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1998 V70XC Compression Test Results

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

bubbeck
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Year and Model: 1998 V70XC
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bubbeck

1998 V70XC Compression Test Results

Post by bubbeck » Sun Oct 29, 2017 1:33 pm

Hey everybody,

I was going through doing a Stage 0 tuneup on my '98 V70XC with 221k miles, and while replacing the spark plugs figured I might as well do a compression test to make sure its worth putting more time/money into the car. The engine isn't having any problems to my knowledge just figured I'd check.

I forgot about warming the engine up first, but I did the test with the throttle open and got ~170psi for cylinders except cylinder #4 which was ~162-164. Seems like most cylinders then are pretty good (I found 168 psi as a spec somewhere, can't find it again though), but should I be worried about cylinder #4? Is it worth doing the test again with a warm engine or should I just let it ride?

kahl
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kahl

Re: 1998 V70XC Compression Test Results

Post by kahl » Sun Oct 29, 2017 3:16 pm

I think those are great numbers. On the two 98s I have both are swimming around 155 to 160. Both have about 185 on the clock. For giggles I would be interested in compression with the engine hot.

j-dawg
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j-dawg

Re: 1998 V70XC Compression Test Results

Post by j-dawg » Sun Oct 29, 2017 3:27 pm

You're probably fine.

What's important isn't so much the exact numbers you get - those will vary according to ambient temperature, engine temperature, etc - but that all five cylinders are close to each other. The red flags only fly if one or more cylinders are a significant percentage below the others. Maybe you've got some gunk building up on a valve seat or something, but the things that justify deferring maintenance will bring your compression down way lower than that.
1999 V70 T5 5-SPD | ~270k mi | burns more oil than gasoline

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Roger_850T
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Roger_850T

Re: 1998 V70XC Compression Test Results

Post by Roger_850T » Sun Oct 29, 2017 8:44 pm

I agree those are all pretty good! You have a pretty small deviation, but not something that I would tend to worry about. (If one were down more like 120 then I would worry.) Write them down, and check again in another 10k miles if you want to track it.

Roger
'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
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'84 264 Diesel, RIP at 160k
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rspi

Re: 1998 V70XC Compression Test Results

Post by rspi » Mon Oct 30, 2017 8:50 am

For the turbo engines the numbers should be between 156 - 186. All numbers should be within 15% of each other. Fifteen percent of 170 is 144. As long as your numbers are within that you should be good. Turbo cars can run fine with lower compression. As mentioned, as long as your numbers are above 125, you should be ok to keep driving.
'95 855 T-5R M, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red 25/32 mpg
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