Branson 4815C PTO Dynamometer Test Results

[K5lwq]

This thread will be the results from a series of PTO Dyno test before and after modifications to the Branson 4815C. All thoughts and comments are welcome. Also, please feel free to post any Dyno results you may have for your tractor. I have been guilty of speculating or taking manufactures word for hp ratings and decided it is time to get some facts. I am very surprised at the initial test results!

Branson 4815C, Kukje A2300N2 diesel engine. 48hp claimed engine output and 40hp claimed at the PTO at 2600 RPM.

First test results with only 9hrs on the tractor and stock is 35hp at 540 PTO RPM. It hit 36hp when loaded down to around 500 PTO RPM but fell off quick after that. Net result is 35hp tested PTO hp.

Unfortunately, the location that did the test was not able to provide the graft as they don't have the printer for the Dyno.

I would have bet money that it would have been around 42 PTO hp and would have lost money. I do think it will get better as the engine limbers up some but sure thought it would be higher.

Next test will be after replacing DPF with standard muffler. Not sure if there will be a difference but seems like I should see a 10% increase. But, what do I know? :laughing:

 

[ruffdog]

Not all dynos read the same or give the same results. If you repeat the same testing procedure on the same dyno, you should at least have a good comparison.

 

[K5lwq]

Not all dynos read the same or give the same results. If you repeat the same testing procedure on the same dyno, you should at least have a good comparison.

I agree and that is the plan. After the modification and we test on the same dyno, I might go to another location that can give the print out.

 

[Slowpoke Slim]

Very interesting thread. Thanks for doing this. I wish there was a shop around here that could do one. To my knowledge there isn't, but I must confess I haven't really searched for one either.

Is this shop at a tractor or ag equip dealer somewhere in your area?

 

[K5lwq]

Yes Slim, it is at my local JD dealer. The Kubota dealer in Longview said they would test as well and they can give the print out. The reason I didn't go there is because it is an hour away and JD is 10 minutes. I might be lazy!

 

[ptsg]

Cool! Thanks for doing this and posting the results here!

Interesting results indeed. I'm sure it will get better as the hours start to accumulate.

Correct me if I'm wrong, but dynamo-meters are also calibrated for a certain HP range where they are more accurate, right?

There was a post on Branson Facebook group from a Branson technician where they tested a 4520R (same A2300N2 engine) with over 600 hours and it made 43 HP at the PTO.

Anyways, looking forward for the runs after the exhaust mod. :thumbsup:

 

[desertdog71]

TQ. Numbers would be interesting to see also.

 

[BertZegers]

This thread will be the results from a series of PTO Dyno test before and after modifications to the Branson 4815C. All thoughts and comments are welcome. Also, please feel free to post any Dyno results you may have for your tractor. I have been guilty of speculating or taking manufactures word for hp ratings and decided it is time to get some facts. I am very surprised at the initial test results!

Branson 4815C, Kukje A2300N2 diesel engine. 48hp claimed engine output and 40hp claimed at the PTO at 2600 RPM.

First test results with only 9hrs on the tractor and stock is 35hp at 540 PTO RPM. It hit 36hp when loaded down to around 500 PTO RPM but fell off quick after that. Net result is 35hp tested PTO hp.

Unfortunately, the location that did the test was not able to provide the graft as they don't have the printer for the Dyno.

I would have bet money that it would have been around 42 PTO hp and would have lost money. I do think it will get better as the engine limbers up some but sure thought it would be higher.

Next test will be after replacing DPF with standard muffler. Not sure if there will be a difference but seems like I should see a 10% increase. But, what do I know? :laughing:

It would be beneficial to know when the dyno was last calibrated, and what the results were. I worked at a repair shop once, and the dyno was used mainly to test tractor engines under load. The HP readings were not accurate for sure!

 

[ericm979]

Is your 4815 engine a turbo triple or non turbo four? Bransons' web site says it's a triple but the bore, stroke and displacement listed match that of the 4520 which is a four. When I was shopping Bransons they'd just come out with a high HP model of the 15 series (can't remember if it was the 4815 or another one) which had a turbo triple. Of course that was three years ago and they might have changed.

 

[K5lwq]

Cool! Thanks for doing this and posting the results here!

Interesting results indeed. I'm sure it will get better as the hours start to accumulate.

Correct me if I'm wrong, but dynamo-meters are also calibrated for a certain HP range where they are more accurate, right?

There was a post on Branson Facebook group from a Branson technician where they tested a 4520R (same A2300N2 engine) with over 600 hours and it made 43 HP at the PTO.

Anyways, looking forward for the runs after the exhaust mod. :thumbsup:

I am not sure about the calibration. Also would be interesting to know what the variances from one dyno to the next. I would think they would be close but not exact.

Torque was difficult to read as it changed more rapidly than the hp did. This is because hp is a calculation of the torque measurement. Hp= (torque x rpm)/5252

The dyno showed hp in whole numbers which is why it was easier to watch. But the torque was in the 345 ft lb range so that would make it around 35.47 hp.

 

[K5lwq]

It would be beneficial to know when the dyno was last calibrated, and what the results were. I worked at a repair shop once, and the dyno was used mainly to test tractor engines under load. The HP readings were not accurate for sure!

I have no idea about when or if it was calibrated. They said they mainly used it to load the tractors as you mentioned so I doubt they calibrate it at all. What I don't know is if it is off, how much could it be? I would think it would be +-2hp or so.?

 

[K5lwq]

Is your 4815 engine a turbo triple or non turbo four? Bransons' web site says it's a triple but the bore, stroke and displacement listed match that of the 4520 which is a four. When I was shopping Bransons they'd just come out with a high HP model of the 15 series (can't remember if it was the 4815 or another one) which had a turbo triple. Of course that was three years ago and they might have changed.

It is a four cylinder non turbo. If you can trust the specs the bore and stroke is the same as 3 cylinder model but displacement higher.

 

[LouNY]

Most of the old pto water bank dynos were +-10%,
they were good for tuning as you were just looking for the change not an exact value.

 

[K5lwq]

Lou, you are correct. I am more interested in the change over a exact value. However, I was hoping to get a decent number for rating as Branson list the same PTO hp for HST and geared tractors. I find that hard to believe.

So if it is +-10%, that would put it around 39hp if it is reading on the low side. Wonder what the HST model would be?

Another thought could be the rating was done on a non DPF model and once the conversion is complete, it will be more in line with the claims.

 

[LouNY]

I would expect the pto hp to be the same as it is a straight thru drive from the engine to the pto clutches.
The transmission HP changes would be on something like the Nebraska test or on a wheel dyno such as a car or truck would show.

 

[K5lwq]

Maybe so Lou. I may have understood incorrectly. :confused3:

 

[sd455dan]

I am not sure about the calibration. Also would be interesting to know what the variances from one dyno to the next. I would think they would be close but not exact.

Torque was difficult to read as it changed more rapidly than the hp did. This is because hp is a calculation of the torque measurement. Hp= (torque x rpm)/5252

The dyno showed hp in whole numbers which is why it was easier to watch. But the torque was in the 345 ft lb range so that would make it around 35.47 hp.

Sorry, The torque # of 345 lb ft. just can't be right- that is more than double most tractors rated at around 50 HP


using a 50 hp tractor as an example -even one that will produce more torque because it is rated at max power at a lower RPM say 2000 RPM the math shows


2000 rpm X 150 lb ft = 300000 divided by 5252 = 57 HP


or using Branson's HP Max rating @ 2600 RPM

35.47 X 5252 = 186,288

186288 divided by rated HP RPM of 2600 = ~ 71.65 lb ft

Obviously that is not the Bransons engines peak torque #- it should take place at a lower RPM and definitely will be higher but not over 250 lb ft higher.


Not trying to start an anything , but 345 lb ft just can't be right.

 

[LouNY]

Sorry, The torque # of 345 lb ft. just can't be right- that is more than double most tractors rated at around 50 HP


using a 50 hp tractor as an example -even one that will produce more torque because it is rated at max power at a lower RPM say 2000 RPM the math shows


2000 rpm X 150 lb ft = 300000 divided by 5252 = 57 HP


or using Branson's HP Max rating @ 2600 RPM

35.47 X 5252 = 186,288

186288 divided by rated HP RPM of 2600 = ~ 71.65 lb ft

Obviously that is not the Bransons engines peak torque #- it should take place at a lower RPM and definitely will be higher but not over 250 lb ft higher.


Not trying to start an anything , but 345 lb ft just can't be right.

Most pto dynos are indicating pto torque to get to your engine torque divide that number by the engine rpm to the pto rpm,
that is going to be around 4.6 to 4.8.
So 345 (pto torque)divided by 4.8 (pto rpm/engine rpm)=71.8 engine torque.

 

[sd455dan]

Most pto dynos are indicating pto torque to get to your engine torque divide that number by the engine rpm to the pto rpm,
that is going to be around 4.6 to 4.8.
So 345 (pto torque)divided by 4.8 (pto rpm/engine rpm)=71.8 engine torque.

AHH, that clears it up.

Now that I think about it, any tractors that run 1000 RPM PTO's would need to be converted to.


My mistake, Sorry about that K5lwq and Great info- thanks Lou

Oh and Congrat's on the New Branson K5lwq it is a Beauty

and when the time comes to purchase another tractor for our property Branson is at the top of my list.

 

[K5lwq]

Thanks Dan and no worries. Thanks Lou.

Once all of this is complete, I will take it somewhere that can print the test results. Maybe it will also be more accurate but who knows.