The Murphy Builders Site

Good to hear that helped. But I still say you will have
to open the bottom more again once you are floats, if
you are still seeing 400 on wheels.

Whether you like it or not, pretty soon you will have
it looking like mine... :>)

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Legeorgen@aol.com
Sent: Sunday, September 28, 2003 7:28 PM
To: murphy-rebel@dcsol.com
Subject: Re:CHT Temps


I have a speed cowl on Rebel N96HG with an
0320. I installed a forward engine
baffle (the one MAM doesn't include in their
manual) like the Van's guys do
on their planes and I was able to bring my
CHT's down 15* F. I can now cruise
at 75% (it was 80* F today) power and keep
my hottest CHT at 400* F or less.

This will be a big help when I install the
Amphibs this winter. For all you
builders out there installing the Speed cowl
with 0320 or 0360's I would fit a
forward engine baffle now and get it over
with. Most...all, Speed cowl and
Lycoming installs I'm aware of have some
kind of high CHT problems.

Lycoming recommends keeping CHT's below 400*
F at 75% or less and at 435* F
or less at continues max power. this still
seems hot to me but I know some guys
that run with CHT's this high and don't seem
to have any ill effects. And
Lycoming says it's OK. Soooooo?

Bruce 357



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I have a speed cowl on Rebel N96HG with an 0320. I installed a forward engine
baffle (the one MAM doesn't include in their manual) like the Van's guys do
on their planes and I was able to bring my CHT's down 15* F. I can now cruise
at 75% (it was 80* F today) power and keep my hottest CHT at 400* F or less.

This will be a big help when I install the Amphibs this winter. For all you
builders out there installing the Speed cowl with 0320 or 0360's I would fit a
forward engine baffle now and get it over with. Most...all, Speed cowl and
Lycoming installs I'm aware of have some kind of high CHT problems.

Lycoming recommends keeping CHT's below 400* F at 75% or less and at 435* F
or less at continues max power. this still seems hot to me but I know some guys
that run with CHT's this high and don't seem to have any ill effects. And
Lycoming says it's OK. Soooooo?

Bruce 357



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I hear you Walter and your probably right. I don't have a problem creating a
bigger exit but with the set up I have, I already have a large exit cut out
from the fiberglass and closed up again with an aluminum cowl flap.

When I determine where I want to fix the flap permanent I will do that after
experimenting with the Floats on. I was going to make it a real adjustable
cowl flap but decided It was better to save the 5 lb. of cable, as I don't think
it needs to be that sophisticated.

Bruce 357R



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Bruce,
When I saw the front baffle on some RV's I thought about how much sense it
was to put that in. Could you post some pictures of your front baffle
installation? I am already installing a front baffle on my O-320 Rebel.
Rick D.

Quoting Legeorgen@aol.com:

I have a speed cowl on Rebel N96HG with an 0320. I installed a forward engine

baffle (the one MAM doesn't include in their manual) like the Van's guys do
on their planes and I was able to bring my CHT's down 15* F. I can now cruise

at 75% (it was 80* F today) power and keep my hottest CHT at 400* F or less.

This will be a big help when I install the Amphibs this winter. For all you
builders out there installing the Speed cowl with 0320 or 0360's I would fit
a
forward engine baffle now and get it over with. Most...all, Speed cowl and
Lycoming installs I'm aware of have some kind of high CHT problems.

Lycoming recommends keeping CHT's below 400* F at 75% or less and at 435* F
or less at continues max power. this still seems hot to me but I know some
guys
that run with CHT's this high and don't seem to have any ill effects. And
Lycoming says it's OK. Soooooo?

Bruce 357



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Hi Rick,

I'll take a few pics of the forward engine baffle this weekend, along with
the hinged doors I made for the speed cowl, and post them to the sight.

Bruce 357R



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