Have we been doing it wrong? High rpm's bad when not needed?

[5030]

I see Coleman's offers new substrate cannisters for sale but again, extinguishing the light fall to a dealer with the correct diagnosis tools, IOW the updated Diagmaster.

 

[5030]

I run older tractors mostly. I still do not use higher RPMs because among other things its the best way for a diesel engine to rip out a clutch under a load.....

Not gonna happen ever with a properly tensioned pressure plate but a mal adjusted clutch can certainly have the facings removed and will slip.

 

[5030]

The weakest link on your tractor by far is the transaxle (especially if its HST). Engines almost always exceed the life of the tranny.

High rpms do NOT hurt an engine at all but lowers the torque put on the engine and transaxle components. High torque is what wears and breaks tractors. So error toward higher rpms for longer tractor life.

I totally disagree with your comment for so many reasons it would take pages to list them. Suffice to say, you are dead wrong.

 

[dadohead]

I totally disagree with your comment for so many reasons it would take pages to list them. Suffice to say, you are dead wrong.

That's OK... we can disagree. My comments come from a 30 year career as a tractor engineer. I know what drives high strain on gaged machines (both in the field and lab tests), failure modes at end of life, and exactly how it all relates to warranty. It's also basic engineering:

Power = torque × rpm

As rpm goes up.... torque goes down as does wear and breakage. Best to error running a little faster for longest tractor life.

 

[Yander]

That's OK... we can disagree. My comments come from a 30 year career as a tractor engineer. I know what drives high strain on gaged machines (both in the field and lab tests), failure modes at end of life, and exactly how it all relates to warranty. It's also basic engineering:

Power = torque × rpm

As rpm goes up.... torque goes down as does wear and breakage. Best to error running a little faster for longest tractor life.

Why you only have 104 posts to date. How could you possibly be right and 5030 with his 25,000+ posts be wrong?

Better prepare yourself for all the "pages" of reasons you are wrong!

 

[LouNY]

That's OK... we can disagree. My comments come from a 30 year career as a tractor engineer. I know what drives high strain on gaged machines (both in the field and lab tests), failure modes at end of life, and exactly how it all relates to warranty. It's also basic engineering:

Power = torque × rpm

As rpm goes up.... torque goes down as does wear and breakage. Best to error running a little faster for longest tractor life.

With over 60 years of running and repair tractors this is not the first time I have heard this and not the first time I have shrugged it off as bull.
It may be somewhat true on gas powered lawn tractors but I doubt it even there.

 

[Hoobie]

Why you only have 104 posts to date. How could you possibly be right and 5030 with his 25,000+ posts be wrong?

Better prepare yourself for all the "pages" of reasons you are wrong!

???

 

[DarkBlack]

The weakest link on your tractor by far is the transaxle (especially if its HST). Engines almost always exceed the life of the tranny.

High rpms do NOT hurt an engine at all but lowers the torque put on the engine and transaxle components. High torque is what wears and breaks tractors. So error toward higher rpms for longer tractor life.

This is all pretty debatable. Another thread or two maybe

 

[DarkBlack]

As rpm goes up.... torque goes down as does wear and breakage.

Not necessarily.
Totally dependent on the load % put on the engine.
At, say, a full 100% load, the torque increases as rpm’s go up, until you cross the rpm of maximum torque. Only then, does torque start decreasing with increasing rpm’s as you stated.

 

[DarkBlack]

I own 2008 tractor, so it doesn’t have the ridiculous emissions junk on it, but I’m following this thread because I’m interested in anything ICE related.

One question I have for those unfortunate with the newer regen requirements…has anyone tracked diesel gallons between regenerations, instead of hours?
Running only required rpm’s uses less fuel. I’m guessing, even if the regeneration interval is shorter, I bet it’s at the same amount of fuel burned, or even less.