PSI Compression Numbers

M

Mazda7

New Member

Sep 23, 2004

2

0

0

Sep 23, 2004

#1

• Sep 23, 2004

• #1

Hi, I'm posting on behalf of a friend. He and I would appreciate your help in this matter. He just did a compression test on his 94' Mustang GT 5.0 and it ran 135 PSI in all 8 cylinders. He and I are wondering what would be a good compression? Alternatively what would be poor compression?

 

W

wytstang

Mustang Master

Mar 14, 2004

4,988

4

78

Summerville,SC missing South Fl. weather :(

Sep 23, 2004

#2

• Sep 23, 2004

• #2

That sound about right you have to remember a ten year old motor is not in it best form but those numbers are about right.

 

Slow5.0

Active Member

Feb 13, 2003

2,554

0

46

Portland, OR

Sep 24, 2004

#3

• Sep 24, 2004

• #3

Mine was 180psi at all 8 cilynders with 100K, now with TFS heads is 175psi

 

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smokediver27

New Member

Jun 16, 2003

203

0

0

Florida

Sep 24, 2004

#4

• Sep 24, 2004

• #4

Dont sound too bad mazda, my car was poorly cared for before i got it and mine are all 145-150

 

M

Mazda7

New Member

Sep 23, 2004

2

0

0

Sep 24, 2004

#5

• Sep 24, 2004

• #5

I see, so it's kinda low but still ok. Thanks for your replies.