proxlamus© Posted May 2, 2007 Share Posted May 2, 2007 I ran a compression test on my motor (F54/P90 stock dished pistons) and a fel-pro headgasket and I yeilded 135psi across the board. Keep in mind I am at 5,700 feet so the numbers will read lower. I installed a 2mm headgasket and new cam, did another compression test and I get 100psi across the board?! WTF! the bolts are torqued to spec, copper spray on the headgasket, wtf. The test was done while the motor was HOT, dry, every plug removed, full open throttle, each cylinder tested for 6 seconds. After doing a WET test I have 110psi across the board. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted May 2, 2007 Share Posted May 2, 2007 Cam timing? Quote Link to comment Share on other sites More sharing options...
blueovalz Posted May 2, 2007 Share Posted May 2, 2007 What is the difference in the cam specs between the two cams? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted May 2, 2007 Share Posted May 2, 2007 Bigger cam = lower compression on the tester. Sounds fine to me. Quote Link to comment Share on other sites More sharing options...
TimZ Posted May 2, 2007 Share Posted May 2, 2007 Bigger cam = lower compression on the tester. Sounds fine to me. Yep - not to mention the addition of the 2mm head gasket (I'm assuming that's different from before, too) Quote Link to comment Share on other sites More sharing options...
TheNeedForZ Posted May 2, 2007 Share Posted May 2, 2007 what do you mean by "across the board"? You mean the maximum variation? Quote Link to comment Share on other sites More sharing options...
280zwitha383 Posted May 3, 2007 Share Posted May 3, 2007 He means all of them are reading the same at whatever pressure stated. Quote Link to comment Share on other sites More sharing options...
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