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Old 11-13-2006, 21:53   #1 (permalink)
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Open or closed chamber? What is the difference?

Hi Guys, What are open and closed chamber heads? What are the physical differences between the two and which are the better sort?
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Old 11-17-2006, 22:58   #2 (permalink)
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Re: Open or closed chamber? What is the difference?

the recess in the bottom of the head in which the valves sit in is the combustion chamber. Open chamber is a low compression head and so when the piston is at tdc there is a larger gap remaining than with the closed chamber. Closed will be nearly flat accross the bottom thus causing Higher compression. So best depends on the motor and what compression ratio your trying to acheive.
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Old 11-18-2006, 20:21   #3 (permalink)
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Re: Open or closed chamber? What is the difference?

Thanks for that explanation, much appreciated!
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