Posted by RodInNS on October 24, 2014 at 10:58:47 from (216.118.158.123):
In Reply to: drawbar vs engine posted by mb58 on October 24, 2014 at 07:39:17:
Gross engine power is always the largest number followed by net flywheel hp... and the numbers that manufacturers use vary between those two today... Both are really quite meaningless because neither one considers the parasitic loss in the drivetrain. I would say on most tractors in the 60-100 hp class... PTO power will be in the 85% range of net flywheel power. Drawbar power will be in the low-mid 70% range. On the lower end for bias tires and on the upper end for radial tires with an easy 2-3 point spread between them on the same tractor. Personally I just laugh at net flywheel numbers because they don't mean anything. I can show you tractors that have a 10% margin on net flywheel power that make the same drawbar power due to drivetrain efficiencies in on over the other. The gap is not so wide with PTO power but it's still there... I don't take Nebraska or OECD numbers as the be all, end all of tests either... but when interpreted for what they show they are quite meaningful. The main area that I think they err somewhat is in the fuel efficiency numbers... in that while they do show which is most efficient at maximum power they do not necessarily mimic real world usage conditions where the torque curve of some engines will result in a lower gph consumption rate for a particular job even though the full power efficiency is somewhat less...
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