did a compresion check what should it be at?

R

Ryan441

Member

Nov 26, 2007

173

0

16

wintersprings, fl

Aug 23, 2008

#1

• Aug 23, 2008

• #1

its at about 163psi. when i checked it with the old motor it was at 110-120psi. is this bad or good

 

B

BobHyatt

New Member

Aug 7, 2007

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Aug 23, 2008

#2

• Aug 23, 2008

• #2

Ryan441 said:

its at about 163psi. when i checked it with the old motor it was at 110-120psi. is this bad or good

Click to expand...

What motor and what year?

Our 2000 runs around 190 cylinder to cylinder with maybe a 10psi range around that.

 

98COBRA281

10 Year Member

Nov 24, 2007

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Port St. Lucie, Florida

Aug 23, 2008

#3

• Aug 23, 2008

• #3

mine was 190-200psi across all the cylinders

 

BurningRubber

10 Year Member

Dec 6, 2004

1,865

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Aug 23, 2008

#4

• Aug 23, 2008

• #4

How many miles are on the motor?

I checked mine with 125k or so, most cylinders were in the 150-160 range, one being 175 or so, and two were 120...

If they are consistant with eachother, then 163psi is fine.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,279

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Massachusetts

Aug 23, 2008

#5

• Aug 23, 2008

• #5

Ryan441 said:

its at about 163psi.

Click to expand...

WHat were the other 7 cylinders?


It's not about a set number...but more about all 8 cylinders being within a certain percentage of each other. If you have 1 that is really off, it's something to worry about

 

R

Ryan441

Member

Nov 26, 2007

173

0

16

wintersprings, fl

Aug 24, 2008

#6

• Aug 24, 2008

• #6

idk i only checked the one bc i was checking the sparkplug to see if it was bad bc the motor is spitting at wot. its a 97 gt w/ fresh motor odometer is broken but its had about one tank of gas threw it.

 

CobraRed_96_GT

Active Member

May 20, 2006

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UCSD/La Jolla

Aug 24, 2008

#7

• Aug 24, 2008

• #7

compression on one cylinder doesn't mean anything. As long as they are consistent then all you're looking at is wear

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,279

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Massachusetts

Aug 24, 2008

#8

• Aug 24, 2008

• #8

Ryan441 said:

idk i only checked the one bc i was checking the sparkplug to see if it was bad bc the motor is spitting at wot. its a 97 gt w/ fresh motor odometer is broken but its had about one tank of gas threw it.

Click to expand...

Then you didn't really do the check right.


You gotta check all 8