| | Compression Test |  |
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fordman68
Valued Member
Posts : 115
Age : 31
Location : illinois
|  Subject: Compression Test February 20th 2010, 6:32 pm | |
| I just did a compression test on my 1988 302 and got this cyl1=150psi cyl2=156psi cyl3=150psi cyl4=160psi cyl5=150psi cyl6=160psi cyl7=150psi cyl8=150psi is that good or bad? | |
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fordman68
Valued Member
Posts : 115
Age : 31
Location : illinois
| | Subject: Re: Compression Test February 20th 2010, 6:38 pm | |
| oops i meant, cyl1=150 cyl2=150 cyl3=150 cyl4=150 cyl5=150 cyl6=160 cyl7=160 cyl8=150 | |
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johnboggs21
Almost Addicted Member
Posts : 1171
Age : 32
Location : Michigan
| | Subject: Re: Compression Test February 20th 2010, 6:40 pm | |
| ya kno ya can edit ur posts....lol | |
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fordman68
Valued Member
Posts : 115
Age : 31
Location : illinois
| | Subject: Re: Compression Test February 20th 2010, 6:48 pm | |
| ya but was quicker to just put it there lol | |
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In2Trux
Moderator
Posts : 1381
Age : 62
Location : North Bay Ont, Canada
| | Subject: Re: Compression Test February 20th 2010, 9:08 pm | |
| - fordman68 wrote:
- I just did a compression test on my 1988 302 and got this, is that good or bad?
The actual number you get in P.S.I. is not your end result. There are too many variables such as wear, valve train specs and overall engine condition. Two engines of the same type may give very different readings. A average reading of 155 psi sounds like it's in the acceptable, down right Good for an engine of that age. . If all of your psi readings are within 10% of each other, it's considered a good result. The test is meant to tell you whether a cylinder is leaking or having other troubles as compared to other cylinders. During your test.. Was the gauge pressure dropping significantly while you were reading the gauge? | |
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fordman68
Valued Member
Posts : 115
Age : 31
Location : illinois
| | Subject: Re: Compression Test February 20th 2010, 11:04 pm | |
| no after 3 cranks it was at its max and it held there until i let the pressure off | |
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merlin5577
Admin
Posts : 2938
Age : 39
Location : Taunton, MA
| | Subject: Re: Compression Test February 21st 2010, 9:14 pm | |
| - In2Trux wrote:
- If all of your psi readings are within 10% of each other, it's considered a good result.
The test is meant to tell you whether a cylinder is leaking or having other troubles as compared to other cylinders.
Exactly. As long as the readings are close to each other, that means the engine is wearing evenly. If one cylinder is much higher or much lower, you have a problem. Yours look good Fordman68. | |
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fordman68
Valued Member
Posts : 115
Age : 31
Location : illinois
| | Subject: Re: Compression Test February 22nd 2010, 9:46 pm | |
| im starting to think that i have a slow head leak instead of a blown gasket and that it is building pressure after being ran for a while but im not sure | |
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Jared Olson for SO IL
Valued Member
Posts : 376
Age : 31
Location : Campbell Hill, IL
| | Subject: Re: Compression Test February 27th 2010, 11:55 am | |
| why is this in Farm equipment KP? lol btw happy bday. | |
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johnboggs21
Almost Addicted Member
Posts : 1171
Age : 32
Location : Michigan
| | Subject: Re: Compression Test February 27th 2010, 1:18 pm | |
| - Jared Olson for SO IL wrote:
- why is this in Farm equipment KP? lol btw happy bday.
i was wondering that myself lol | |
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fordman68
Valued Member
Posts : 115
Age : 31
Location : illinois
| | Subject: Re: Compression Test February 27th 2010, 5:05 pm | |
| me 2 idk how and or why its in farm equipment And thanks for the Happy Bday | |
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merlin5577
Admin
Posts : 2938
Age : 39
Location : Taunton, MA
| | Subject: Re: Compression Test February 27th 2010, 7:09 pm | |
| Moved to the 'Ford Motors' section. | |
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fordman68
Valued Member
Posts : 115
Age : 31
Location : illinois
| | Subject: Re: Compression Test February 28th 2010, 12:03 am | |
| - merlin5577 wrote:
- Moved to the 'Ford Motors' section.
Thanks LOL. | |
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