View single post by Doug Tenney
 Posted: Mon Jun 5th, 2017 03:48 pm
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Doug Tenney

 

Joined: Sat Apr 29th, 2017
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 Howard,
Those grooves connect to the crankcase via holes added to the side of the piston.  They're called "Boost Ports."

They're basically a method to add more transfer ports.

Doug
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