Compression Test Results

[The Warden]

Hello!

Just finished up testing the compression on my engine. The numbers are below:

Port Bank:
#1 - 350 psi
#2 - 320 psi
#3 - 320 psi
#4 - 320 psi
Starboard Bank:
#1 - 327 psi
#2 - 380 psi
#3 - 350 psi
#4 - 360 psi

These numbers were from a cold engine with a starter that's on its way out. Looking at my Ford shop manual, with the highest cylinder being at 380 psi, the lowest should be no lower than 285 psi, and going by the same chart, I'm safe with compression any higher than 195 psi.

Does anyone have any further input here? I'm a little concerned that the port bank seems to be consistently lower than the starboard bank.

Should I re-test with a replacement starter, or should I just put new GP's in and call everything good?

Any thoughts would be appreciated...thanks in advance!

 

[F350camper]

I dont remember if you've said how many miles are on that engine, but I think those are great looking numbers.

 

[The Warden]

Sorry, forgot to mention...I've got 220K miles on the engine, and I'm sure you remember what I did with it over the summer *lol*

I actually did a compression test about this time last year (before opening the engine up)...the numbers were:

Port Bank:
#1 - 460 psi
#2 - 440 psi
#3 - 420 psi
#4 - 460 psi

Stbd Bank:
#1 - 460 psi
#2 - 440 psi
#3 - 460 psi
#4 - 500 psi

However, these numbers were done with a hot engine (I shut the engine down and immediately started pulling GP's; this time, the engine had not been run in 3 days) and with a different gauge. Coupled with the fact that I had the head off between thest two tests, I'm hoping that that accounts for the differences...

 

[NJKen]

SOunds OK to me. If the starter is half junk so bee it. The results you have are within spec for equality. Put a new set of GP's in er and drive on!
Ken

 

[The Warden]

Works for me

again!

 

[argve]

Enjoy - don't worry about it. We are more worried about balance between cylinders not big numbers.

 

[jdkline]

Lower than I expected but if the starter is junk and teh engine is cold that probably accounts for teh difference. Well within specs for equality and compression in any case, throw a new set of glow plugs and a new satrter in and call it good. Tim, you might also think about teh solid satte glow plug conversdion. Its simple enough and it works out great. Doesn't require a lot of butchery the way I did it. If I can do it you can do it

 

[The Warden]

JD, I was actually going to E-mail you about it in the next day or two. I haven't decided for sure re: the conversion yet...$$'s the big deciding factor here; it looks worth it, but I'm not sure yet if I can spare the $$ yet. Have to call my local IH dealer and see what they want for the kit...I heard $310 from Hoss; I might be able to spare that...