Combustion chamber size
09-17-2007, 06:27 PM
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Combustion chamber size I was wondering how CC size affects power output. Is a larger cc better for larger displacement engines or do you want a smaller cc?
I question this because I am considering my ported LS6 heads on a LSX build.
They flow 320 cfm at .600 lift with a 64cc size and 227cc intake runners.
They only added 12 hp to my current build. My thought is because they flow too well for my engine output, and the valves being too large for my 346 displacement.
What do you guys think?
I question this because I am considering my ported LS6 heads on a LSX build.
They flow 320 cfm at .600 lift with a 64cc size and 227cc intake runners.
They only added 12 hp to my current build. My thought is because they flow too well for my engine output, and the valves being too large for my 346 displacement.
What do you guys think?
09-17-2007, 09:10 PM
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A lower combustion chamber size will result in more compression which means more hp and torque but less ptv clearance from milling.
I remember a post by Patrick G where he gained more hp and torque across the entire power band with the smaller 205cc intake runner and little if any in the upper rpm's with the larger 225cc intake runner on a 346ci engine.
The 227cc intake runner on your head would be better suited for big cubes.
I remember a post by Patrick G where he gained more hp and torque across the entire power band with the smaller 205cc intake runner and little if any in the upper rpm's with the larger 225cc intake runner on a 346ci engine.
The 227cc intake runner on your head would be better suited for big cubes.