Compression #s Analysis, Please

[Duster]

Looking for a little feedback on compression #s for a 2F /FJ60, a little over 100K.

Numbers from 1 thru 6 are: 135, 140, 140, 140, 140, 135.

Memory tells me the FSM calls for standard compression of 149 with a limit of 114, with no more than 14psi between the cylinders. What I'm looking for here is real opinions from those who would know.

As always, thanks.

 

[Cruisergreg]

What altitude are you performing the test at?

 

[Duster]

What altitude are you performing the test at?

Near sea level, so little to no altitude. Thanks - forgot to mention that.

 

[cahilc]

If it were my truck ... I'd be a happy camper as long as everything else was nominal. What is nice about your numbers is the flatness or only deviating by 5 psi. Plus the ends of the I-6 run hotter anyway ??? so having 135(5psi deviation) on 1 & 6 is normal ???

Just my thoughts,
Cahil

 

[HZJ60 Guy]

Wow, those are low. Mine are all above 600!



TB %$#@^

 

[NocalFJ60]

Those sound like good numbers to me. That is only a 4-5% difference from 135 to 140. My last compression test on my 2f with 130K is far worse.

Call it good!

You have another problem that led you to check compression?

 

[Mike S]

With those numbers, I doubt that your engine will last more then a couple hundred thousand miles more. Better keep an eye on it...

Mike S

 

[Duster]

You have another problem that led you to check compression?

Problems yes, but totally unrelated. Just trying to figure out what it all means before spending any more money!

 

[hilander]

It's funny you should post this today, I just finished doing a compression test on my truck and all of mine were between 132 and 140. I am also preety close to sea level, sounds like those numbers are OK.

Good times.

 

[Duster]

With those numbers, I doubt that your engine will last more then a couple hundred thousand miles more. Better keep an eye on it...

Mike S

Guess I should consider that one a big ol' nod of approval. Almost feel silly for asking the question...nah.

Thanks to all.

 

[Mike S]

Yeah. Just keep the oil fresh and keep it tuned. There are a number of guys posting here who have over 300K miles on the 2Fs. I am a piker - only 165,000 miles.