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Post by iowahawks22 on Aug 24, 2013 0:39:59 GMT -5
I always went by this.
Take your cubic inches of motor and multiply your desired engine rpm you run then divide that by 3456. That will give you a general idea of how big of cfm carb you need.
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dm440c
Feature Winner
derby drivers against drama- there's no crying in demo derby!
Posts: 2,824
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Post by dm440c on Aug 26, 2013 12:25:24 GMT -5
you're on the right page of the book but I would assert that "target RPM" is not a derby term, because declaring a "target RPM" means that you have a single mark for RPM that you are trying to optimize your entire drivetrain to- every aspect of the engine build including induction, pistons, heads, exhaust, transmission, on and on would be optimized for this target. This is what a smart car builder does for a race car but other than a very small percentage of guys this just doesn't apply to demo derby. Which brings me back to my original assertion that guys are way over-thinking their carburetor choices when they should be spending that mental energy on learning how to tune it properly.
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Post by fordpower111 on Aug 26, 2013 15:46:33 GMT -5
^ learning how to tune it properly.
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