How to know which pipe to use.

[Ron Van Putte]

Gabriel Gonzalez wrote:

>  I got a 7.5cc Macs quiet pipe for my 140FZ, but I'm not sure if it's the right thing to use.
>
>  How can it be determined what would be a good pipe to use with a 4c engine?
>
>  7.5cc seem awfully small, but in an earlier post I saw someone using a 3.5cc pipe!!!! Was this a typo?
>
>  I don't want to ruin my engine or my plane, and thought to ask before trying it.
>  
>

I've been using 6.5 and 7.5 cc Macs Quiet pipes on YS 1.20s and 1.40s 
for years.  On my 11 lb Advantage I have a 7.5 cc Macs Quiet pipe on a 
YS 1.40L and it has almost unlimited vertical on Cool Power 25% Pro 
Pattern fuel.  Some people say you should use bigger pipes and that may 
be fine for them, but I don't and have all the power I need.

Ron Van Putte


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