[AT] [Farmall] Super M Fan Belt -- and other fun stuff

[Cecil Bearden]

That would be about right for a 9:1 compression ratio.  I don't know what 
the stock cr is.
Cecil in OKla
----- Original Message ----- 
From: <drupert at seanet.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, September 19, 2010 11:42 AM
Subject: Re: [AT] [Farmall] Super M Fan Belt -- and other fun stuff


> ...
> The other surprise was the compression--I'd taken the spark plugs out to
> make it easy to turn the engine over to get that fan belt on, so as long
> as they were out I got out the compression tester.  On my '50 M the four
> cylinders had tested at 115, 118, 90, and 105 psi, which as I recall folks
> here on the list had said was okay for an old light-use tractor.  This SM
> is in a lot better shape so I was expecting higher numbers, but not what
> the tester showed:  180 psi, 175, 178, and 175.  High-altitude pistons?
>
> What's a normal range for an SM?
>
> Dean Vinson
> Dayton, Ohio
> www.vinsonfarm.net
> ...
>
> Dean,
>
> I don't know the answer to your' question but I'd like to as well.  I know
> on the SH I had rebuilt several years ago now the compression, as taken
> this past Spring, was 112, 115, 110 & 110.  On the SM I bought this past
> Summer it measured (soon after I got it home) 100, 85, 90 & 90.
>
> Your' readings are sure consistent and high - I guess for one of these
> older low to medium compression engines I am surprised you'd get a reading
> that high.
>
> Dudley
> Snohomish, WA
>
>
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