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Old 08-10-2013, 07:21 PM
Nashville Kat's Avatar
Nashville Kat Nashville Kat is offline
Motorized Bicycle Elite Member
Join Date: Apr 2009
Location: Jacksonville, Florida
Posts: 1,403
Default Re: Anyone ever tried putting a pool of oil in the bottom of a China Girl crankcase?

I've been sitting here with a jug and an old piston in my hand-

yes, your comments are right, and the flaw in my own thinking was that the top of the piston cleared the intake port- but it never does-

yes, all of the intake is drawn in a roundabout way through the slots at the bottom of the piston and not at the top- the bottom of the piston clears the intake port, but the side slots in the bottom of the piston clear the side ports only at the very top of the piston stroke.

It appears that the piston never really clears the exhaust port at any time, top or bottom, so that all of the exhaust exits through a side port and then goes to the exhaust port through the jug.

Last edited by Nashville Kat; 08-10-2013 at 07:24 PM.
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