PTO Dyno

[bobodu]

So you can figure the target torgue etc.....can you guesstimate when something in the driveline is gonna let go??? I know pulling an engine is a pain but it pales compared to a broken tranny.

 

[john_bud]

I'm proud to say that my 01 dodge lay's down and impressive 535hp and 1132lbf of torque where the rubber meets the road and I get an impressive


23 mph


on the highway.


JG

So, you're the joker that's going 23 mile per hour on the highway, eh? Typical dodge guy.....



(just yanking your chain !)

 

[Treemonkey1000]

So, you're the joker that's going 23 mile per hour on the highway, eh? Typical dodge guy.....

(just yanking your chain !)

NOw that one made me laugh! Is he all white hair and can't see over the steering wheel as well? They sell strobe light tachometer testers that are pretty accurate to test PTO RPM. I test those types of things here where I work. As far as loading the PTO shaft why not drive a hydraulic ram to it's limit or have a valve that restricts the flow but increases the pressure required to drive it? Is that making sense?
I am in the camp that my little Kubota is not new so I don't want to hop it up an break it. Getting a little more performance is nice to have.. Maybe funny car headers and wrinkle wall ag tires?

 

[jgendr]

So, you're the joker that's going 23 mile per hour on the highway, eh? Typical dodge guy.....



(just yanking your chain !)

ROFLMAO!!!! Ah No, 65 - 70 is good for me and yes I do get 23 MPG's. Good one though. But I do have a freind that resembles that remark HA HA HA!!! save that for another story.

Treemonkey; I'm very interested in what you said. do any of the tach you are talking about rs-232 or usb capable? if so post somemore info. Manufacture, part #'s and such. My Yanny has the same motor as the fx24, fx32 and fx42. So if the right combination of mods can be done I can theoretically juice it up to 42 pto hp and not exceed the limits of the tractor. a 14 hp gain at the pto isn't somthing to not considerif it is cost effective. What is cost effective you ask? How's $250 or less. Interested now?

 

[lfarrar]

Hey jgendr,
Just put it on "DRUGS" aka propane. That will wake'r up!
In moderation of course.

Lou

 

[Treemonkey1000]

Ok I will look at work tomorrow for some of the Tachs. I don't remember them being USB ported. They read out on a LCD display. But I Imagine there are some with USB capability.

 

[dfkrug]

Great idea, JGENDR. I hope you follow it thru. A recent TBN poster has
completed a small simple turbo installation and could use a dyno.
http://www.tractorbynet.com/forums/...oject-tractor-contined-turbo.html#post1329205

As far as loading the PTO shaft why not drive a hydraulic ram to it's limit or have a valve that restricts the flow but increases the pressure required to drive it? Is that making sense?

Regarding the use of hydraulics to make a controllable measurable load, I
would use a PTO pump as TREE suggests, but use it with an adjustable
constriction (valve) and pressure monitoring. You would have known
volume, based on RPM and pump displacement, and you increase the
restriction until the engine starts to slow down. Your oil will heat up,
but not as fast as dry brakes.

Keep us posted. Good science is about controlled experiments and
measurable results.

 

[xlr82v2]

Here's something I found on Google...

Tractor Dynomometer

 

[SPYDERLK]

Great idea, JGENDR. I hope you follow it thru. A recent TBN poster has
completed a small simple turbo installation and could use a dyno.
http://www.tractorbynet.com/forums/...oject-tractor-contined-turbo.html#post1329205



Regarding the use of hydraulics to make a controllable measurable load, I
would use a PTO pump as TREE suggests, but use it with an adjustable
constriction (valve) and pressure monitoring. You would have known
volume, based on RPM and pump displacement, and you increase the
restriction until the engine starts to slow down. Your oil will heat up,
but not as fast as dry brakes.

Keep us posted. Good science is about controlled experiments and
measurable results.

Hydraulics is a good way to go but, pressure and volume only gets you within about 20% of the true HP due the unknown loss values. You could assign a 15-20% number to it and come close, but since the plan is to measure PTO output torque and rpm you really only need the hyd to provide a custom tailorable load. The other measured parameters provide the accurate HP measurement.
larry

 

[dfkrug]

Hydraulics is a good way to go but, pressure and volume only gets you within about 20% of the true HP due the unknown loss values. You could assign a 15-20% number to it and come close, but since the plan is to measure PTO output torque and rpm you really only need the hyd to provide a custom tailorable load. The other measured parameters provide the accurate HP measurement.
larry

It is true that hyd systems are only about 85% efficient in transferring
power. However, calibration of the resulting system would determine
its efficiency within the range of expected hydraulic flow rates. A poor
man's calibration would be to test tractors that have published standard
PTO outputs. Also, don't forget that comparing PTO outputs before
and after modifications would still result in a good measure of the output
CHANGE.