Chainsaw Repair

Also more intake open time(Duration) will help to increase "ram effect" which will occur in a race motor with enough rpm,intake duration,and large enough carb to allow it to happen. Ram effect actually supercharges the crankcase to a certain degree.
I have actually documented ram effect on a race motor by conducting vacuum and pressure tests on a running engine from idle to full throttle. My tests showed that there was constant pressure in the crankcase during ram effect,and there was no vacuum even on the piston upstroke... The fuel/air column reaches enough velocity and energy to overcome blowback from the desending piston,and rams into the crankcase.

Do these engines still require an impulse for the carb and if so how does that work out.