Compression Test done. Here are numbers.. HELP

UnderPressureGT

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Dec 31, 2002

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TR- Jersey Shore

Jun 10, 2003

#1

• Jun 10, 2003

• #1

This summer i wanna aim for a heads/cam/intake combo and i noticed my car has blue smoke under hard accel.... runs pretty strong though soo i did a compression test anyways.. Here are the results

Cylinder 1- 120
Cylinder 2- 125
Cylinder 3- 125
Cylinder 4- 125
Cylinder 5- 100
Cylinder 6- 115
Cylinder 7- 115
Cylinder 8-115

Cylinder 5 seems a bit lower then the rest.. do i have a bad ring or something?? Im not sure if i did the test right but, the engine was warm, i took out all plugs and cranked the motor over with no throttle..

I wanna build a nice h/c/i combo, but seeing them results, im not sure if it will be worth it??? Can i get some advice here??

Thanks
joe

 

UnderPressureGT

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Dec 31, 2002

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Jun 10, 2003

#2

• Jun 10, 2003

• #2

Anyone?

 

shams42

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Jun 30, 2002

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Athens, GA.

Jun 10, 2003

#3

• Jun 10, 2003

• #3

All you numbers look low to me. When I did my compression test, my numbers were all in the 170-180psi range. Looks like it's time for a rebuilt or a crate motor.

Matt

 

J

juicedstang1

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Sep 12, 2002

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Dallas and Lubbock Texas

Jun 10, 2003

#4

• Jun 10, 2003

• #4

hey man crank the motor over at least 4 full times and hold the throttle open annd then tell us your numbers I bet they go up

 

zenboy99

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May 12, 2002

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Madison, WI

Jun 10, 2003

#5

• Jun 10, 2003

• #5

At what point are compressions numbers bad? What are stock compression numbers? I'm doing the test soon before I do my h/c/i combo.

 

UnderPressureGT

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Dec 31, 2002

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Jun 10, 2003

#6

• Jun 10, 2003

• #6

Originally posted by juicedstang1
hey man crank the motor over at least 4 full times and hold the throttle open annd then tell us your numbers I bet they go up

Click to expand...

i had the engine crankin till i got the highest number.... it will make a difference with the throttle open?

I just dont see how its time for a rebuild YET.. im not loosing any power.. motor runs real strong... pretty fast for a stock 5.0 ide say... It just blows out blue smoke on hard accel

 

408stroker5.0

The world would be a better place if all males jus

Mar 10, 2004

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Bonnyville, Alberta, CANADA

Mar 31, 2004

#7

• Mar 31, 2004

• #7

You should be at the least around 145 for a 5.0L to say your engine is in good shape. Those numbers are low, which mean's something is wrong and probably time for a rebuild. I've seen alot of high milage 5.0L spec at 165-175 Compression which is great and where you should be. I had a 5.0L a while ago that had over 195,000 Miles on it and it averaged 170. Holding the throttle wide open dosn't do anything for compression numbers, it just prevent's the car from flooding. Looks like it's time for a rebuild dude. Just insure you turn the car over at least 4-5 Times to insure a correct reading.

 

Michael Yount

Mustang Master

Apr 10, 2002

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79

Charlotte, NC

Mar 31, 2004

#8

• Mar 31, 2004

• #8

The blue smoke tells a tale before you even got the numbers; if you add h/c/i without freshening up the bottom end, you'll only speed up the demise of the bottom end. You'll need a complete rebuild or a crate short block as suggested above.