Posted by IH fan on May 06, 2009 at 02:32:49 from (69.148.147.114):
In Reply to: Horse power? posted by BruceS. on May 05, 2009 at 04:55:53:
Hugh MacKay said: (quoted from post at 03:17:23 05/06/09) Butch: I don't have the Nebraska tests with me however I do remember the Farmall 350 having the smallest gap between PTO and Drawbar horsepower of all tractors tested at Nebraska up to 1958. I also remember one or two of gas, diesel or LP gas made it over 40 hp on PTO. Drawbar on that same unit was 37-38, just about unheard of in 1958.
That probably hasn't changed much in the past 50 years, 350 could still be the leader, due to the fact that tractors since have power everything.
How's this? Some of the data does not make sense to me because why is there a difference in the percentage of HP loss from belt/pto/db from one fuel to another, unless there is a difference in the gear ratios for the different fuels?
Nebraska Tractor Test 609:
Test Date: March 1957
Engine: diesel
Belt (max): 38.65 hp [28.8 kW]
PTO (rated eng speed): 34.28 hp [25.6 kW]
PTO fuel use (rated): 14.48 hh/g [2.9 kWh/l]
Drawbar (max): 27.76 hp [20.7 kW]
Test report: PDF file
Nebraska Tractor Test 611:
Test Date: April 1957
Engine: gasoline
Belt (max): 39.31 hp [29.3 kW]
PTO (rated eng speed): 36.21 hp [27.0 kW]
PTO fuel use (rated): 11.66 hh/g [2.3 kWh/l]
Drawbar (max): 28.76 hp [21.4 kW]
Test report: PDF file
Nebraska Tractor Test 622:
Test Date: May 1957
Engine: LP gas
Belt (max): 39.34 hp [29.3 kW]
PTO (rated eng speed): 36.36 hp [27.1 kW]
PTO fuel use (rated): 9.36 hh/g [1.8 kWh/l]
Drawbar (max): 30.07 hp [22.4 kW]
Test report: PDF file
This post was edited by IH fan at 02:37:19 05/06/09.
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