4-stroke carbon pipe design Q's

[Ron Van Putte]

On May 23, 2005, at 9:59 AM, patterndude at comcast.net wrote:

> I've gotten a lot of recomendations to add a carbon lightweight 
> 4-stroke pipe to our lineup so I'm starting to look at a 4 stroke pipe 
> design.  I have some questions:
> 1. What are the proper pipe inlet diameters that you desire on pipes
> 2. Worst reasonable case: how close is the pipe to the exhaust port
> 3. What max temperature at the inlet do you suspect (I'll be doing 
> detailed research on this but want your opinion).
> 4. Is it possible to tune a 4 stroke at all, or is the muffling the 
> only goal?  If tuning is possible, how does this work?


Regarding #1:  I think most headers for 4-stroke engines have 1/2" exit 
diameter.

Regarding #2:  I've been running an alumnium pipe with a header length 
of 7" to 8".

Regarding #3:  No clue, but I use PTFE Teflon couplers and they're 
rated at 550 degrees, I think.  I've flown the same piece of PTFE as a 
coupler for three years with a YS 1.40L, with no apparent degradation.

Regarding #4:  Muffling is the only goal.  I use 40-size muffled tuned 
pipes and get great engine performance, with quiet operation.

Ron Van Putte

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