I was up all night brainstorming. I was trying to think of a way to to apply forced air induction on one of these little bike engines.
The idea came along to use an air motor.. You know, the kind typically used to run an air tool in your garage. What if one was to run the air motor backwards, say by chain driving (or gear driving) what would normally be the output shaft and using the air input/output as the inlet and outlet for the forced air induction. The effect would basically be like a miniature roots type supercharger.
http://www.tpub.com/content/engine/14105/img/14105_161_1.jpg
The inlet, you'd attach the carb to, which coincidentally would also serve to lube the air motor blades using the 2 stroke oil. The outlet would then be plumbed to the intake of the engine. The shaft, which would normally be driven by the compressed air would actually be driven from the crank of the engine. Mabye need a 2:1 ratio to get the compression at the outlet. All it would take is 3-4 psi boost to get a noticeable gain in power output.
Another link on the operation of an air-motor:
http://www.tpub.com/content/engine/14105/css/14105_161.htm
I may take apart one of my junk air tools to see if it might be useable in such a manner.
With 2 stroke engines, the only big problem I could think of is that if both the intake and exhaust ports are exposed by the piston, any pressure built would just blow the intake charge right out the exhaust port. This might require a higher intake pressure. I'd imagine that the effects of the pressurized crankcase would become more apparent at higher rpms, as the exposure times of the ports would be much smaller duration...
Any ideas? Opinions?
The idea came along to use an air motor.. You know, the kind typically used to run an air tool in your garage. What if one was to run the air motor backwards, say by chain driving (or gear driving) what would normally be the output shaft and using the air input/output as the inlet and outlet for the forced air induction. The effect would basically be like a miniature roots type supercharger.
http://www.tpub.com/content/engine/14105/img/14105_161_1.jpg
The inlet, you'd attach the carb to, which coincidentally would also serve to lube the air motor blades using the 2 stroke oil. The outlet would then be plumbed to the intake of the engine. The shaft, which would normally be driven by the compressed air would actually be driven from the crank of the engine. Mabye need a 2:1 ratio to get the compression at the outlet. All it would take is 3-4 psi boost to get a noticeable gain in power output.
Another link on the operation of an air-motor:
http://www.tpub.com/content/engine/14105/css/14105_161.htm
I may take apart one of my junk air tools to see if it might be useable in such a manner.
With 2 stroke engines, the only big problem I could think of is that if both the intake and exhaust ports are exposed by the piston, any pressure built would just blow the intake charge right out the exhaust port. This might require a higher intake pressure. I'd imagine that the effects of the pressurized crankcase would become more apparent at higher rpms, as the exposure times of the ports would be much smaller duration...
Any ideas? Opinions?
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