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10-12-2002, 08:52 PM | #1 |
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combustion chamber
Why does it seem that some set-ups work better with a smaller chamber. Could you give an example of a setup that would benefit from a 58cc combustion chamber, and a setup that would require a 64cc chamber. What is the deciding factor?
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10-12-2002, 08:58 PM | #2 |
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A small # of cc chamber makes more compression. Naturally asporated this is what you want. Nos or forced induction use the larger cc heads. If you are planning a purchase and will bolt them on a stock motor, get the 58cc, as long as you do not plan on forcing induction. For up to 150hp shot of NOS the 58cc will be OK
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10-13-2002, 04:09 PM | #3 |
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thanks, makes sense
What is the relationship of intake and exhaust port sizes to the size of the combustion chamber. What I mean is GT-40X's with a 58cc combustion chamber flow 240cfm @ .550 lift utilizing 1.94" intake and 1.54" exhaust valves. While the afr 185's with a 58cc combustion chamber flow 273cfm @ .550 lift utilizing 2.02" intake and 1.60" exhaust valves. Are the AFR 185's with a 58cc chamber overkill? Do you need valves that big with this size chamber? Better yet, what is the maximum size valves neccessary to fill a 58cc chamber on a naturally aspirated motor? Could an intake keep up (any brand)? Or is that even the point?
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10-13-2002, 04:54 PM | #4 |
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the champer CC dont afect the Flow of a head the CC of the Runners do tho.
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10-13-2002, 08:25 PM | #5 | |
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Quote:
The size of the chamber primarily effects the compression ratio. The smaller the chamber, the higher the compression ratio (that is if everything else remains the same). Sorry that was so long winded but all those things are so inner related its difficult to discuss it without writing a book! |
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