Personal Compression Numbers 2004 S60r

4676 Views 7 Replies 5 Participants Last post by JARMO, May 17, 2009

chinaonnitrous1

Discussion Starter · May 16, 2009

Just seeing if there is any feedback or other opinions. I looked at KillerBs' archived thread. His was a bit higher than mine... in the 120's consistently.

Conditions

- Engine slightly warmer than room temp, valve cover warm to the touch, but not hot. You can rest your elbow on it while changing the TCV hoses and it won't hurt.

- All 5 Plugs out

- Fuse inside door jam pulled for Fuel pump #33 I think

- WOT during cranking.

- Built highest compression on 3rd puff

Drivers to Passenger side

118 100 110 110 115

The one with the 100 Reading, I poured in a little bit of oil, and compression rose to 110.

Seems like this is just a bit on the low side. 2004 with 60k miles.

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chinaonnitrous1

Discussion Starter · #2 · May 16, 2009

Buddy just suggested that if the engine was actually closer to operating temperautre numbers would be a bit better.

I got stuck playing Bejewled blitz on Facebook.

DO NOT UNDER ANY CIRCUMSTANCES PLAY THAT GAME.

You'll get sucked into it for an hour.

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Oceans60R

· #3 · May 16, 2009

Re: (chinaonnitrous1)

Engine should be run until thermostat opens before checking compression if possible.
Spec is 1.1-1.3 MPa or 160-189psi
Yours seems a little low but some of that could be because the operating temp not achieved or not enough revolutions per test. I generally try for 4 compression strokes.
Also remember to switch ignition OFF after each cylinder test, otherwise throttle stops communication after 2 minutes and no more WOT during cranking. http://********************/smile/emthup.gif

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chinaonnitrous1

Discussion Starter · #4 · May 16, 2009

Re: (Oceans60R)

Quote, originally posted by Oceans60R »

Engine should be run until thermostat opens before checking compression if possible.
Spec is 1.1-1.3 MPa or 160-189psi
Yours seems a little low but some of that could be because the operating temp not achieved or not enough revolutions per test. I generally try for 4 compression strokes.
Also remember to switch ignition OFF after each cylinder test, otherwise throttle stops communication after 2 minutes and no more WOT during cranking. http://********************/smile/emthup.gif

Doh'.

Well, atleast one wasn't reading 0.

I did crank to 4 and even 6 however, the numbers were the highest at 3. So the engine seems like its building pressure normally.

After a few issues, the car runs great. I'll do a better test on the next round.

Also, the car was switched off after each test, as I did not want all the accessories running and draining the battery.

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JRL

· #5 · May 16, 2009

Re: Personal Compression Numbers 2004 S60r (chinaonnitrous1)

You did something wrong, you should be around 160 ish

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chinaonnitrous1

Discussion Starter · #6 · May 16, 2009

Re: Personal Compression Numbers 2004 S60r (JRL)

Ya the engine was cold.

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Turb04S60

· #7 · May 17, 2009

also, consider connecting a battery charger or booster to help get rotational speed up.

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JARMO

· #8 · May 17, 2009

Re: Personal Compression Numbers 2004 S60r (chinaonnitrous1)

The numbers you receive with a compression test are not THE real numbers .
You can only use them to look for differences between cilinders.
wow, you can't compare yours with an other car measured with an other tool and different atmospheric conditions.

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