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Tractor Talk Discussion Board |
Re: What exactly makes a diesel smoke under a load
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Posted by RodInNS on August 25, 2006 at 05:44:48 from (142.177.81.202):
In Reply to: Re: What exactly makes a diesel smoke under a load posted by massey333 on August 25, 2006 at 05:18:05:
Loading and parasitic power loss. The old tractors were just basic gear drive units. They had a relatively high efficiency in their gear trains. Newer units have power shift units, more weight... more moving parts. It all takes power to turn.
The other big factor, and probably the biggest factor..... is hydraulic pumps. An old tractor might pump 5 gpm for the main system, and a couple more for the power steering. Tractors today, depending on the size, could be pumping 20 plus for a small utility, and handy 70 gpm on the large row crops. It takes power to move oil. Many of the "newer" tractors, from the 80's and 90's are a lot heavier than the old tractors too, so that takes power to drag around.
However, if you look at the Nebraska tests on many of these tractors, they are more efficient than the old engines. Their specific fuel consumption at rated power, in some cases is probably half what many tractors were during the 50's. There are exceptions, but that would be the general rule..... Rod
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