This is topic fox body compression test in forum Tech Talk at Northern California Ford Owners  .


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Posted by 91 5.0 (Member # 1527) on :
 
Anyone know what my compression should be? I gave it a test and all cylinders were about 160 psi. Is this good, bad, what?
 

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Posted by Black94 5.0 (Member # 655) on :
 
When you did the test were all of the spark-plugs out at the same time??...And did you have the throttle all the way open??...How much was the psi on each cyl.?? Around 160psi I think is good..My 5.0l was about 160psi also..
 

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Posted by 91sleeper (Member # 779) on :
 
Dustin if you were to get a Chiltons manual it has a lot of this type of info and other torque specs and other info you need to know that helps out a lot. Not expensive at all. I reccomend you getting one. I'll check for you when I get home.
 

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Posted by shade-tree (Member # 298) on :
 
The 'hot' readings from my motor (55k mile '94 cobra shortblock) were all 165-170 with the throttle left alone (closed) and multiple cranks from a remote starter (like 5) to get peak value on a stock cam, 9:1 compression stock longblock.

being hot or cold can swing it an easy 10 points.
 

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Posted by ONELOWSPLITBUMPR ON N2O ANDONELOWLX (Member # 2067) on :
 
damn my small block chevy had about 215 and it ran on pump gas
 

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Posted by st5150 (Member # 51) on :
 
My 200,000 mile motor was 145 psi cold and 155 psi warm. Leak down was anywhere from 20-30% though
 

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Posted by cobraman1994 (Member # 467) on :
 

quote:

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Originally posted by st5150:
My 200,000 mile motor was 145 psi cold and 155 psi warm. Leak down was anywhere from 20-30% though

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your motor is a freak of nature.
 

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Posted by 91 5.0 (Member # 1527) on :
 

quote:

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Originally posted by Black94 5.0:
When you did the test were all of the spark-plugs out at the same time??...And did you have the throttle all the way open??...How much was the psi on each cyl.?? Around 160psi I think is good..My 5.0l was about 160psi also..

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quote:

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Originally posted by 91sleeper:
Dustin if you were to get a Chiltons manual it has a lot of this type of info and other torque specs and other info you need to know that helps out a lot. Not expensive at all. I reccomend you getting one. I'll check for you when I get home.

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quote:

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Originally posted by cobraman1994:

quote:

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Originally posted by st5150:
My 200,000 mile motor was 145 psi cold and 155 psi warm. Leak down was anywhere from 20-30% though

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your motor is a freak of nature.

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