Bro I have been stressing about getting one, thanks for the info bud!

@javaTL

2 ай бұрын

My pleasure! You're welcome

Thanks JavaTL, just what the Dr ordered🎯. It seems that once the vacuum is made , the valve can be shut on the a/c manifold and the timer started for the leak down reading...

@javaTL

3 ай бұрын

Exactly!

Thx for the video. You've got the right concept, but for useful valve sealing measurements your rig requires several tweaks....The typical A/C 1 to 5 Cfm pump is Way too large & is Grossly over-pumping the typical 200 cc (0.01 cubic ft) cyl head Port Volume resulting in way high erroneous Hg vac readings on badly leaking valve seats....Obviously, this Requires a Much smaller (0.2 Cfm max) vac pump or a significant Orfice Restriction (0.020" diam) at the pump side of gauge.....The gauge Needs to be a Vac only 0 --30 Hg (0--1 Bar) scale type instead of the typical A/C Pressure--Vacuum manifold gauge.....A vacuum cutoff/isolating ball valve needs to be used to enable pump off vacuum Holding/Leak-up time rate for meaningful valve sealing performance evaluation....

@javaTL

Жыл бұрын

Thanks for the comment! AutoZone does offer a hand vacuum pump rental which can be repurposed to do this same test too if you want much lower CFM.

@jimmyfavereau

11 ай бұрын

@@javaTLI would have like to see your results, I just did a head gasket on my 2000 1NZFE and had mega carbon buildup on exhaust valves and top of pistons, I cleaned and polished the valves then did the lapping, wanted to play it safe and do the vac test prior to install even though it looks great, thanks again💯