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Five Port?

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searcher
Senior Member
Username: searcher

Post Number: 390
Registered: 10-2004
Posted on Monday, December 07, 2009 - 09:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I was just getting some understanding of two port and three port engines, now this five port shows up. How did that work?

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gregoryan
Advanced Member
Username: gregoryan

Post Number: 49
Registered: 09-2004


Posted on Monday, December 07, 2009 - 11:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

just write to them for the catalogue offered!
heh heh
maybe they're just adding the amount of transfer ducts, or port windows, rather than piston covered port designations???
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ernie
Senior Member
Username: ernie

Post Number: 1126
Registered: 01-2002


Posted on Tuesday, December 08, 2009 - 08:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Most likely a 2-3 port engine.
Erd and Acadia except the 3hp Acadia and some others. And Oh yea Yamaha motorcycles in the 70s. They called it "torque induction"
These engines have 2 passages from the carb to the crankcase. 1 uses a check valve to seal the crankcase on the down stroke of the piston 2 port and one uses the piston skirt to close the intake passage 3 port.
Hence the 5 port designation 2 port plus 3 port
Maybe.....

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