- Thread starter DIM
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BarnyardEngineering
Well-known Member
- Location
- Rochester, NY
What tractor and what type of transmission?
On a gear drive you vary your speed with throttle.
On a hydrostatic drive you want to keep your RPMs toward the higher end of the range to maintain flow and pressure to the transmission.
On a gear drive you vary your speed with throttle.
On a hydrostatic drive you want to keep your RPMs toward the higher end of the range to maintain flow and pressure to the transmission.
timcasbolt
Well-known Member
ounds like you're describing my Kubota B7200. In my opinion (for what it's worth) no, running around from here to there under 2000 rpm's won't hurt it at all.
flying belgian
Well-known Member
My 1025 JD 3 cylinder I run about three forths throttle for loader work.
MarkB_MI
Well-known Member
- Location
- Motown USA
Compare the stroke of the new tractor with that of one of those old-school tractors. You'll probably find the new tractor's stroke is only about half that of the old one. Meaning the new tractor has about the same piston velocity at 2500 rpm as the old one has at 1200.
rustred
Well-known Member
how old are you? cause 1200 rpm tractors are from the 1930's. i gear up throttle down in light work like spraying, my 660 is 2400 rpm under load and usually run it at 2100-2200 rpm unless it starts pulling hard. see, who needs a TA on it ,not me. plus i am saving fuel.but since u have a hydro you need to keep it wound up and those use more fuel that the standard tractor.
Blackhole49
Well-known Member
- Location
- White Lake MI
Full speed on all 4 of my compacts is 3200 rpm. I run all of them at full throttle when working. Will drop to 2500 when transporting stuff. About the only time they idle is when I'm off the machines or cooling it down for shutoff.
redforlife
Well-known Member
I worked for a guy one time that had tractors with hydrostat transmissions. He wanted his tractors to be screaming (throttle opened up) when in use. I just did what he said. And drove them with engine screaming, and didn't ask anymore questions.
Aside from the hydro trans issue (which I personally don't run into much), I just run the engine throttle according to the work being done.
Engine under a load and lugging down is not a good thing, in my opinion, just because the operator is being to conservative with the throttle. Better to be running a few extra RPM's over what is needed, than consistently and always less than needed.
And yes, newer engines idle at not much less than what older engines would max out at, when it comes to RPM's. But those older engines would also not rev up as fast as the new ones will. They'd fly to pieces if they had that capability.
Aside from the hydro trans issue (which I personally don't run into much), I just run the engine throttle according to the work being done.
Engine under a load and lugging down is not a good thing, in my opinion, just because the operator is being to conservative with the throttle. Better to be running a few extra RPM's over what is needed, than consistently and always less than needed.
And yes, newer engines idle at not much less than what older engines would max out at, when it comes to RPM's. But those older engines would also not rev up as fast as the new ones will. They'd fly to pieces if they had that capability.
Many of the old school tractors had relatively long stroke engines. I can come up with one that didn't and I've found it interesting to compare with a much newer tractor. The WC Allis Chalmers in its gasoline version had a 4'' bore and a 4'' stroke resulting in 201 cubic inches of displacement. It produced about 30 belt horsepower at 1300 RPM. The Kubota M6800 had a 3.856'' bore and a 4.331'' stroke and 202 cu in displacement. Not very much difference at all. It produced 62 PTO horsepower at 2600 RPM. When considering the probable friction loss on the belt tests these engines were almost identical in size and the later one was able to crank out twice the horsepower at twice the RPM. Allis Chalmers did start cranking up their RPMs to get more horsepower but reportedly ran into vibration issues with some of them. I think the solving of these vibration issues contributed to the modern day high RPM engines which produce much more hp.
Well, the Kubota did use more fuel. 4.16 gph vs 2.861 gph for the Allis. The Kubota was a diesel, Allis a gasser. Both naturally aspirated. Diesel engines are, by nature, more efficient than gas engines. 25-30% or so more efficient and, there was a difference of some 64 years of development between these two tractors. It wouldn't take a whole lot of effort to improve the efficiency of those old engines which was something like 6%.
buickanddeere
Well-known Member
should be operated at anywhere from peak torque rpm to peak HP rpm .
Not saving fuel , engine wear or money by lugging the engine .
Not saving fuel , engine wear or money by lugging the engine .
showcrop
Well-known Member
Almost all diesel engines are controlled by a governor which is controlled by the throttle setting. When the machine takes a load and RPMs dip just a little the governor pulls the rack linkage to increase the amount of fuel being injected, so that the RPMs stay where they are set for.
Geo-TH,In
Well-known Member
Interesting piece of trivia.
All Formula One engines are naturally aspirated V8s with displacements of 2400cc. Engines are restricted to a maximum speed of 18,000 rpm.
Jet engines typically operate in the range of 8,000 RPM to 9,350 RPM (high pressure compressor).
Who would have thunk a F1 engine runs 2X the RPMs of a jet engine?
All Formula One engines are naturally aspirated V8s with displacements of 2400cc. Engines are restricted to a maximum speed of 18,000 rpm.
Jet engines typically operate in the range of 8,000 RPM to 9,350 RPM (high pressure compressor).
Who would have thunk a F1 engine runs 2X the RPMs of a jet engine?
Modern jet engines are confusing when discussing rpm. There are at least 3 different rotational speeds in most. The big fan up front is pretty slow, 2500-4000 depending on size. Second stage compressor is faster, again depends on the model, some around 10k. Power turbine section speeds up, a lot, some up to 20k.
Smaller engines typically turn faster.
Smaller engines typically turn faster.
BarnyardEngineering
Well-known Member
- Location
- Rochester, NY
Not only that but they are smaller displacement.
Destroked 450
Well-known Member
- Location
- Harned, Ky
I d say it depends on what tractor your use to, I grew up in Ford tractors with 540 pto speeds of 18-1900 rpm, 1000 shaft is 2100.
For tooling around I run them at 15-1700 and have low idle set at 800
Small compact tractors operate at a much higher rpm and need to be reved up to maintain proper fluid flow and pressure for their hydrostatic drives
I wouldn t run it below 2000 when puttering around and when working it take it to pto speed and let it run, that s how they designed it to operate
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