compression test

[Drift Machine]

Does anyone know what the compression in the cylinders should be? Right now i just tested it and they all ready between 150-160. And i was just wondering if thats low or what, oh yeah there is a 100k miles on the engine.

[:: orion ::]

What motor? If it's an SR, then you're OK IIRC...

If it's a KA24DE, then it's supposed to be 179 as "standard", and I think ~150 is the rebuild spec.

Did you test the motor warm, fuel pump fuse pulled out, and holding the throttle open???

Let us know - Brian

[96_S14_SE]

Yup brian, its: (from my 96 FSM)179 psi as standard151 psi as minimum14 psi diferential limit between cylinders

This is for the KA of course, which I hope you have seeing this is the KA forum...

[deviousKA]

if you have ka24e the minimum is ~140. so if you do your in a bit better shape.

[Drift Machine]

Yeah sorry my post was so vague(sp?) but i was kinda in a hurry and wanted to ask it before I left. Anyway, yeah it's a 92 KA24DE, i pulled the fuel pump fuse, it was warm I ran it about 20 mins before testing it. As for open throttle, we just cranked it over so i wasn't touching the gas.

[deviousKA]

thats probably the reason for the low reading. check it with throttle wide open, and take out all plugs, dont put oil in your cylinder, engine should be warm not hot. also dont use a cheap compression tester (plastic) or one that could be miscalibrated.

[Drift Machine]

Alright, thanks. I will try it with the throttle open tomorrow.