The general rule is a peak of around 1 ft lb for every cubic inch, give or take. (That number has not changed appreciably since the beginning.) A 450 size car engine generally makes 500 or so etc. Old tractors tend to be in the ball park (usually less) but peak out down around 800 to 1000. The old machines just turned sooo ssslooow... Getting the RPM up to make useful power is an ongoing struggle, but nowadays usable rpm seldom goes over 2500 for efficiency reasons.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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