Ft lbs x rpm/5252 =Horsepower. In answer to your question in theory yes, in practice no. You can use a smaller engine turning at more RPM and gear it down to get torque but the gearing to reduce the speed has some parasitic loss, you go to small and the gearbox eats all of your power. If you want to see how this has been applied look at farm tractors from the late 40's early 50's and compare them to the tractors of the late 50's early 60's FROM THE SAME MANUFACTURER, you'll see in many cases engines that are the same size and remarkable similar to the earlier engines putting out more power by simply turning faster, or in the case of John Deere large 2 cylinder engines that from the letter (A,B,G and R) to the first number series (50,60,70 and 80) get slightly smaller in displacement with a bump in RPMs, the next number series (520,620,720,and 820) more rpms, last 2 cylinder series (530,630,730 and 830) not much power change other tractor changes meant more work or more comfort, then look at the new generation tractors (2010,3010,4010) Smaller engines with more cylinders turning faster. The folks at IH did kind of the same thing the H sized tractor in the number series grew into a three plow tractor, The M sized tractor into a 4 or 5 plow tractor
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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