Wide Open Throttle

[sandman2234]

My statement was made considering the use of full horsepower from an engine, and if you need just a little more horsepower, will it help to run WOT.
If your already running at max torque/horsepower, by the plotted curve, and you merely increase rpm, it doesn't help anything. However if your running an item that is rpm sensitive, such as a pump, an increase of rpm might help, provided the peak output of the pump hasn't been achieved. Since a loader is rpm sensitive due to the pump output, it doesn't apply to what I was thinking, wether or not I explained it that way.

Bottom line, the faster you throw heavy metal objects up and down, the harder it is on the bearings that absorb that force and the faster metal fatigue will affect it.
Probably won't make a difference to any of you WOT people, but that is my thoughts, and I'm sticking to running at less than WOT.
David from jax

 

[KICK]

Unless you run an HST.
Bob

WTF is a HST?

is there a glossary of Tractorby Net terminologies that I can aquaint myself with before posting?


there is a term used in Engineering called BMEP, or Brake Mean Effective Pressure. generally you will find that any engine produces the most power with the least amount of fuel used at that certain RPM point.

that point where the most efficient BMEP occurs just happens to coincide with peak torque RPM.

go figure?

 

[KICK]

in other words, at peak torque RPM, you get the most with the least

 

[Doc_Bob]

WTF is a HST?

Hydrostatic transmission = HST.
Bob

 

[Soundguy]

WTF is a HST?
is there a glossary of Tractorby Net terminologies that I can aquaint myself with before posting?

While there may be a few TBN specific phrases and such, HST falls outside of this site, and rather into 'general' tractor terminology.. etc.

Doc_bob gave you the working definition.. etc.

Soundguy

 

[KICK]

While there may be a few TBN specific phrases and such, HST falls outside of this site, and rather into 'general' tractor terminology.. etc.

Doc_bob gave you the working definition.. etc.

Soundguy

makes sense. thanks

 

[ozzie tractor]

the reason an engine gets its best fuel economy at peak torque is because thats where it is most efficient. as the efficiency goes up on a motor the only thing it will do is create more torque.
bear in mind torque is a twisting force. 1 of only 2 things an engine can do.this is the amount of twist it can create at the crank. simply it is how hard a engine can pull. the other thing an engine does is rotate the crank at speed.
Horse power is a RATE of work, that is how much work is done in a set time, it is a mathematical equation which includes the amount of torque a motor produces and also the rpm of the motor.
diesels are unique in the fact if you are using 40hp they will use 40hp worth of fuel. if the efficiency of a 50hp and a 80hp motor are the same, at 40hp they will use the same fuel. just remember efficiency drops as rpm increases past peak torque. so if you have to rev the 50hp motor hard to make the hp required then its efficiency and thus fuel economy will suffer

 

[KICK]

the reason an engine gets its best fuel economy at peak torque is because thats where it is most efficient.

isn't that saying the same thing twice?

doesn't explain why its most efficient at that point, just says that it is.

 

[Doc_Bob]

the reason an engine gets its best fuel economy at peak torque is because thats where it is most efficient. as the efficiency goes up on a motor the only thing it will do is create more torque.
bear in mind torque is a twisting force.

I run at 1200-1400 or less, since my peak torque is at 1400 rpm and my peak HP is at 2200. I can do this with a manual transmission. One of a number of advantages of this setup.
Bob

 

[ozzie tractor]

isn't that saying the same thing twice?

doesn't explain why its most efficient at that point, just says that it is.

there are litraly thousands of things which affect the efficiency of a engine, to sit down and work out why it is efficient at that point would be a huge waste of time. the peak torque is not the reason for the efficiency it is the proof of it.