wireman wrote:
heres that carb formula i was talking about for figuring cfm !rpm x displacement x .85(efficiency 85%) divided by 3,456 =cfm requirement ,now can one of you mathematician types with the sliderules built into your glasses figure out how to convert this from inches and cfm to centimeters and mms? goodluck,happy wrenching!
Post edited by: wireman, at: 2006/01/16 00:21<br><br>Post edited by: wireman, at: 2006/01/16 00:22
What are motorcycle carb flow rates measured in?
Your formula to calculate CFM using CC for displacement would just be:
RPM * displacement * .6102 * 0.85 / 3,456
So for a 650 at 9,000 RPM that's:
9,000 * 650 * .6102 * 0.85 / 3,456 = 87.08 CFM
The .6102 comes from converting from cubic centimeters to liters (1,000 cc = 1 L) and from liters to cubic inches (1 L = 61.02 ci).
Do bike carb makers publish flow rates? What units do they use?