Math Formula Support Page How to reach our numbers! Home Links Project Goal Issues needing resolution O2 Sensor Theory Combustion Dynamics Detonation Effects Supporting Math Progress Report Testing Procedures Political Rant Click images for larger Fan Shroud Beginning of engine stand Stock ignition w/marks Valve lapping with hot glue preheat bolt and valve with propane torch, use tubing and drill after cooled. If you find any mistakes here, please let us know. Engine air intake Flow meter Supporting Math 1. piston displacement = pie*r*r*h = 3.14*1.5*1.5*2 = 14.1 cubic-inch per piston 2. 4-stroke engine intake cu-ft/min = cid*3000/12/12/12/2 = 28.2*3000/12/12/12/2 = 24.479 cubic-feet per minute. With breathing effeciency of 85%, 0.85*24.479 = 20.80 cu-ft/min 3. one-inch diameter intake port has (3.14*.5*.5)/12/12 = 0.005451 sq/ft of area. 4. flow cu-ft/sec-cube = area sq-ft * Velocity ft/sec --or-- Velocity ft/sec = flow rate (cu-ft/sec-cube) divided by (area sq/ft) V = 20.8 / 0.005451 = 3815 ft/min 5. Average intake flow rate conversions - 3815 ft/min = 3815/60 ft/sec = 63.59 ft/sec        = 21 meter/sec = 43 MPH 6. Peak air slugs will be much greater. We will try to using a handheld anemometer mounted in the air intake duct work, but the peak air flow slugs may exceed its capability. If you wish to help this project grow with one dollar or more ........ Thanks for your support! These donations will be processed by NEFCON and used for test engine stand and circuit board prototype expenses. If you would like to provide additional information or recommend suggestions for this co-op project, or join this co-op project, contact Lynn and let him know what you would like to contribute. Return to top of page. Return to HomePage Copyright © 2009 by Lynn W. Graves Reproduction or republication for commercial use prohibited without express written permission See website rules for further legal information Website owned and operated by Lynn W. Graves. Last updated ({date} ), lynn@whatifdyno.com