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kbannon 
Admin Group
E39 525i Sport Individual
Joined: 09-October-2002
Location: 64 Zoo Lane
Status: Offline
Points: 15508
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 Topic: Compression test results
Posted: 10-July-2004 at 18:10 |
I had mine tested today on the 523i. Anyone care to comment on these results [dealer says they way above average]:-
| Cylinder # |
Dry |
Wet |
| 1 |
11.25 |
15.00 |
| 2 |
12.00 |
14.00 |
| 3 |
11.25 |
13.75 |
| 4 |
12.00 |
14.50 |
| 5 |
12.00 |
14.00 |
| 6 |
12.00 |
14.50 |
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Current: 2009 E60 520d "Sport" tractor
Previous: 1989 E30 320i SE
1997 E39 523i
2003 E39 525i Sport Individual
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Brucey
Really Senior Member II
Joined: 07-March-2004
Location: United Kingdom
Status: Offline
Points: 744
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Posted: 10-July-2004 at 18:19 |
-I assume the pressures (in BARs) were obtained by cranking with the starter motor (~x10), with the throttle butterfly wide open.
-if so, the dry pressures seem fine.
-the 'wet' pressures do seem high- I would suspect that a little too much oil was added to each combustion chamber for these tests.
-if so I bet it smoked like blazes when they started it up again, throwing all sorts of crud down your exhaust pipes.
-why not ask them if they are TRYING to destroy your cats...????
cheers
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~~~~~~~ Brucey ~~~~~~
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BM Fan
Bavarian-Board Contributor
Joined: 19-January-2004
Location: Ireland
Status: Offline
Points: 1054
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Posted: 12-July-2004 at 09:40 |
Killian
If its bar then they are not to different from my own results. The main difference when compared with mine is that I have a larger differnce between cylinders approx 20psi (1.5bar). If I remeber right my lowest was 170psi.
11.25 - 163psi 12.00 - 174ps
Does anyone know what a new engine spec is and what is the story with differences between cylinders, is that significant aside from the fact that some cylinders are more worn than others. Which is to be expected given that my block is original and its cylinders 1 and 6.
My block is supposed to be OK also but what are the actual figures that distate when the block needs to be replaced?
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Martin
In BMW exile at the moment (Shame on me for lurking!!!)
Previous Models
2001 E39 520i Auto
1996 E36 M3 Evo Individual
1996 E36 328i Coupe
1997 E36 318i Conv
1992 E36 316i Sln
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dave 328
Really Senior Member II
Joined: 21-October-2003
Location: United Kingdom
Status: Offline
Points: 835
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Posted: 12-July-2004 at 10:46 |
some where in between 10 and 12 psi is OK. A difference of 1 or 2 PSI per cylinder is also within limits, but idealy it should be very close. New engines won't be different really - could be less until the bores are run in, or more, depends.
Most engines will vary between cylinders.
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328 Coupe Sport, Digital climate, full leather, OBD computer, De-restricted with M50 manifold, big bore throttle, chippeduk remap, custom cold cone intake and X-brace
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kbannon
Admin Group
E39 525i Sport Individual
Joined: 09-October-2002
Location: 64 Zoo Lane
Status: Offline
Points: 15508
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Posted: 12-July-2004 at 10:54 |
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I had my NCT (MoT) yesterday & the emissions were excellent which is another good sign for the car!
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Current: 2009 E60 520d "Sport" tractor
Previous: 1989 E30 320i SE
1997 E39 523i
2003 E39 525i Sport Individual
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ian M635UK
Really Senior Member I
Joined: 01-July-2004
Location: United Kingdom
Status: Offline
Points: 264
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Posted: 13-July-2004 at 22:47 |
New engine i.e. rebuilt M635 with rebore new pistons and total seal rings.
Tested warm, throttle wide open, fuel pump disabled, 6 cranks only needed.
220 psi on each cylinder.
Prior to rebuild 180 psi
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Jumbo
Groupie
Joined: 23-April-2004
Location: Ireland
Status: Offline
Points: 96
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Posted: 26-July-2004 at 17:01 |
Killian
Can I ask what your emmission results where so as I can compare to mine..I'll get mine and let you know
I did my NCT in May and had no problems either
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Brian...
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kbannon
Admin Group
E39 525i Sport Individual
Joined: 09-October-2002
Location: 64 Zoo Lane
Status: Offline
Points: 15508
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Posted: 26-July-2004 at 17:26 |
| Eng oil temp: |
85° C |
| Low Idle (750rpm): |
CO |
0.04vol% |
| |
HC |
0ppm |
| High Idle (2510rpm): |
Lambda |
1.011 |
| |
CO |
0.02vol% |
| |
HC |
12ppm |
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Current: 2009 E60 520d "Sport" tractor
Previous: 1989 E30 320i SE
1997 E39 523i
2003 E39 525i Sport Individual
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Jumbo
Groupie
Joined: 23-April-2004
Location: Ireland
Status: Offline
Points: 96
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Posted: 27-July-2004 at 14:35 |
Killian mine are:
| Eng oil temp: |
95° C |
| Low Idle (750rpm): |
CO |
0.35vol% |
| |
HC |
0ppm |
| High Idle (2510rpm): |
Lambda |
1.007 |
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CO |
0.02vol% |
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HC |
17ppm |
Anything I should be looking at i.e CO seems a lot higher than yours
As you can guess I know nothing about engines
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Brian...
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kbannon
Admin Group
E39 525i Sport Individual
Joined: 09-October-2002
Location: 64 Zoo Lane
Status: Offline
Points: 15508
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Posted: 27-July-2004 at 14:40 |
look at the allowed levels written beside these values on your test report. Your engine seems perfect!
I should have added that these results are 'correct' at the time of testing. If you repeated the test an hour later it is possible to get different results.
Edited by kbannon
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Current: 2009 E60 520d "Sport" tractor
Previous: 1989 E30 320i SE
1997 E39 523i
2003 E39 525i Sport Individual
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Jumbo
Groupie
Joined: 23-April-2004
Location: Ireland
Status: Offline
Points: 96
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Posted: 27-July-2004 at 14:49 |
Thanks...I thought it must have been to pass but wasn't sure how close to failing I was..
Is the engine oil temp not a bit high?
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Brian...
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kbannon
Admin Group
E39 525i Sport Individual
Joined: 09-October-2002
Location: 64 Zoo Lane
Status: Offline
Points: 15508
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Posted: 27-July-2004 at 14:55 |
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Not sure about the temp but don't assume their equipment is working 100% either!
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Current: 2009 E60 520d "Sport" tractor
Previous: 1989 E30 320i SE
1997 E39 523i
2003 E39 525i Sport Individual
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dave 328
Really Senior Member II
Joined: 21-October-2003
Location: United Kingdom
Status: Offline
Points: 835
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Posted: 02-August-2004 at 11:17 |
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Oil temp will be around 95 on a fully warm car. Drive it hard and you'll see 120+
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328 Coupe Sport, Digital climate, full leather, OBD computer, De-restricted with M50 manifold, big bore throttle, chippeduk remap, custom cold cone intake and X-brace
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Pozzer6
Newbie
Joined: 22-November-2003
Location: United Kingdom
Status: Offline
Points: 17
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Posted: 03-August-2004 at 22:57 |
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My '97 323i cab shows 180/190 on all six cylinders. Seems good to me as this is probably a Nikosil(?) engine
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Compression test results