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> > I have a calculation page at > http://www.ucalgary.ca/~csimpson/Tech/Calculations.html that does this > for you. <- shameless plug Shame - shame! LOL. I have a simple spreadsheet with all kinds of calculations; cubic inches, liters, rear gear/tire diameter/mph, torque to hp, A/N fittings, carb requirements, hp required, electrical stuff...every time I find some calculation I need I add it. Great time saver. > > A 396 cubic inch engine running at 6,000 rpm should require 396 * 6,000 > / 2 or 1,188,000 cubic inches of air per minute. Where a cubic foot is > 12 * 12 * 12 or 1,728 cubic inches 1,188,000 ci/m would be 687 cubic > feet per minute. Compare that to your carburetor size. Interesting. I found a formula (probably from an old car mag) that gives the same results. They did say however that no internal combustion engine will ever achieve 100% volumetric efficiency (VE) - as I'm sure we'd all agree. They plug in a factor of 0.85 for a maximum, realistic VE. This brings the 396 down to "requiring" only 585 CFM to get the job done. I've always wondered why a 750 or 850 or whatever always seemed to run better though. Probably has a lot to do with physics and, come to think of it, don't really care that much :*) Good topic for bench racing though. Dale ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
