What's the Compression like on Your Turbo 5 Volvo?


grasshopperR

Compression  

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On 11/19/2016 at 9:13 PM, grasshopperR said:

Every time I look up a Volvo compression test, it's always the people with horrible compression (90-125). I was wondering what VS has on their cars. Hopefully better!

Edit: including mileage in a post would be nice

If I remember right 185 is considered new, and 150 is the lower end where it starts to go become concerning. I remember doing it on a 100k engine that went another 100k and I believe at the time I was mostly getting in the mid 150's. Not all gauges read the same - precision varies.

Rule of thumb is that uniformity is more important. That's because unless the car has crazy high mileage, you're not expecting all 5 cylinders to fail simultaneously. and uniformly. So if you see 140-140-140-90-140, you've got a problem, but it isn't the 140's. If you're getting uniform but low numbers, I'd probably get another gauge to confirm.

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3 hours ago, Fudge_Brownie said:

If I remember right 185 is considered new, and 150 is the lower end where it starts to go become concerning. I remember doing it on a 100k engine that went another 100k and I believe at the time I was mostly getting in the mid 150's. Not all gauges read the same - precision varies.

Rule of thumb is that uniformity is more important. That's because unless the car has crazy high mileage, you're not expecting all 5 cylinders to fail simultaneously. and uniformly. So if you see 140-140-140-90-140, you've got a problem, but it isn't the 140's. If you're getting uniform but low numbers, I'd probably get another gauge to confirm.

I did 2 tests so far, one test showed I was in the 155-165 area and one faulty gauge wouldn't show anything above 60 psi. So, I don't know for sure completely.

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  • 2 weeks later...

After replacing my cylinder head last summer (worn valve stem seals were leaking oil into the exhaust, no effect on combustion/compression) I tested mine with a rented gauge from Autozone, so I can't speak to the absolute accuracy of the gauge, but all 5 cylinders were between 165 and 170.

I was pretty happy with those numbers - for a motor with ~185k on it at the time to exhibit less than 5% variation across all 5 cylinders seemed pretty good to me.

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