REFLECTOR: IO 360 exhaust

[Ron Brown]

My IO360 on a 173 Elite RG is equipped with the forward exiting 2 into 1 
stainless steel exhausts.

I left my cowl openings around the exhaust fairly large - one inch 
clearance - so that I could get more air to the front to the engine and keep 
electronics, vacuum pump and mags cooler.  Works!  I have placed a 
temperature sensor near the vacuum pump and only recorded 180 or so degrees 
during cruise.  My heads run 320-360 depending if I am cruising, how LOP I 
am running, or if I am in a long climb.  My oil temps run 185 in the winter 
and 210 in the summer.  I did have one recent experience on a 95 degree day, 
after taking Terry Miles up for a few circuit around the pattern, dropping 
him off, and then getting stuck at the hold short position for about 15 
minutes while a military plane landed, and another took off.  When it was my 
turn, my oil temp went to 225 on climb out.  I had to keep the nose down and 
reduced power while the engine cooled off. It was fine after about 10 
minutes, then I climbed on up to 5500 for the trip home.

Ronnie

----- Original Message ----- 
From: "Tom" <tomcat05 at comcast.net>
To: <reflector at tvbf.org>
Sent: Monday, September 17, 2007 4:02 PM
Subject: REFLECTOR: IO 360 exhaust


> Looking into exhaust systems (O360). Currently have a 4 into 1 mild
> steel that exists on left side of cowl (forward) and needs replacement.
> I like the simplicity of having 2 into 1 (ss) on each side but I'm not
> sure what impact a 2nd hole in cowling might have on airflow, temps or
> cruise. Opinions appreciated...thx Tom
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