

I made it down to Arlington yesterday, and here are a
few pics of
the Murphy planes I saw there.
http://www.grovestreet.com/jsp/userview.jsp?username=Wa

lterKlatt

Walter

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carol and murray cherkas · Post by **carol and murray cherkas** » Sat Feb 18, 2012 10:43 am

Gentlemen

For the record.
I have a Thorp T 18 nosebowl, a 7 chamber stewart warner oil cooler mounted
on the firewall, 3" scatt tube, the bottom of cowl at the exit is flared
down, 3 1/2" stand off on the bottom of fuse to top of cowling. Granted I am
on wheels but at 32* my oil temp might hit 205*, my CHT 375*.

Murray

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Walter Klatt · Post by **Walter Klatt** » Sat Feb 18, 2012 10:43 am

Murray, cooling on floats is a whole different story than on
wheels if you have the speed cowling. I was fine on wheels, too,
but not on floats, if I didn't want to step climb.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
carol and murray cherkas
Sent: Tuesday, July 12, 2005 8:28 PM
To: rebel-builders@dcsol.com
Subject: Re: Cooling

Gentlemen

For the record.
I have a Thorp T 18 nosebowl, a 7 chamber stewart
warner oil cooler mounted
on the firewall, 3" scatt tube, the bottom of cowl at
the exit is flared
down, 3 1/2" stand off on the bottom of fuse to top of
cowling. Granted I am
on wheels but at 32* my oil temp might hit 205*, my CHT 375*.

Murray

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carol and murray cherkas · Post by **carol and murray cherkas** » Sat Feb 18, 2012 10:43 am

Walter

Just FYI.
No I don't have the speed cowl. I built a 4 door one.

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Wayne G. O'Shea · Post by **Wayne G. O'Shea** » Sat Feb 18, 2012 10:47 am

Well.....I've seen the difference now on my well tested and flown machine
(10 years on wheels!). On wheels my oil temps reach about 225F most of the
summer which concerns me absolutely none... with no significant oil useage
and 75PSI pressure and the guarantee I have no moisture staying in my
engine. Cylinder temps NEVER over 375F

First flights on amphibs saw my oil temps hit 245F(almost hitting 250) and I
punched at least one cylinder to 500 (melted the tin tape I had over a
baffle crack.). Also consider it was 33*C or so on the first few flights. I
opened my lower outlet somewhat by making some nice curved cuts into my
lower door rear edges from the center hinge area right over to the bottom of
the corner wrap. This brought my cylinder temps down to 330 on the lowest
and 420 on the highest which is just fine with me. Hard to make them go over
450 even in a long climb and I've been flying on 37*C days around Temagami.
When leaned out the oil temp is still hitting 237F unless I run full rich
and then I can get it backdown to 230 when running at 2500RPMs. It's going
to do for the rest of the summer, but when I find some down time I will be
swapping out my cooler for a 20003 instead of the 20002 size that I have on
there.

Cheers,
Wayne

----- Original Message -----
From: "Walter Klatt" <Walter.Klatt@shaw.ca>
To: <rebel-builders@dcsol.com>
Sent: Wednesday, July 13, 2005 2:11 AM
Subject: RE: Cooling

Murray, cooling on floats is a whole different story than on
wheels if you have the speed cowling. I was fine on wheels, too,
but not on floats, if I didn't want to step climb.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
carol and murray cherkas
Sent: Tuesday, July 12, 2005 8:28 PM
To: rebel-builders@dcsol.com
Subject: Re: Cooling

Gentlemen

For the record.
I have a Thorp T 18 nosebowl, a 7 chamber stewart
warner oil cooler mounted
on the firewall, 3" scatt tube, the bottom of cowl at
the exit is flared
down, 3 1/2" stand off on the bottom of fuse to top of
cowling. Granted I am
on wheels but at 32* my oil temp might hit 205*, my CHT 375*.

Murray

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