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#11
04-29-2014, 06:41 PM
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2 strokes are very sensitive to any exhaust change. putting a longer head pipe before the expansion chamber adds torque , shorten it and it gets more peaky. even silencers make a huge change in a 2 stroke, anyway enough about 2 strokes.
I believe that while the pipe becomes smaller the velocity of the gas's leaving are increased and during the cam overlap it helps empty and fill the cylinder better , fill the cylinder better and increase the running compression , higher compression = higher torque. most people are familiar with compression during cranking. there's no way of actually knowing running compression unless you can monitor the air going into and out of the motor. We all think of filling the cylinder is done on the down stroke of the piston. but during that short time of valve overlap the exhaust is actually helping suck air/fuel mix in. I just thought I'd throw this out there as an example so people can better understand how an exhaust can help or hurt you and on a little single or twin it can make decent increase's heat wrapping the pipe or heat coating also increase's velocity of the exhaust. mickb72; the 3 stage pipe you have should probably stay in the shed it could have a cool factor hanging on the wall. just so you know that there were also fuel mixture and timing changes tried while messing with the pipes. some pipe changes required fattening up the fuel mix and some required leaning it out. in the end I was able to get around 28 degrees of ign timing on premium unleaded pump gas with the head with a plug over the exhaust valve . It'll be headed for the track to see how it stacks up, customer is happy with the gains considering its twice the hp his old worn out 12 had. I used a stock head gasket but shaved the head .030 and decked the block .010. there's still enough room above the valves to go to a thin copper head gasket around .030, I should have put some playdough on top of the valves with no gasket to see how much room was really there. could maybe get away with no gasket like our pro/super motors There is not a right tube diameter or length. It all depends on the application 
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