He said in his original post that it starts at 2cfm and went to 11cfm at the end of the pull.MadBill wrote:I can't quite make out the blow by CFM on your screen, but assuming it's ~ 4 CFM, another 9 CFM of air leakage is a ton. If you can track down and eliminate the source(s), the pan vac. should go up big time and significantly help power and sealing, even without anything too trick in the ring department.
Measuring total loss at the pump exit he is now seeing 15+CFM at the start of the pull!
Huge leak somewhere!