Hi I just did a compression test on a 95 diesel truck, the truck has different pistons than stock but i dont know what kind, they are suposed to be lower compression. i had an average number of 460psi on each cylinder but #3 was only 400. I squirted oil in each cylinder and every cylinder jumped up to around 520. what are the stock pistons supposed to make? how do I know if mine is ok? and is #3 Bad enough to worry about. thanks! -

When it drops below 100 lbs difference, then you should worry. Stock pistons, with a turbo, make around 320-360. The lower compression coupled with the turbo prevents blowing out the head gasket. So I'd say your good to go. -

wildbill's Sig:

I Drive An 06 Dodge Ram 2500

Powered By a 5.9 Cummins

It Has Some Parts But Could Use More

96,000 Miles

Big Sky Bombers Social Group

yes you are fine rock and roll buddy -

hotcummins's Sig:

12v 5x18s injectors 191 delivery valves 3k springs aroura5000 single i built the all billet tranny and ats 5 disc converter #100 fuel plate fire ringed arp head studs timing 22.0 degrees tabbed kdp quick spool cam and exhaust manifold 5 inch turbo back exhaust w/ 6 inch tip afe intake k&n cold air water meth injection airdog2 165








http://www.dieseldawgs.com/

Thanks guys!

---AutoMerged DoublePost---

If stock pistons only make around 320-360, and mine is supposed to have lower compression pistons, I wonder why I am seeing 460? thanks -