Posted by B-maniac on January 06, 2014 at 17:06:45 from (75.133.242.247):
In Reply to: HP vs Cu. In. posted by Texasmark1 on January 06, 2014 at 14:04:46:
I prefer to use the phrase "duty cycle" even tho it is probably more applicable to electric motors the principal is the same. A Case 1070 has 451 cubes to make 110 hp. Came out in early '70,s and still farming strong today. OK so take the same 110 hp only produced from a 110 cid engine ( 1 hp per cu in ) which would more than likely take a turbo and turn 3500-5000 rpm to do it and tell how many would even make it ten years let alone 40 or 50 yrs. Farming / farmers neither one lend theirselves very well to the "throw away" theory in machinery. There were approx. 100,000 late styled JD "B",s built from '47-'52. If you take out for abuse or neglect I would bet there are still 25000 left today that are still capabable of farming with. 190 cid making 27 hp at 1000-1200 rpm. See how many of todays 27 hp "yard rancher" tractors are alive even 15 yrs from now. And they aren't used all day long in the field either. So if you want a 40 yr "duty cycle" so to speak then you surely don't want 1 hp per cu in or any where near it or the compression/rpm and /or turbocharging it takes to get it. Remember . he's talking tractors here or at least that's how I read it.
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