Timing

spinman1949 said

Cuda,

The leak down is still offering some issues as one can expect cold leak down to be lower due to rings being cold no lube. The worst cylinder came back after warn up but stll pretty poor at 45%. My guess is that I have bleed on intake valve or could be exhaust valve. Either one could affect vacuum and cause the bounce. I may need to back off on initial, or recurve the mechanical advance with a bit stronger springs to keep advance from coming in too soon. As far as vacuum leak. Have not found one and besides a stready leak would not cause vacuum to bounce.

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Hi Spinman,

Is that Harbor Freight LD tester giving you those numbers? I bought one of those and man was it inaccurate and a PIA. They only run 15 PSI to activate the second gauge (Percent Gauge). 45% reading going past the rings sounds really strange (and Bad). I ended up taking the hose off tester and putting it on a tire gauge. That gave me some more accurate numbers and helped me solve a valve issue. Eventually I ordered an OTC LD tester of amazon for $20 more than the HB one and returned that POS. Now with two accurate gauges at 100psi I could really get a reading and was getting an average of 10% past the rings. If your not worried about the percentages and just want to find leaks turn that puppy up past 75psi and have a listen.

Are you sticking a hose to your ear and up the exhaust? Doing the test at TDC where the air isn't moving the crank?

I'm close by if you want to use mine.