Quote:
Originally Posted by LukeL
You are the gas expert, not me, so explain this to me if needed, but I thought the crank seals were in place to cause vacuum in the crankcase under the piston to make vacuum for the fuel pump... if that’s the case, they shouldn’t affect vacuum for the carb, as that’s above the cylinder?
I know with both of the 3PGs I had changing the crankshaft seals didn’t affect compression or carb suction.
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I can explain this a little bit.
There is a port in the side of the piston. It allows the fuel/oil/air mixture to travel under the piston, through the lower end to lubricate the bearings, and then through another passage on the other side of the cylinder that leads to the top side of the piston for combustion.
That's why the crank seals are so important. Everything needs to be airtight for the proper suction to happen.