Quote:
Originally Posted by Mel
Interesting that #2 & #3 exhaust have such different lifts when they both operate off of the same cam lobe. What and I missing?
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Wear.
Cam lobes can and do wear during break in, especially if the lifter base was not properly ground or an inadequate lube used. The break in process for cam/lifter interface is very challenging in the first 30 minutes. The wrong oil is enough to wreak havoc. We have been having this problem in the auto world with non-roller lifters since they mandated the ZDDP out of the oil 10 years ago.
Larry
EDIT: sorry, I mis-read your question. That is an odd finding. no explanation here. Could be a measurement error. If it is the same lobe, I don't believe it is possible to get different readings, if the reading is taken from the lifter base or push rod if spring is removed from plunger.