blue968

Hello everyone

What is a good pressure range on a compression test on a 92 968

also what is a good fuel pressure range


TY

oppositelock

Per Porsche technical specifications, new compression is 8 bar and wear limit is 6.5 bar. Fuel pump feed rate is 850cc per 30 seconds. Fuel pressure with engine off and DME relay jumped is 3.8 bar +/- .2 bar. Value at idle is 3.3 bar +/- .2 bar. Minimum pressure after 20 minutes is 2 bar.

Jfrahm

That sounds low, in Freedom Units, if you are not up at high altitude I'd expect at least 165psi. But it's really not that big a deal, poor valve seal can really drop the compression at low RPM but it'll get down the road just fine.