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Author Topic: Compression results 3.0 mv6  (Read 3013 times)

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calibrated

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Compression results 3.0 mv6
« on: 08 December 2015, 14:18:57 »

Just made compression test yesterday on cold engine and got following
 Cyl.
2 10.8 bar
4 10.4 bar
6 10.5 bar
5 10.5 bar
3 10.4 bar
1 10.5 bar
For relevance 10.5 bar is 153 psi..is it good or bad....engine has 90 000 miles...




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Marks DTM Calib

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Re: Compression results 3.0 mv6
« Reply #1 on: 08 December 2015, 14:21:28 »

Its very good, good compression and all pretty similar, its in fine fettle
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calibrated

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Re: Compression results 3.0 mv6
« Reply #2 on: 08 December 2015, 19:15:00 »

Its nice to know that ...so there is no need for warm engine test? As i see on internet different readings up to
225 psi or whatsoever
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Re: Compression results 3.0 mv6
« Reply #3 on: 08 December 2015, 20:36:51 »

Those results look fine to me :y
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Re: Compression results 3.0 mv6
« Reply #4 on: 09 December 2015, 00:24:20 »

When we checked mine on the old Elite, they were round about 165 - 175 psi over the 6 cylinders.  No issues with yours - you have only about 6psi range there which is pretty good.   :y
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calibrated

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Re: Compression results 3.0 mv6
« Reply #5 on: 09 December 2015, 20:23:43 »

Thank you guys
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biggriffin

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Re: Compression results 3.0 mv6
« Reply #6 on: 09 December 2015, 20:35:54 »

Just made compression test yesterday on cold engine and got following
 Cyl.
2 10.8 bar
4 10.4 bar
6 10.5 bar
5 10.5 bar
3 10.4 bar
1 10.5 bar
For relevance 10.5 bar is 153 psi..is it good or bad....engine has 90 000 miles...

don't let young bear see this, he'll start on about compression aswell as 0-60.  ;D
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omega2018

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Re: Compression results 3.0 mv6
« Reply #7 on: 10 December 2015, 01:13:33 »

here are the fully warmed up figures for that engine

Standard 12 to 15 bar (174 to 218 psi)
Maximum difference between any two cylinders 1 bar (15 psi)

i'm guessing cold figures would be about 1 bar maybe even 2 bar lower perhaps someone here does know.
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Re: Compression results 3.0 mv6
« Reply #8 on: 10 December 2015, 02:37:07 »

My figures quoted above on a cold engine ;)
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05omegav6

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Re: Compression results 3.0 mv6
« Reply #9 on: 10 December 2015, 08:50:16 »

From memory, at 170k my 3.2 was 137-142 psi on all but one, which was 129... that was cold and following ingestion of a spark plug tip... not checked recently but happy with the performance over 100k later :y
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Re: Compression results 3.0 mv6
« Reply #10 on: 10 December 2015, 09:08:12 »

I checked the compression on mine when I was doing the head gaskets, got 16bar on all 6 cylinders when cold.  Guessing the heads have been skimmed twice now  :D
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Re: Compression results 3.0 mv6
« Reply #11 on: 10 December 2015, 09:35:35 »

Jesus! 16bar!  :)

Anyone got the factory original compression figures?
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05omegav6

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Re: Compression results 3.0 mv6
« Reply #12 on: 10 December 2015, 10:56:24 »

2.0 8v 10.1
2.0 16v 10.8
2.5/3.0 10.8
2.6/3.2 9.8?
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Kevin Wood

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Re: Compression results 3.0 mv6
« Reply #13 on: 10 December 2015, 11:16:49 »

Absolute compression figures depend on the compression tester, speed of the starter motor, temperature, value timing and so on as much as the engine condition and compression ratio, so they can be pretty much ignored.

The important thing is the spread between the readings. No two cylinders will degrade the same way, so, if the engine is in poor condition, you can expect a wider spread between readings. In this respect, I can see nothing wrong with the OP's readings.
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05omegav6

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Re: Compression results 3.0 mv6
« Reply #14 on: 10 December 2015, 11:20:17 »

Figures above were Haynes supplied, except for the last one... they suggest 12-15 bar as acceptable test results with the caveat that all cylinders be within 1 bar; presumably the 2-5 bar discrepancy is to allow for variations in testing equipment and how the test is carried out...
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