Stock Compression ?

[Smaug]

What is the factory compression rating for the 1991 4.0L V6 OHV engine?:scratch:

I get a measurement of 185 psi per cylinder on a 3 to 5 count crank.

I wasn't actually clocking it, it just felt like 3 to 5 seconds.


:ttiwwp:

 

[Masterd]

A 5 second crank is too long.

 

[Smaug]

Masterd.... See edited post.....

 

[Masterd]

Ahh I see...

Yeah a 2-3 second crank gives ideal results. 185 psi on all 6 sounds healthy.

 

[Maniak]

last time we did the compression check we were getting 165 on the good cylinders.. that was with around 230k miles.. Soo.. I'd say 185 is good... Especially if they are all there..

~Mark