Compression results, thought I would share.

a_k

New Member

Nov 12, 2004

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Saratoga NY

Dec 30, 2005

#1

• Dec 30, 2005

• #1

The other night I went and did a compression test and I am really suprised. Here are the results.

1 - 120
2 - 100
3 - 100
4 - n/a I didn't feel like bothering with it after the rest of them
5 - 105
6 - 100
7 - 100
8 - 100

The engine has 124k on it but it ran strong or so it seemed. Oh well there goes the h/c/i plan. The good news is i'll have a fresh bottom end. I went and talked to the engine builder and it's not as expensive as I though

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Dec 30, 2005

#2

• Dec 30, 2005

• #2

Are you sure the tester's gauge works ok? Was the motor hot (not as important for hypereutectic pistons as forged, but still..........).

I would do a wet compression test to see how dramatically the numbers go up.

Good luck.

 

a50sn95

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Oct 12, 2001

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Dec 30, 2005

#3

• Dec 30, 2005

• #3

You held the throttle wide open during the tests, right...?

 

VibrantRedGT

"STANGNET'S PENGUIN SMACKER"

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Nov 29, 1999

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Dec 30, 2005

#4

• Dec 30, 2005

• #4

a50sn95 said:

You held the throttle wide open during the tests, right...?

Click to expand...

Doesn't look like it. The motor can't be ice cold either. Also hook up a battery charger while doing the test.

 

Zero Signal

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Feb 24, 2003

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Dec 30, 2005

#5

• Dec 30, 2005

• #5

Yeah the battery will start to die and your results will show less and less pressure as you go. I made that mistake the first time around.

 

ROLLIN5.0

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Nov 19, 2004

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Dec 30, 2005

#6

• Dec 30, 2005

• #6

I wouldn't be too concerned with those results. There are a ton of factors that can give you low readings. The main goal is to see similar results across the board, which it looks like you did.
Brandon

 

a_k

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Nov 12, 2004

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Saratoga NY

Dec 31, 2005

#7

• Dec 31, 2005

• #7

a50sn95 said:

You held the throttle wide open during the tests, right...?

Click to expand...

I did not do that, I'll try that again, but I did test the compression on my 82 rabbit and its got 122 all across.... Hopefully it will go up a little

 

I

igotyofire

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Feb 26, 2004

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Southern California

Dec 31, 2005

#8

• Dec 31, 2005

• #8

whats normal for our 9:01 compression stangs

 

G

Green 94 5.0

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Mar 25, 2002

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Ft. Lauderdale, FL

Dec 31, 2005

#9

• Dec 31, 2005

• #9

as someone above me said, uniformity with the numbers is more important than the actual reading to a point. try it again with the throttle open and the numbers should rise a bit.

 

CManT1914

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Feb 5, 2004

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Dec 31, 2005

#10

• Dec 31, 2005

• #10

igotyofire said:

whats normal for our 9:01 compression stangs

Click to expand...

You're mainly looking for an average reading, not one in particular. So if cylinders 1, 2, and 4 are 140, while 3 is 100, something is fubar with cylinder 3.

FWIW, when I did my compression tests this summer, I got around 155 to 160 all around.

 

mo_dingo

20+ Year Stangneter

Aug 26, 2003

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Tucson, AZ

Dec 31, 2005

#11

• Dec 31, 2005

• #11

igotyofire said:

whats normal for our 9:01 compression stangs

Click to expand...

Ours are 9.5:1, fyi


And consistency in numbers is more important. Do it dry and wet, as that will tell you whether you have a head problem, or a ring problem, respectively.
Scott

 

blksn955.o

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Mar 15, 2002

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st.louis mo 314

Dec 31, 2005

#12

• Dec 31, 2005

• #12

I have always seen like 8.8:1 or 8.9:1 as the comp. on the 94-95 GT's?

 

M

mackey

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Jan 25, 2003

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Dec 31, 2005

#13

• Dec 31, 2005

• #13

8.5:1

 

blksn955.o

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st.louis mo 314

Dec 31, 2005

#14

• Dec 31, 2005

• #14

/\/\/\

havre seen that too. I ahve never seen above 9:1


**ps kind drunk right now