REFLECTOR: IO-360 exhaust

[Richard J. Gentil]

Doug,

When I was picking the exhaust for my IO-390X I did some asking around, 
the 2 into 1 stacks that exit though the lower cowl do not show any 
difference in speed vs two stacks exiting the rear of the cowl.

So there is no speed advantage in the rear exiting. Another thing, the 
exhaust out the rear means a lot more cleaning of your prop and if you 
have one with a spring system, you can expect a high chance of things 
breaking off and going through your prop.

With the Angle Valve 390 I had to have Velocity modify the exhaust 
stacks and I still needed to glass in the Velocity provided Blister in 
the lower cowl. Actually, the blister was not large enough and I had to 
make it larger to fix the exhaust on the #1 Cyl.

Richard

Douglas Holub wrote:
> Super. Thanks.
>
> Doug
> ----- Original Message ----- 
> From: "Tom" <tomcat05 at comcast.net>
> To: <reflector at tvbf.org>
> Sent: Wednesday, January 09, 2008 6:14 PM
> Subject: REFLECTOR: IO-360 exhaust
>
>
>   
>> Doug, I just bought the ones showing in the Velocity store. They are 2
>> two into one pipes, you'll need two holes in cowling. They are .049
>> stainless and are nicely done I guess my cowling wasn't stock because I
>> needed to glass in a fairly large blister near the number one cylinder
>> to accomodate the new pipes. I had a 4 into 1 prior to this that was
>> mild steel with no slip joints and had cracked itself to death. The good
>> news is that I gained 100 rpm (fixed pitch) in static rpm. One other
>> thing to consider is that they haven't adjusted the prices on the
>> Velocity store on line in a while, actual price is about 60 bucks higher
>> than shown. Tom
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