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SuperClubby
PostPosted: Sat Jun 05, 2010 12:48 pm 
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848cc
848cc

Joined: Fri Jun 26, 2009 9:45 am
Posts: 11
Hi guys

I drive my mini as a every day car and my 1100 has had a major failure. i have a spare 998 engine which i intended to put in. the problem is when i tested the compression it had mixed readings:
1: 120psi
2: 120psi
3: 100psi
4: 140psi

with the wisdom and knowledge on this mini forum, could someone possible be able to tell me how this will run or if it should even be used? because from a engineering perspective usually rings wear evenly hence the readings should be near even.

cheers guys
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Harley
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PostPosted: Sat Jun 05, 2010 1:00 pm 
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1360cc
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Joined: Mon Aug 23, 2004 10:07 pm
Posts: 10654
Location: SE Melbourne
It's not always the rings that are the leaks remember: If you have a crook head gasket that could be a problem too.
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GT mowog
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PostPosted: Sat Jun 05, 2010 1:21 pm 
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Joined: Fri Oct 03, 2008 9:02 pm
Posts: 5079
If you got those numbers by 'bench test'they are not much good. Engine needs to be at or near operating temp to get meaningful numbers.

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drmini in aust
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PostPosted: Sat Jun 05, 2010 1:52 pm 
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religious status
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW
Harley wrote:
It's not always the rings that are the leaks remember: If you have a crook head gasket that could be a problem too.

Valves may not be seating equally well either, and as GT m says I'd run it until warm, then retest.

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headgasket
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PostPosted: Sat Jun 05, 2010 3:22 pm 
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848cc
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Joined: Thu Feb 14, 2008 3:25 pm
Posts: 258
Location: Bathurst, NSW
Don't forget to keep the butterflies wide open and reset the gauge after each cylinder!

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Convertible Mini
 Post subject: Location
PostPosted: Sat Jun 05, 2010 3:51 pm 
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1275cc
1275cc

Joined: Thu Dec 09, 2004 6:57 am
Posts: 3022
Location: JIMBOOMBA QLD.
What is your location ???

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