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Old 11-25-2022, 03:10 AM   #1
sc0terdad
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Default Buying an engine, too much compression?

So I am embarking on my first engine purchase and, I have recently had the engine compression tested pre purchase, it tested 200psi across, now I have heard that somthing like 175/180/160 ish is all a very good sign and that it means an engine is healthy, but 200? That seems a bit high. Could it mean that it has excessive carbon buildup or somthing!

Anyway I would like to hear from anyone who has knowledge on the subject.

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Old 11-25-2022, 03:41 AM   #2
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What engine? Also, compression tester gages can vary quite a bit.
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Old 11-25-2022, 03:45 AM   #3
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Originally Posted by 2manyturbos View Post
What engine? Also, compression tester gages can vary quite a bit.
92 b230f
Don’t know what comp tester was used as it was done by the seller
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Old 11-25-2022, 04:13 AM   #4
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I have seen 195 psi on a 94 B230FD. I don’t think the 200 psi is anything to be concerned about.
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Old 11-25-2022, 12:32 PM   #5
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I have seen 195 psi on a 94 B230FD. I don’t think the 200 psi is anything to be concerned about.
Sweet thanks
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Old 11-25-2022, 01:53 PM   #6
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I've had 210 on a hot low mileage b230f, so I wouldn't be concerned about that at all. sounds like a good engine to me
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Old 11-25-2022, 03:22 PM   #7
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Quote:
Originally Posted by sc0terdad View Post
92 b230f
Don’t know what comp tester was used as it was done by the seller
If you don't even know what tester was used, how do you even know he is telling the truth? 200 sounds made up to me. What are the odds it would be such an even number? Did he make a video of the test?
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Old 11-25-2022, 03:53 PM   #8
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I too, measured 200psi on three of four cylinders on my friends high miles b230f. The other cylinder was 195. That engine used M1 the whole time.

It's a good engine at least compression wise.
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Old 11-25-2022, 04:07 PM   #9
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^^ That's how that B230FD was. The 195 psi reading was cold cranking compression after sitting for a long time. Three were 195, the 4th was 185. That engine had 284,000 miles on it. The values were great. I never bothered to check it again once it was running. I have tested plenty of B230 engines that had the same readings across all 4 cylinders within 1-2 psi of each other.
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Old Yesterday, 12:28 AM   #10
sc0terdad
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Quote:
Originally Posted by atikovi View Post
If you don't even know what tester was used, how do you even know he is telling the truth? 200 sounds made up to me. What are the odds it would be such an even number? Did he make a video of the test?
if I had to guess id say it was rounded, it is being sold by a reputable used volvo parts dealer/ scrap yard from where I'm from, I trust that it is a genuine reading
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