Greetings . . .

As you probably already know, 2 cycle engines are an entirely different 'souping' game than Otto cycle engines. Since you are tearing it all down and looking to get 'creative' you might want to see if anyone out there has tried (on your Subie engine) the killer 'trick' used extensively in the model airplane and dirt bike world - Schnuerle porting.

As in the 4 cycle world, volumetric efficiency is also a problem in the 2 cycle engine. At higher RPMs the exhaust gas tends to mix with the intake mixture - the result is dilution. Schnuerle porting uses the inertia of the incoming intake charge to continue to push the exhaust gases out - even after the piston face has covered the main exhaust port. Scavenging in reverse to us Otto cycle types.

The challenge will be to find someone who has done some solid engineering on your particular power plant. I say this because many an old-time model airplane builder has taken a Dremel tool to the exhaust ports of an older Enya, OS Max or Super Tigre power power plant - only to make matters worse.

Good luck. Sounds like a fun and unusual project. Nothing like standing out at the show or cruise night.

regards,
stock49

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