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Old 03-13-2019, 11:12 PM   #1
Turvey17
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Member#: 498089
Join Date: Feb 2019
Default Compression test numbers high?

Got a compression test done on a 11 sti hatch that Iím looking at purchasing.
The numbers came out
Cylinder 1. ~ 169
Cylinder 2. ~ 170
Cylinder 3. ~ 169
Cylinder 4. ~ 171

Leakdown test
Cylinder 1 - 0
Cylinder 2 - 4
Cylinder 3 -0
Cylinder 4- 3

Are the compression numbers high? Iíve seen a lot of people saying around 140-160 is ideal.
Any help is apprectiated
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Old 03-14-2019, 06:21 AM   #2
rtv900
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Quote:
Originally Posted by Turvey17 View Post

Are the compression numbers high? Iíve seen a lot of people saying around 140-160 is ideal.
yes, WAY too high, you need to pull those heads and score up the cylinders with a file. Too much compression is horrible, you want that power leaking out.

Come on man.
Too high?

plus, I think somebody kind of bamboozled you because they tell you that two of your cylinders have ZERO percent leakdown?
That isn't possible so they lied or are totally incompetent in that kind of test.
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Old 03-14-2019, 06:39 AM   #3
Ryandorres
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Quote:
Originally Posted by rtv900 View Post
yes, WAY too high, you need to pull those heads and score up the cylinders with a file. Too much compression is horrible, you want that power leaking out.

Come on man.
Too high?

plus, I think somebody kind of bamboozled you because they tell you that two of your cylinders have ZERO percent leakdown?
That isn't possible so they lied or are totally incompetent in that kind of test.
+1
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Old 03-14-2019, 08:27 AM   #4
Exit 37
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They look consistent which is important.
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Old 03-14-2019, 08:43 AM   #5
Turvey17
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Default

Quote:
Originally Posted by rtv900 View Post
yes, WAY too high, you need to pull those heads and score up the cylinders with a file. Too much compression is horrible, you want that power leaking out.

Come on man.
Too high?

plus, I think somebody kind of bamboozled you because they tell you that two of your cylinders have ZERO percent leakdown?
That isn't possible so they lied or are totally incompetent in that kind of test.
I got it done at a reputable Subaru shop. I doubt they are lying to me, the engine was recently rebuilt 12k ago and they remachined the heads which could cause slightly higher compression. Same with having basically a brand new engine
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Old 03-14-2019, 08:59 AM   #6
rtv900
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Quote:
Originally Posted by Turvey17 View Post
I got it done at a reputable Subaru shop. I doubt they are lying to me, the engine was recently rebuilt 12k ago and they remachined the heads which could cause slightly higher compression. Same with having basically a brand new engine
the compression numbers aren't outrageous and certainly not impossible.

Zero leakdown however is impossible
So I don't think that is not true, I know it isn't true.
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