[s-cars] RE: Engine Compression Test (Hot or Cold?)

[James Murray (LMC)]

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Old topic I know, but I said I would post the results of testing the compre=
ssion on my engine hot (which I did over the holidays) versus when I tested=
 it cold in November. Much to my suprise I found neglible difference in com=
pression. Hot or cold I got consistant 11 to 11.5 bar on all 5 cylinders.

Cheers, /James.

	-----Original Message-----
	From:	Igor Kessel [SMTP:igor at s-cars.org]
	Sent:	November 25, 2002 10:10 AM
	To:	James Murray (LMC)
	Subject:	Re: [s-cars] RE: Engine Compression Test (Hot or Cold?)

	> "James Murray (LMC)" wrote:
	>
	> So can I assume higher numbers with a warm engine? Or completely
	> different results?

	Prolly will be completely differend. Faster spinning warm engine on one
	hand, a better gap sealing with the cold oil on the other.

	--
	Igor Kessel
	two turbo quattros

> -----Original Message-----
> From:	Fred Munro [SMTP:munrof at sympatico.ca]
> Sent:	November 25, 2002 7:49 PM
> To:	Igor Kessel; James Murray (LMC)
> Cc:	s-car-list at audifans.com
> Subject:	RE: [s-cars] RE: Engine Compression Test (Hot or Cold?)
>
> To add to Igor's excellent advice, crank the engine until the compression
> reading no longer increases. If you don't crank long enough, you'll get
> variable, low readings.
>
> Fred Munro
> '94 S4
>
>
> -----Original Message-----
> From: s-car-list-admin at audifans.com [mailto:s-car-list-admin at audifans.com=
]On
> Behalf Of Igor Kessel
> Sent: November 25, 2002 10:05 AM
> To: James Murray (LMC)
> Cc: 's-car-list at audifans.com'
> Subject: Re: [s-cars] RE: Engine Compression Test (Hot or Cold?)
>
>
> "James Murray (LMC)" wrote:
> >
> > This message is in MIME format. Since your mail reader does not underst=
and
> > this format, some or all of this message may not be legible.
> > --
> > [ Picked text/plain from multipart/alternative ]
> > Meant to have the subject say "Hot or Cold"
> >
> >                 -----Original Message-----
> >                 From:   James Murray (LMC)
> >                 Sent:   November 25, 2002 9:44 AM
> >                 To:     's-car-list at audifans.com'
> >                 Subject:        Engine Compression Test (Warm or Hot?)
> >
> >                 Does a compression test need to be done while the engine
> is warm? Or can it be done while cold?
> >
> >                 I did one while the engine was cold and got a fairly
> consistant 11 or 11.5 bar on all 5 cylinders. Specifications are between 9
> Bar and 13 Bar and the wear limit is supposed to be 7 Bar, while max
> difference between cylinders is 3 Bar.
> >
> >                 Just wondering if I need to re-run the test to ensure I
> got valid data?
> >
> >                 Cheers, /James
> > _______________________________________________
> > S-CAR-List mailing list
> > S-CAR-List at audifans.com
> > http://www.audifans.com/mailman/listinfo/s-car-list
>
> Warm engine, injectors disconnected, all spark plugs removed, throttle
> wide open.
>
> --
> Igor Kessel
> two turbo quattros
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