compression test

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Nov 26, 2006 | 05:10 PM

86onboost

Thread Starter

2nd Gear Member

Joined: Nov 2006

Posts: 184

compression test

i was checking the compression on the 87 5.0 mustang what is the compression supposed to be on all cylinders

Nov 26, 2006 | 05:17 PM

86onboost

Thread Starter

2nd Gear Member

Joined: Nov 2006

Posts: 184

RE: compression test

bump

Nov 26, 2006 | 05:22 PM

93 LX FiveO

5th Gear Member

Joined: Aug 2006

Posts: 3,664

From: Haverhill, MA

RE: compression test

as long as all the cylinders are in the same range there shouldnt be a problem

most ppl seem to get around 120-140

Nov 26, 2006 | 05:23 PM

PX429

5th Gear Member

Joined: Apr 2006

Posts: 3,293

From: OC, Cali

RE: compression test

It's supposed to be differant on all cylinders. Quick Question. How did you perform the Test?

Nov 27, 2006 | 02:44 AM

Twisted

5th Gear Member

Joined: Feb 2006

Posts: 3,768

From:

RE: compression test

Quote:

ORIGINAL: PX429

It's supposed to be differant on all cylinders. Quick Question. How did you perform the Test?

What? Ideally, compression should be as close across all cylinders as possible.

Nov 27, 2006 | 03:05 AM

nmerrill

5th Gear Member

Joined: Mar 2006

Posts: 2,271

From: San Antonio Tx

RE: compression test

^=1 its supposed to be balanced

Nov 27, 2006 | 03:10 AM

cobra81

Joined: Nov 2006

Posts: 5

RE: compression test

Quote:

ORIGINAL: PX429

It's supposed to be differant on all cylinders. Quick Question. How did you perform the Test?

to do the test u need to dit a compression tester for autozone, pull a plug out screw the tester in the plug hole, pull your coil wier off and turn it over untell the needle stops moving, workes best with 2 people

Nov 27, 2006 | 03:11 AM

locosrt4

Joined: Nov 2006

Posts: 2

RE: compression test

how to u preform the test and wht do u need to do it

thanks
-edward

Nov 27, 2006 | 03:32 AM

FiveLiterRiceEater

5th Gear Member

Joined: Feb 2006

Posts: 2,524

From:

RE: compression test

first, remove all spark plugs. second, disconnect ignition source (the coil wire) hook up your compression guage (threads in where a spark plug was) hold the gas pedal to the floor and crank it for a few seconds (about 3 seconds) record your reading. i do this about 3 times per cylinder. should be about 120 - 140 and no cylinder should drop less than 20 % of the highest reading .. so if your highest reading on a cylinder is 140 then your lowest cylinder should be below 112 (140 x .20 = 28 140 - 28 = 112)

Nov 27, 2006 | 03:41 AM

#10

Mowin8603

3rd Gear Member

Joined: Nov 2006

Posts: 711

From:

RE: compression test

Quote:

ORIGINAL: FiveLiterRiceEater

first, remove all spark plugs. second, disconnect ignition source (the coil wire) hook up your compression guage (threads in where a spark plug was) hold the gas pedal to the floor and crank it for a few seconds (about 3 seconds) record your reading. i do this about 3 times per cylinder. should be about 120 - 140 and no cylinder should drop less than 20 % of the highest reading .. so if your highest reading on a cylinder is 140 then your lowest cylinder should be below 112 (140 x .20 = 28 140 - 28 = 112)

you mean shouldnt ??