Please answer this riddle


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Posted by Gil In Kentucky [75.90.200.128] on Friday, August 15, 2014 at 14:40:06 :

When I first got this truck I ran a compression check. Did not write down the results, but some cylinders were in the 125 range. All of them above 100 except the two with bent valves. The truck would start and run somewhat rough. Put in all new valves and springs, compression check went down on all cylinders some to zero. Pulled all valves sent truck to shop had all valve seats reground. Lapped in all the valves testing each one for leakage and double testing each one for leakage there was zero leakage in each one. Rechecked compression all checked out between 60 and 75 psi. backed off valve adj. and retested compression no change. My question, how is it possible for compression to go down each time I improve the valves.



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