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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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