Re: 1940 Farmall M --runs good but low horsepower.

Posted by captaink on December 13, 2005 at 08:47:10 from (66.115.214.56):

In Reply to: 1940 Farmall M --runs good but low horsepower. posted by TYE W on December 12, 2005 at 10:46:26:

A compression test is a good place to start. Depending on pistons (flat or stepped) and the head on your engine (kerosene, gasoline, or propane) the compression could range between 90 and 140+ psi. Even compression (within 10% of each other) means that there is even wear on the cylinders and even valve sealing. Fuel mixture and timing can affect horsepower dramatically as well as valve clearance. If you pull the valve cover to check the clearance, look for a casing number on the top of the head, this will tell you what head you have. Then some of the other gurus here can tell you more accurately what kind of compression pressure you can expect. The engine might have super M pistons but an old low compression kerosene head.

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