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A bit of trivia I ran across in my research was that racing engine guys, big block etc, do what they refer to as static leak down (which is the testing we are discussing) but because they're 4 stroke engines they also measure dynamic leak down at full rpm and loaded on a dyno. In that case its...

So I rigged up my tig flowmeter to feed my leak down gauge, taking the needle valve and pretending it was an engine cylinder by sticking it at the end hose. I made two diy orifices, one .040 and one .060 each .250" long with nice conical input. I also measured my original one at .040 but only...

Thanks for the reply. For info, the automotive/motorcycle testers have a regulator and drop the line pressure to whatever you prefer. Some folks test at lower pressures, some prefer higher. The only formal, standardized spec I can find is the FAA as airplane folks like their engine...

My question really is what psi is your "zero the gauge"? My unit is in psi after the regulator e.g. where you set your testing pressure. The FAA spec most equipment is based on is 80 psi applied and a 60 degree inlet 0.040"dia x 0.250 long calibrated orifice for 5" dia or less bores, although...

Maybe I'm a bad reader, but what is the inlet pressure set to the gauge by the regulator? My guess 100 to 150 shop air, tool regulates applied to about 50 psi? Bit smaller orifice in the tool to match smaller cylinder and valve sizes? I can see results dialing as low as 40 psi applied...

Thanks Marc, I get where you're coming from. My Mighty Vac is for crankcase, carb and tank testing where you hold vac/pressure for a specified time period My two-gauged leak down tester is meant for situations where it wouldn't hold real steady e.g. a 10% leakage rate spread between intake...

Ok, the normal context of leak down on a 2 stroke chain saw is piston tdc thru spark plug hole for rings, or block carb/exh and check case halves, gaskets and crank seals, impulse line or say tank and carb pressure holding or venting. On a newer 4 mix the valves come into play too. On a car...