CLASS RACER FORUM - View Single Post - Snap-on Leak Down Tester

Bruce Noland · 10-24-2015, 12:46 PM

I have had this unit for several years and just got around to using it the other day. I don't think it was cheap. After calls to several different Snap-on numbers and 18 prompts later I did get some info. Nothing really new, there is a .040 orifice that meters the air from the pressure side. The air passes by the leak down gauge and then to the spark plug hole. Once the cylinder is full, the leak down gauge can read the pressure. So according to these folks you can get close to a zero leakage with a .019 top ring gap. Also, I made the mistake of not using the long thread adaptor. So live and learn.

10-24-2015, 12:46 PM	#3
Bruce Noland VIP Member Join Date: Jun 2002 Posts: 1,855 Likes: 83 Liked 444 Times in 145 Posts	Re: Snap-on Leak Down Tester - Dual Gauge I have had this unit for several years and just got around to using it the other day. I don't think it was cheap. After calls to several different Snap-on numbers and 18 prompts later I did get some info. Nothing really new, there is a .040 orifice that meters the air from the pressure side. The air passes by the leak down gauge and then to the spark plug hole. Once the cylinder is full, the leak down gauge can read the pressure. So according to these folks you can get close to a zero leakage with a .019 top ring gap. Also, I made the mistake of not using the long thread adaptor. So live and learn. __________________ Bruce Noland 1788 STK