It's really just simple math... Every two revolutions the intake must pass the displacement of the motor. Calc displacement into cubic feet (1 L = 0.0353146667 cu. ft., 1.9 L - 0.067097 cu. ft., 2.1 L = 0.074160 cu. ft.), multiply by RPM/ 2 That'll tell you how much air has to go through the intake. If you REALLY want to get into it, pick up a copy of Philip H. Smith's "The Scientific Design of Exhaust & Intake Systems." <http://www.bentleypublishers.com/product.htm?code=G309> From Bentley's website: For years, engineers, engine designers, high-performance tuners and racers have depended on this book to develop maximim potential from their engines. Dr. John C. Morrison is one of the foremost authorities on the analysis of the induction and exhaust processes of high-speed engines. Together with Philip Smith, he gives a thorough explanation of the physics that govern the behavior of gases as they pass through an engine, and the theories and practical research methods used in designing more efficient induction manifolds and exhaust systems, for both competition and street use. Another good reference work is A. Graham Bell's "Four Stroke Performance Tuning" ISBN 9781844253142 Amazon's got that one: <http://www.amazon.com/Four-Stroke-Performance-Tuning-3rd-practical/ dp/1844253147/ref=sr_11_1?ie=UTF8&qid=1217206044&sr=11-1> Both books are indispensable reference volumes. If this is your "thing" you'll find yourself referring to them again and again. Jim
On Jul 27, 2008, at 4:38 PM, John Rodgers wrote: > Volks, > > Can any of you really mechanically experienced folks give me some idea > about induction flow rates - as in air intake flow rates that go to > the > engine through the intake manifolds. What would be the volume of air > going into an engine at say, idle, cruise, top speed? Also the > speed at > which that air might be moving? This is an area about which I have no > knowledge at all and could use such for some planning purposes. > > Thanks, > > John Rodgers > 88 GL Driver |
Please note - During the past 17 years of operation, several gigabytes of
Vanagon mail messages have been archived. Searching the entire collection
will take up to five minutes to complete. Please be patient!
Return to the archives @ gerry.vanagon.com
The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.
Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.