Posted by MarkB_MI on July 12, 2010 at 19:46:20 from (166.217.150.135):
In Reply to: horsepower again??? posted by dave2 on July 11, 2010 at 13:30:02:
You don't say which models you're looking at, but I found this document on the Case-IH site. The Farmall 40, 45, 55 and 60 models all share a 135 cid engine. But their engines are rated at 40, 45, 55 and 60 horsepower respectively. What gives?
First, note that the 55 and 60 have turbocharged engines. So they really don't have the "same" engine as the naturally aspirated versions, even if the engine internals are identical. The turbo'ed engines may have different pistons and camshaft from the NA, you'd have to compare parts lists to know for certain.
Next, note that the 50 and 60 are rated at 2800 rpm, while the 45 is rated at 2600 and the 55 at 2700 rpm. Remember that power is simply the product of torque times rpm, so if you turn an engine faster it makes more horsepower assuming the torque is constant. Again, there may or may not be internal differences in the engines.
The last thing I noted is the PTO horsepower. Taking the 45 versus 50 as examples, the 45 is rated at 35 PTO hp while the 50 is rated at 40. So either the gearing is different for the PTO (which would make the 50 turn faster engine rpm at 550 PTO rpm), or the 50 is putting out more torque at the same rpm as the 45.
Which to buy? Unless you have an application (such as plowing) where horsepower is important, buying a less powerful tractor is probably the way to go. You're getting the "same" tractor for less money.
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