West Bend 820 porting question - General - General

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Howard Davis

Joined:	Mon Mar 27th, 2017
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Mana:

Here is a picture of a West Bend 820 ( that I was told, was ported by Dave Bonbright). Could someone educate me .In the picture on the inside of the cylinder there is some port work that doesn't appear to be complete ).What is its purpose ?

Attachment: IMG_2830.JPG (Downloaded 131 times)

Doug Tenney

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Mana:

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

Doug Tenney

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Mana:

Check out:

http://www.modelenginenews.org/design/boost_ports.html

Howard Davis

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Mana:

Thanks Doug for the explanation and the article.