That's right, Clausager says that North American 18V engines were
standardized at 8:1 (home market high compression was 9:1).
(BTW I'm sorry if I am becoming a bore with this "Clausager says" stuff
but I just read the book straight through so it's fresh in my mind, as it
were. I just look it up for verification before posting.)
teds had this to say:
>I am under the impression that all later model mgb's in the US are 'federal'
>or 'california' and are low compression engines. I may be mistaken but 9 to
>1 sounds pretty high for a US late model.
>
>----- Original Message -----
>From: Skye Poier <skye@ffwd.com>
>> Word on the street is that stevejp2@juno.com 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?
>>
>> http://www.mgb.bc.ca/reference/specs.html
>>
>> Compression:
>> 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.
>>
>> Skye
--
Max Heim
'66 MGB GHN3L76149
Runs great,
looks particularly bad since some SUV clown backed into it.
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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