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Author
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Topic: fox body compression test
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91 5.0
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Member # 1527
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posted
 
 
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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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
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.. ![[Smile]](smile.gif)
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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Gear Head
JARED
Member # 779
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posted
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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Support our troops!
Posts: 5685 | From: EASTBAY | Registered: Jan 2002
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JoeT
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Member # 298
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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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1984 Ford Tempo AOD--- RIP
Posts: 6785 | From: San Jose | Registered: Jun 2001
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4RS FED
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Member # 2067
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damn my small block chevy had about 215 and it ran on pump gas ![[Eek!]](eek.gif)
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i have a twin turbo mustang and you don't!
Posts: 3686 | From: 650 | Registered: Nov 2002
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Stimson
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Member # 51
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My 200,000 mile motor was 145 psi cold and 155 psi warm. Leak down was anywhere from 20-30% though
Posts: 2373 | Registered: Jun 2000
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cobraman_1994
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Member # 467
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quote:
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
your motor is a freak of nature. ![[worship]](graemlins/worship.gif)
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86 GT
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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91 5.0
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Member # 1527
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posted
quote:
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..
all plugs were out and the throttle was completely open.
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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91 5.0
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Member # 1527
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posted
quote:
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.
I already have one, I guess ill check in there.
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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96Forged281
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Member # 2158
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posted
quote:
Originally posted by cobraman1994:
quote:
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
your motor is a freak of nature.
does the over all compression of the engine make the psi #s differ???
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96 Stang GT Convertible Looks Stock =)
Posts: 277 | From: Modesto | Registered: Dec 2002
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Stimson
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Member # 51
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posted
Yes, the static compression ratio of the motor directly affects your compression readings.
Posts: 2373 | Registered: Jun 2000
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