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Eric Gorr is famous for being an expert in 2 stroke posting. In his book he listed these guidelines:
top end power: 84 degree ATDC exhaust, 116* ATDC transfers, 40% of head diameter squished, 105 octane gas
midrange power: 90degree ATDC exhaust, 118* ATDC transfers, 60% of head diameter squished, 93 octane
So from that I could derive that porting for an engine with low rpm power such as these chinese 48cc engines would be 96 degree ATDC exhaust, 120* ATDC transfers, 80% of head diameter squished, 90 octane gas
So I want to try that on my engine but first I need to know the connecting rod eye-to-eye length so I can calculate where the ports should begin to open in distance from piston TDC.
Can anyone tell me this distance?
top end power: 84 degree ATDC exhaust, 116* ATDC transfers, 40% of head diameter squished, 105 octane gas
midrange power: 90degree ATDC exhaust, 118* ATDC transfers, 60% of head diameter squished, 93 octane
So from that I could derive that porting for an engine with low rpm power such as these chinese 48cc engines would be 96 degree ATDC exhaust, 120* ATDC transfers, 80% of head diameter squished, 90 octane gas
So I want to try that on my engine but first I need to know the connecting rod eye-to-eye length so I can calculate where the ports should begin to open in distance from piston TDC.
Can anyone tell me this distance?