Posted by RodInNS on May 16, 2011 at 19:17:30 from (216.118.158.123):
In Reply to: turning up a tractor posted by olliekid on May 16, 2011 at 19:02:33:
I don't think there's any one right or wrong answer to that question... I have one turned up approximately 20%. One needs to keep in mind that the same engine I have turned up is run at that same spec in another model of tractor. So that power level is not necessarly harmfull to the engine. Other factors one needs to consider is the cooling capacity... both water and oil. Some have quite a bit of extra capacity built in. Some don't... Other factors are application... If you turned an engine up by 30% and then sent it out to do heavy drawbar work you could probably expect a short engine life, clutch, transmission and rear end problems. The same tractor doing utility work that spreads that power output between the PTO and driveline most of the time so that it's not putting all of the power through one shaft... then that probably would not cause any great harm to the drives. Might still cook the engine tho... Another thing to consider... duty cycle. Are you running it at maximum power all day long or in 3 minute bursts followed by ample time to cool off? I chop silage and haul a lot of manure with mine... and it works hard for 5-10 minutes at most then it has a few minutes to cool while waiting for the truck or it's at least working at reduced load. Many times the manufacturer will rate an engine at a 'continous' power rating and then an 'intermittent' rating that will be somewhat higher. A case in point would be the ISB5.9 Cummins engine in a later Dodge truck. They were rated for something like 350 HP. I expect that would be a very intermittent rating... wheras an N14 Cummins rated at 350 hp would do that continously for a VERY long time. Many factors to consider.
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