Compression psi

Steve · Post by **Steve** » Fri Jul 20, 2007 6:59 am

Gents,

This may have been covered, but I can't find it in here using the "search" feature...

What should my Pinzi's cylinder psi read when doing a compression test? I can't even find a value in the repair manual (psi, atm or kPa).

Cylinders 1, 3 and 4 gave a reading of 120 psi, while number 2 gave an initial reading of 120, then topped out at 140 after cranking a few times without releasing pressure on the gauge. I did this with the other three cylinders, but they never climbed above 120.

Thanks!

Steve
1973 712M

75pinz · Post by **75pinz** » Fri Jul 20, 2007 8:16 am

I did this on one of mine and 145 was the highest number with 140 being the lowest.

ExpeditionImports · Post by **ExpeditionImports** » Fri Jul 20, 2007 9:43 am

When was the last time the valves were adjusted? Recently had a rig in for service with horrible compression, varying from cylinder to cylinder. After valve adjust they all came up to a reasonable range. 120 across all 4 + or - 5% is not bad.

Cheers,

Scott

Steve · Post by **Steve** » Fri Jul 20, 2007 11:34 am

Scott,

Not since I've had it, in which I've driven about 1200km. I'm not driving it at the moment as a precaution, and hope to get the valves adjusted in the next week or so.

Thanks!

Steve