Like trying to blow up a balloon without being allowed to take a breath first. Mike "Rocket J Squirrel" Elliott 71 Type 2: the Wonderbus 84 Westfalia: Mellow Yellow ("The Electrical Banana") 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano KG6RCR On 9/13/2007 1:59 PM Mike S wrote: > At 04:26 PM 9/13/2007, Todd Last wrote... >> Does it matter if the throttle is held wide open or left closed? >> I recall some instructions which stated to have the throttle held open >> when checking compression. > > Yes, it can make a big difference. > > Ultimate compression is something greater than the intake pressure X > the compression ratio (greater because of adiabatic affects - > compression makes the air hotter, which makes the pressure even greater > than the CR would seem to indicate). If the throttle is closed, the > intake pressure will be less than atmospheric (a partial vacuum), and > therefore the indicated compression pressure will be less than you want > to measure. > |
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