What is your top RPM limit?

hbaird · Jul 23, 2005

Just a plain Y380 no T. I have wondered about the lack of the T. Others have mentioned a T. I think I do have a different governor. Before I setup the injectors I had very low power, but the engine showed no other kind of problem. It was slow to start but ran clean and very smooth. I advanced the injectors at least 6-8 degrees, getting more power as I went. That started me researching and looking for the source of the lack of the power. I think the engine was detuned from the beginning. I still wonder about the 900 RPM idle, it seems way too fast for me. I take full time care of my granddaughter in the summer so I can't stay out very long at a time for work here. A high revving 284 inspired me to at least increase the rev limit to 2500 in hopes of getting better throttle response. I don't need any more HP now, I would like to get my mower revved up quicker. I am cutting in old second growth forest, many large and small trees with continuous turning and backing up. The slow revving is always a problem.
Harold

JINMA224XR · Jul 23, 2005

A high revving 284 inspired me to at least increase the rev limit to 2500 in hopes of getting better throttle response. 

Hey Harold,

When the 284 was turning 2800, was the tack still in the green zone?

If you turn yours up to 2500, do you think that you may need a different governor. I haven't closely examined my governor, but I will see if it has some identifiable markings.

Just went out to close the garage doors, as a Thunder Shower is coming in off the Gulf. I looked at my tack, and the green zone on mine is between 2150 and 2350rpm. My 224 has the integrated gauge's, all in one unit.

I also looked at the governor, and I didn't see any identifiable markings, but they are probably there, just painted over, where they are not easily seen. On my tack, 3000rpm is the maximum that my tack will actually measure rpm's.

You know more about engines, than I do, but on diesel engines, high rpm's can do them in pretty quickly. But as long as you are in the green zone, I don't see any harm, but that is still just a hunch though.

On Generator, where an engine is running at a constant speed with a constant load, then I might could see that an engine at higher rpms might hold up. But with our load variable constantly changing with reving up and then slowing down, I tend to think, on a tractor doing multiple tasks would be harder on an engine. But still just a guess on my part and nothing factual to base my thinking on.

Be careful out in this heat, This year seems to be hotter than last year, but it's probably that I'm just getting older. /forums/images/graemlins/smile.gif

Get your tractors running &
Have a nice day,
Joe /forums/images/graemlins/cool.gif

bruce1966us · Jul 23, 2005

( The slow revving is always a problem.
Harold )

That engine has a rather large and heavy flywheel that keeps it from getting the RPMs up quicker.

Bugsy · Jul 24, 2005

The "T" suffix just stands for the engine's designated use. For example:

T=Tractor
D=Stationary
Z=Turbo
Y=Vehicle
C=Marine

Therefore, in a tractor, they are all "T", stamped or not. The engine labels are "loosely" prepared. Sometimes the factory stamps the labels, sometimes the salespeople.

What changes with each designation is the fuel flow, via governor, and the timing. You will see that the highest power ratings are shown on the "Y" engines.

Any one of the engines can give the higher output, BUT it is not a good idea to alter. On the tractors, or any engine driven machine, the engine is only part of a system. Turning up an engine will not only shorten an engine's life, but also lead to other breakage of components.

Another everyday example is Ford and International Trucks (Navistar). The T444e is the same engine as the 7.3L Powerstroke. That is common knowledge. Navistar governs their engines at 2400-2650 rpm and 190Hp. Ford goes to 3300 rpm, and something like 300Hp. The Ford is "quick" around town, but its actual service life is usually about 300k miles, while the Navistar can and does run 1 million.

Commercially, we need longevity and reliability, while for pleasure we want "power" and comfort. A person can make their tractor a "hopped up" machine, and some do, but they lose the longevity and reliability. For those that want thousand of trouble free hours - a "race tractor" is not an option.

RonMar · Jul 24, 2005

I would think the governor should limit your RPM to the top of the green arc. Is your throttle linkage able to move the actuation lever on the fuel pump to its full position? Before I did any adjustments to any of the governor settings, I would first confirm that the tach is reading accuratly. My 284 idles at around 900 and tops out right at 2350.

greg_g · Jul 24, 2005

( I would think the governor should limit your RPM to the top of the green arc. )

The "green mark" on all the Asian tractor's I've seen, represents the engine RPMs required to achieve the correct PTO operating speed. By design, it's always going to be somewhat short of the actual top engine RPM capability. My KM454 for example, is rated 33.7 KW @ 2500 RPM, but I can rev to a full 2650 under full throttle. The "green zone" however, is down between 2200 and 2300.

So comparing RPM activity on different tractor models is meaningless, as the tach that's installed on the assembly line will likely be the one that's matched to the engine variant (governor, injectors, timing).

//greg//

hbaird · Jul 24, 2005

The 284 had the same green zone as my 200. And it revved much faster than mine. About 1 second to the green zone against 3 seconds for me. It may be a governor difference or it could be higher rev limit/ faster response. I had a large old Pin Oak cut down and cut up yesterday and I moved log sections for a while this morning. Plenty of power to lift 3 to 400 lb chunks of wood. It did tend to lift the front wheels if I went too high with the boom pole. Having the rev limit at 2250 is convenient. I just run full out when I am cutting.
Harold