Posted by Indiana Ken on December 18, 2011 at 17:59:49 from (66.249.233.66):
In Reply to: Horsepower ratings posted by MN Scott on December 18, 2011 at 11:34:58:
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No, the the above summary is not completely accurate. 1) Since the air is less dense at 5000 ft, the compression ratio can be increased to regain some of the power which is lost due to the reduced air density. However, the tractor's HP will still be less than it's counter part operating at sea level. 2) At sea level the higher compression tractor will make more HP than the standard compression counter part however I would expect the difference to be more in the range of 5% rather than 14%. To increase power by 14% would require a drastic increase in compression ratio. 3) As noted by another poster higher octane fuel may be required when operating the high compression tractor at sea level due to the increased air density as compared to 5000 ft.
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