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compression value

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mini_me

Post subject: compression value

Posted: Thu Jan 12, 2006 5:02 pm

848cc

Joined: Fri Jul 30, 2004 4:48 pm
Posts: 226
Location: Sydney

Does anyone know the compression value of a 998 engine.
I'm getting 71 psi on the first stroke and a final reading of 138 psi on all the cylinders.
thanks Felix

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1970 mgb roadster auto
1970 cooper S mk2
1976 mini S
1964 wolseley 24/80
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JAM_IT

Post subject:

Posted: Thu Jan 12, 2006 6:46 pm

998cc

Joined: Fri Jan 06, 2006 9:11 pm
Posts: 1016
Location: SYDNEY

That's a bit low.....

JAM was getting 165 prior to recent rebuild.

My $100 special 77 Clubby is getting 155 and runs well enough.

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mickmini

Post subject:

Posted: Thu Jan 12, 2006 7:03 pm

1275cc

Joined: Mon Apr 26, 2004 6:31 pm
Posts: 4663
Location: Sydney - strangely, I am glad of the sight of hills!!

but at least it is worn out evenly

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Morris 1100

Post subject:

Posted: Thu Jan 12, 2006 8:01 pm

Causing or creating vexation

Joined: Wed Jul 21, 2004 10:32 pm
Posts: 19124

My 1100 is getting 125 on all four. I know it is low but at least it is constant (and has been for seven years)

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mini_me

Post subject:

Posted: Fri Jan 13, 2006 5:17 am

848cc

Joined: Fri Jul 30, 2004 4:48 pm
Posts: 226
Location: Sydney

Do you guys recommend I get the head reco and check the pistons
or just leave it as is.
Felix

_________________
1966 mustang coupe 289 auto
1970 mgb roadster auto
1970 cooper S mk2
1976 mini S
1964 wolseley 24/80
http://s160.photobucket.com/albums/t173/1966mini/

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mini_me

Post subject:

Posted: Fri Jan 13, 2006 6:20 am

848cc

Joined: Fri Jul 30, 2004 4:48 pm
Posts: 226
Location: Sydney

the compression values i obtained were taken with the engine cold as there is no manifold on the engine.would a cold engine cause the low values

_________________
1966 mustang coupe 289 auto
1970 mgb roadster auto
1970 cooper S mk2
1976 mini S
1964 wolseley 24/80
http://s160.photobucket.com/albums/t173/1966mini/

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JAM_IT

Post subject:

Posted: Fri Jan 13, 2006 7:37 am

998cc

Joined: Fri Jan 06, 2006 9:11 pm
Posts: 1016
Location: SYDNEY

Yes, I believe you are supposed to do it WARM.

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mini_me

Post subject:

Posted: Fri Jan 13, 2006 9:07 am

848cc

Joined: Fri Jul 30, 2004 4:48 pm
Posts: 226
Location: Sydney

thanks all,
i will do the compression check again once i change the side cover gaskets and exhaust/inlet manifold gaskets.
next job on the 76 clubman S is welding a patch on the drivers side kick panel and getting seats re upholstered.
Felix

_________________
1966 mustang coupe 289 auto
1970 mgb roadster auto
1970 cooper S mk2
1976 mini S
1964 wolseley 24/80
http://s160.photobucket.com/albums/t173/1966mini/

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JAM_IT

Post subject:

Posted: Fri Jan 13, 2006 9:21 am

998cc

Joined: Fri Jan 06, 2006 9:11 pm
Posts: 1016
Location: SYDNEY

mini_me wrote:

and getting seats re upholstered.
Felix

Go see my trimmer. Might be a bit of a hike for you...but he does have all the original clubby cloth (no more black though

)

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mini_me

Post subject:

Posted: Fri Jan 13, 2006 1:51 pm

848cc

Joined: Fri Jul 30, 2004 4:48 pm
Posts: 226
Location: Sydney

Hi Anton,
can you give me the details of your trimmer.
I only need the front seats redone in the original bone coloured material
thanks Felix

_________________
1966 mustang coupe 289 auto
1970 mgb roadster auto
1970 cooper S mk2
1976 mini S
1964 wolseley 24/80
http://s160.photobucket.com/albums/t173/1966mini/

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JAM_IT

Post subject:

Posted: Fri Jan 13, 2006 2:12 pm

998cc

Joined: Fri Jan 06, 2006 9:11 pm
Posts: 1016
Location: SYDNEY

done

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Post subject:

Posted: Fri Jan 13, 2006 7:22 pm

998cc

Joined: Sun Sep 11, 2005 12:41 pm
Posts: 911
Location: Bunbury WA

mini_me wrote:

the compression values i obtained were taken with the engine cold as there is no manifold on the engine.would a cold engine cause the low values

A cold engine will give higher values ...so when hot it will be significantly lower l

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1965 Morris 850
1966 Morris Mini Minor
1967 Morris Cooper 'S'
1977 Leyland LS

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tainted

Post subject:

Posted: Fri Jan 13, 2006 9:31 pm

848cc

Joined: Thu Sep 29, 2005 9:16 pm
Posts: 77
Location: Upper Ferntree Gully, Vic

A relativly chick check is to put a small bit of machine oil down the plug hole and do a wet test, if compression improves, shows a very worn engine.

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If in doubt ask

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hutto

Post subject:

Posted: Fri Jan 13, 2006 9:37 pm

998cc

Joined: Mon Jan 31, 2005 6:11 pm
Posts: 655
Location: South Aussie

i have high compression on mine 210 psi

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