Maximum Torque = Maximum Efficiency?
Submitted: Sunday, Feb 05, 2006 at 11:14
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Hi Guys,
Just wondering if anyone can tell me with any authority, if the maximum torque RPM on a Diesel will also yield it's maximum efficiency, without taking into consideration the vehicle speed wind resistance etc. I'm just talking about the engine.
In my case the Patrol 3.0 TD produces maximum torque at 2000 RPM and the auto box always gets the engine sitting around that figure except once you get up to highway speed when it has to go over 2000. To about 2150RPM at 100km/h give or take.
Thanks,
Aaron.
Reply By: Member - Collyn R (WA) - Sunday, Feb 05, 2006 at 15:55
Sunday, Feb 05, 2006 at 15:55
With a typical diesel engine, the answer is generally yes - and many vehicles (the OKA is a superb example, the Nissan TD 4.2 litre is another) are geared such that keeping engine revs around the higher part of the torque curve results in optimum economy.
But this is only a generalisation. There are quite a few diesel vehicles around now that are very highly geared and where peak torque may be above realistic road speeds in top gear.
The query is interesting - but is more relevent to fixed engine-speed applications such as generators, power take offs etc.
Collyn Rivers
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