Originally Posted by
exftrplt
I'm not making myself clear. For years we had compression testers without calibration orifices. With this tester any cylinder that had leakage to below 60 psi "failed". Then someone ( I think Continental ) decided that the number was not that important, cylinder condition was. At about this time a new compression tester appeared. This tester had included a calibrated orifice and slightly different testing protocol. So my questions are who decided to put the orifice in the tester? Who decided the orifice should be .040"? Who decided on the testing protocol?