Posted by Bob M on April 29, 2011 at 18:41:32 from (67.240.171.41):
In Reply to: fuel posted by Finnbair2020 on April 29, 2011 at 17:27:16:
Depends on how you define “efficiency”.
One measure of efficiency is work performed per gallon of fuel consumed. And Nebraska Tractor test data is a good way to make comparisons:
The Nebraska test for the Cub (#575) shows the Cub good for 9.38 hp-hr/gallon. However the test for the H (#333) yields 11.59 hp-hr/gallon. In other words you can expect 24% more work from a gallon of gas burned in an H than from a gallon burned in a Cub. (This incidentally is about what you’d expect: The Cub engine is a low compression side valve (flat head) design vs the H’s more efficient overhead valve layout.)
HOWEVER...to your example with both tractors mowing - which would have the Cub working a full load but the H just loafing - I suspect the fuel consumed per acre would be about same for either tractor.
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