Compression Test Results

[Anonymous]

I ran a compression test on my 200 today. The #'s per cylinder were consistant to each other. However I'm concerned about the overall compression. I think it's low. At what point do I become concerned with the overall compression #'s?

#1= 117
#2= 117
#3=118
#4=117
#5=115
#6=119

 

[gtm1086]

Looks pretty good to me. What you need to look for is that they are all pretty much even. As for minimum compression numbers that can be somewhat abstract. Meaning no two compression gauges read the same. later models had lower compression. Differences in head gasket thickness and so on. But I would think that as long as they are over 100 you should be ok. At least now you have a base compression to base future readings on.

 

[wsa111]

Pony express, your readings are real low. You should check them with another compression guage. You should be at least over 150# depending on the condition of you engine & any modifications. Alot depends on your compression ratio & camshaft combination. A worn timing chain will also lower your readings. At least your #s are very close. Advise on your engine combinations. William

 

[Lazy JW]

If that were an air-cooled Volkswagen running on low octane pump gas I would say it's fine but that seems low for a water-cooled Ford six. It seems odd that they are so close and yet so low, which leads me to think that ring/valve wear is not the problem. William (wsa111) gave good advice. A leakdown test could be helpful in this case.
Joe

 

[powerband]

Before you go any further, check your procedure for testing compression. As previously mentioned, the consistent low readings might indicate a guage or procedure question. Consistent readings - but all low are not typical unless engine is totally loose or a HP cam is involved.

PB 8)