Measduring pipe length

[Carl Van Houten]

Jim,

Isn't the tuned length from the face of the piston to the start of the stinger?

Probably a much better and more accurate measurement?

This is how we are measuring pipes now. We found out that this way helped

us make more power and RPM with a certain 21-Hydro pipe.

We were way too short with the older way of measuring.

Thanks For Reading,

Mark Sholund

The most accurate measurement would be from the piston face in the exhaust window to the middle of the "entire baffle cone length"; where it comes to a point. Two pipes that appear to be exactly the same can have very different tuned lengths when the total included angle of the baffle cone is considered.

Jim Allen

Nice pipes Jim.

 

[Jim Allen]

Thanks Carl,

The latest pipe for a 27 cc to 30 cc gas engine has no straight areas in the header section. They are machined to fit directly into the shortened, modified QD header & this is where the diffusers taper begins. The engine runs cooler but makes more HP because the stinger is now 6.000" long X .4062" ID. I believe I could probably reduce the stinger ID down to .3750 & still keep the engines head temperature below 200* F at WOT. The engine also has a very high compression ratio. I haven't tested this as yet on the .95 nitro engine, but the improvement should be the same.

JA