Compression - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 04-14-2005, 09:53 PM
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Ok i went and had my car check out the other day and got all my fluids changed (everything) and changed my spark plugs to. I asked the mechanic to do a compression check while he was working on my car. For some odd resone i dont think he did it but here is what he said. (Front to back) 173, 173, 173, 170, 170, 175. Dose these numbers look about right? And also what are the cylinder numbering order.
thanks in advance.

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#2 (permalink) Old 04-14-2005, 09:56 PM
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sound perfect... they're all within 10lbs of each other which is what an engine is supposed to be doing. means the cylinders are aging correctly and you'll have a ton of life left in them :P

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#3 (permalink) Old 04-14-2005, 10:07 PM
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Quote:
Originally posted by jrhaile@Apr 14 2005, 06:56 PM
sound perfect... they're all within 10lbs of each other which is what an engine is supposed to be doing. means the cylinders are aging correctly and you'll have a ton of life left in them :P
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#4 (permalink) Old 04-15-2005, 12:12 AM
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what are you guys compression numbers and milage? just courious to see whats other cars are running.

<span style='font-family:Times'>1994 325is 5-speed 129,000 and strong</span>

<span style='font-family:Times'>Conforti Cold-Air Intake Kit</span>
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#5 (permalink) Old 04-15-2005, 08:44 AM
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What is compression?...which numbers are good? which are bad? How do you check?

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#6 (permalink) Old 04-15-2005, 02:29 PM
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Quote:
Originally posted by benji84@Apr 15 2005, 01:12 AM
what are you guys compression numbers and milage? just courious to see whats other cars are running.
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1992 325i w/ 170,000
205, 195, 200, 210, 200, 205
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#7 (permalink) Old 04-15-2005, 03:34 PM
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Hehe... last week checked mine:

203, 203, 203, 87, 72, 145.

So as you can figure already, tore my engine apart. Piston rings were almost gone, sixth cylinder wall had a scrape, valve gaskets (don't know if that's the right expression) were dead, valves need work etc.

As the engine has already been torn apart I decided to port my engine head while I'm at it already.

The interesting thing is that a week before I did the compression test I dynoed my car and it produced 182hp and 162lb-ft of torque... that's normal for an engine that is 14 years old... but taking into account the shape it was in, I'm surprised

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#8 (permalink) Old 04-15-2005, 07:51 PM
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hmmm, seems like mine are a little lower then normal, what do you guys think?

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<span style='font-family:Times'>Conforti Cold-Air Intake Kit</span>
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#9 (permalink) Old 04-15-2005, 07:58 PM
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All of mine are in the low 70s.... yours are normal... and jrhail... If I'm not mistaken.. all the values should be within 85% of the highest value.. per BMW manuals... haha...

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1997 E36 M3 1990 E30 325i
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#10 (permalink) Old 04-15-2005, 08:16 PM
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whatever! :P

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#11 (permalink) Old 04-15-2005, 09:41 PM
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What should they be when the car first rolls of the assembly line?

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