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Are you referring to combustion chamber volume or port volume?

July 8 2008 at 12:08 PM
  (Login blykins)
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Response to ford 427 tunnle port cc

It would really have to depend on the rest of your engine combination as to whether it would be a good scenario or a bad scenario. Of course chamber size affects your compression ratio, along with piston shapes, deck heights, head gaskets, etc.

Port volume also affects the engine combination extensively. If you have a small displacement engine with a small cam, dual plane intake, etc., then a large volume is going to adversely affect the performance. That large volume of air has a momentum and velocity...it's harder to get a large amount of air moving in a short amount of time. A tunnel port head on a small displacement engine, IMO, would be better suited for higher rpm operation.

For a given combination, I try to maximize flow while keeping port volume lower.


    
This message has been edited by blykins on Jul 8, 2008 12:13 PM
This message has been edited by blykins on Jul 8, 2008 12:12 PM


 
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