8000rpm 5.9 cummins July 29, 2012 04:29AM
i had a guy tell me the other day at a pull that he could turn his 5.9 cummins in his hot farm tractor 8000rpm. is this true could a well put together 5.9 hold together at 8000 or is this guy just full of it, the guys tractor didnt hold together either he made it to about 75ft before it blew but it sounded like he had it wound to about that high, i just didnt see any way that could work running that high of rpm in a hot farm witch i dout its put together well enough to handle that, just wondering if its possable.
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Re: 8000rpm 5.9 cummins July 29, 2012 04:51AM
If I remember correctly I think guys can turn about 6500 out of a 5.9. 8000 sounds a little out of the question if you ask me but I deffinatly don't know everything. Just my 2 cents.
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Re: 8000rpm 5.9 cummins July 29, 2012 05:03AM
65 with billet rods and piston, lightened ncrank and balanced. The best fasteners money can buy aa dry sump oiling.
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Re: 8000rpm 5.9 cummins July 29, 2012 05:52AM
yeah lookin at the tractor i dout they had any of that done i know there was no dry sump oil system on it
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Re: 8000rpm 5.9 cummins July 29, 2012 10:56AM
You would have to run about a million degrees of timing advance on the injection pump to get a compression fired engine to run there. 8000 is a long way from 6500.
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Re: 8000rpm 5.9 cummins July 29, 2012 02:43PM
Maybe he had 2 magnets on his flywheel to trigger the tach instead of one???? 8000 rpm sounds like a "Fish story"" to me.
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Re: 8000rpm 5.9 cummins July 29, 2012 02:56PM
Don't most hot farm classes have a 3000 rpm limit? MACK
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Re: 8000rpm 5.9 cummins July 30, 2012 04:36PM
he had his tach on metric lol Europe is the only place ive ever seen diesel tractors anything close and i mean maybe 7000 rpm but they service them like a top fuel, one run and a complete tear down , pumps turbos, engine , rebuild and do it again. fun?
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Re: 8000rpm 5.9 cummins July 31, 2012 12:13AM
Is it in a 756 from Kansas?
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Re: 8000rpm 5.9 cummins July 31, 2012 01:47AM
the 756 dont turn that many. but they do wind it pretty tight i will say that
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Re: 8000rpm 5.9 cummins August 02, 2012 08:06AM
It does turn some rpm for a 5.9, however the only times it has gone over 7k has been with a stuck plunger a few times.

Why someone would suggest a lighter crank for higher rpm operation I'm a little unsure? These aren't drag racing engines...
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Re: 8000rpm 5.9 cummins August 02, 2012 09:54AM
those guys in the LLSS classes cant turn that much
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Re: 8000rpm 5.9 cummins August 02, 2012 02:31PM
The guy that built the engine in the 756 told me in the gas station one night that it made 1700 horse, 138 pounds of boost, and they were spinning a 5" charger and turned 8000 rpm with a stock bottom end. I told him I didnt just fall of the turnip truck and walked out.
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Re: 8000rpm 5.9 cummins August 02, 2012 03:09PM
yeah it was the black 756 ive heard he tells that to alot of people
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Re: 8000rpm 5.9 cummins August 03, 2012 12:59AM
1700hp is pretty poor from a 5" charger.
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Re: 8000rpm 5.9 cummins August 03, 2012 06:35AM
We do it with a 301 AC , nothing stock at all everythings perfectly balanced and is perfectly set ; it will come apart one of these days but for now its a screamin lil engine
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Re: 8000rpm 5.9 cummins August 03, 2012 07:00AM
On diesel?
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