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Re: Compression

Subject: Re: Compression
From: Skye Poier <>
Date: Thu, 22 Apr 1999 18:44:14 -0700
Word on the street is that said:
> I am going to check out a 79 MGB that I am interested in buying tomorrow
> and I can not find the values I should get in a compression test
> anywhere.  Off to get a Haynes manual later.  Does anyone have an idea
> what the compressions should be?

18G engines, 8.8:1, 160psi @ 275rpm
18V engines, 9.0:1, 170 - 195psi @ 275rpm

Assuming the compression ratio is stock.  Pull all the plugs before
you check, btw.  Might want to adjust the valves too.

FYI my '66 B gets about 145-150 psi and runs very well.

Low readings in both cyl 2 and 3 generally point to blown head gasket (cheap)
or cracked head (expensive).  Usually accompanied by clouds of white
smoke from the tailpipe.


1966 MGB        The MGB Experience         __,__\__      Safety Fast!
GHN3L-70307     (_o____o_)     MGOFR 1.375

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