High temps - Lycoming on Rebel

[Wayne G. O'Shea]

As my son even pointed out to me a few minutes ago.....allowing for altitude
and after a search of the lyco site

"209F if you're flying high enough to miss cell towers! Lycoming even says
220 in cruise is fine."

http://www.lycoming.textron.com/support ... peration/l
eaningEngines.html

. For engine longevity they suggest the following:
.................
8. For maximum service life, maintain the following recommended limits for
continuous cruise operation:

(a) Engine power setting - 65% of rated or less.

(b) Cylinder head temperatures - 400oF. or below.

[Neil Hardie]

Go away from the computer for 15 minutes and Wayne comes back with even
more info. Amazing. Thanks again.

Neil






-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Wayne G. O'Shea
Sent: Monday, June 06, 2005 7:22 PM
To: rebel-builders@dcsol.com
Subject: Re: High temps - Lycoming on Rebel


** Check your subject, does it still reflect the message? **

As my son even pointed out to me a few minutes ago.....allowing for
altitude and after a search of the lyco site

"209F if you're flying high enough to miss cell towers! Lycoming even
says 220 in cruise is fine."

http://www.lycoming.textron.com/support ... ts/operati
on/l
eaningEngines.html

. For engine longevity they suggest the following: ................. 8.
For maximum service life, maintain the following recommended limits for
continuous cruise operation:

(a) Engine power setting - 65% of rated or less.

(b) Cylinder head temperatures - 400oF. or below.

C Oil temperature - 165oF. - 220oF

.................
Now consider these temps are no problem if you keep below 65% power..but
who does..always around 75 or so dragging a set of floats from lake to
lake.

Wayne

----- Original Message -----
From: "Neil Hardie" <nhardie@lincsat.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, June 06, 2005 7:06 PM
Subject: RE: High temps

** Check your subject, does it still reflect the message? **

Thanks Wayne all good stuff as usual. Notice how I got this out before

you went north! You got the right Bob - I will check with him about
the Vernatherm and maybe not get so uptight about uptemp!!

Neil








-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Wayne G. O'Shea
Sent: Monday, June 06, 2005 5:41 PM
To: rebel-builders@dcsol.com
Subject: Re: High temps


** Check your subject, does it still reflect the message? **

To me 215 is perfect (but I don't get much support on that opinion
around here)! Water boils at 212! 225 in climb is getting warm, but
not uncommon or dangerous. You're right though it's only going to get
higher on a day like today or yesterday that hit 32. Your CHT's sound
good although I do shoot for 350 to 375...but will take up to 425
continuous in cruise. If I remember right Bob had a Vernatherm issue
once with it sticking open..ie when heated it didn't lengthen and plug

the hole and force oil thru the cooler...so that's another thing to
check (and I may have the person wrong,,,,but it was someone here).

Oil cooler orientation is another variable as to how well it cools as
well, and how many kinks are in the 3" scat hose getting to it. Do the

cowl bottom doors have a lip on them? If not try giving them a bend
down. Did that on mine when I had the O-235 in it with no cooler that
ran 235/245 everyday without skipping a beat. The lip dropped the
temps about 10*F

Wayne

----- Original Message -----
From: "Neil Hardie" <nhardie@lincsat.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, June 06, 2005 5:06 PM
Subject: High temps

** Check your subject, does it still reflect the message? **

My Rebel ( read Bob Johnson's original #652 ) has taken to the air
for

the first time from the water. Since we put the floats on I have had

a

problem with high oil temps. They are running as high as 225 in
climb and even at 2200 rpm cruise they are around 215. With the
floats you expect higher temps because of the lower speeds and
higher work load on the engine but these are still too high running
at 2300 rpm.OAT's were running around 24 so not really hot - yet. I
have an 0-320 H engine. All lines to the oil cooler are good. We
have checked the timing ( cause of earlier high temps) and the oil
temp guage itself. Both are fine.The CHT's are running under 400
except for #2 which is running just over 400. EGT's are all close to

1200. Most 0-320 Cessna's use a 4" hose to the cooler and GIWH has a

3". Also we may open up the bottom end of the cowling to get more
air flow. Any ideas?

Neil Hardie







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[Walter Klatt]

Good to hear about another Rebel on floats. I used to have a
problem on mine, but it was much more severe than you describe.
My solution was to open the bottom more, and a year ago I also
opened my inlets a bit, and that totally solved my problem. Now I
can cruise in the hottest weather with CHT's below 400 and no
more step climbing to stay below 450. I never did have a problem
with oil temps as my cooler is mounted on the rear right baffle.

But in your case, Neil, sounds like you are just a tad high with
both oil and CHT's so maybe just opening the bottom cowl a bit
and adding that lip there, will fix both for you. The other thing
some people have done is faired the lower firewall flange which
helped too. On my old cowl (before opening the inlets), I also
riveted on a lexan eyebrow on the left inlet, and that seemed to
help as well.

Walter

[quote]-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Monday, June 06, 2005 4:22 PM
To: rebel-builders@dcsol.com
Subject: Re: High temps - Lycoming on Rebel


** Check your subject, does it still reflect the message? **

As my son even pointed out to me a few minutes
ago.....allowing for altitude
and after a search of the lyco site

"209F if you're flying high enough to miss cell
towers! Lycoming even says
220 in cruise is fine."

http://www.lycoming.textron.com/support/publications/ke
yReprints/operation/l
eaningEngines.html

. For engine longevity they suggest the following:
.................
8. For maximum service life, maintain the following
recommended limits for
continuous cruise operation:

(a) Engine power setting - 65% of rated or less.

(b) Cylinder head temperatures - 400oF. or below.

[Wayne G. O'Shea]

Yah, I do need to get a life!!! Working on it come Sunday!! LOL ! )

Wayne

----- Original Message -----
From: "Neil Hardie" <nhardie@lincsat.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, June 06, 2005 7:56 PM
Subject: RE: High temps - Lycoming on Rebel

** Check your subject, does it still reflect the message? **

Go away from the computer for 15 minutes and Wayne comes back with even
more info. Amazing. Thanks again.

Neil

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