Re: Displacement/engine speed/HP

Posted by AD on August 30, 2000 at 10:32:48 from (204.180.108.171):

In Reply to: Displacement/engine speed/HP posted by John Hallman on August 30, 2000 at 06:56:00:

I know this is not in the same class but the same principle. The Diesel engines in railroad locomotives have a top speed of 950 rpm(HP rating from 1500-3000 depending on number of drive motors) and they run for 30 days at a time before being shut down for monthly inspection. They turn a 600 VDC generator and this in turn powers the drive motors. These engines are only shut down once per month for some inspection then started back up. It may be a year before they are shut down for any maintance to be did on them.Out of a 24 hour day the engine will be running at max load for 20 hours on the average. I believe the big and slow beats the fool out of small and fast.Still not convinced that the wear factor don't increase with the increased RPM. Most of the engines in tractors or mowers today need major repair in under 5 years if worked anywhere close to Max load for any extended time.The big and slow was what made the Diesel favored over gas years ago and I still think it applies.

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