Branson 4815C PTO Dynamometer Test Results

[ruffdog]

Here is a video of a Prony brake dyno. As the band around the flywheel is tightened, more pressure is put on the scale. The final gear ratio through the mechanism and distance from the flywheel to the scale is used to calculate torque. Then, knowing the pto rpm, they calculate HP.

 

[Cougsfan]

I agree that You should not place any value on absolute numbers, but comparative numbers are great. I'd be interested in seeing what it does if you remove the soot blower. I gutted mine, and by the seat of the pants, it appeared to gain noticeable power, not to mention better fuel economy and removed the fear of running at too low of an RPM. I know from a lifetime of experience that the seat of the my pants is sometimes prejudiced by wishful thinking.

 

[LouNY]

It would be interesting to find out were the fuel screw on that pump is,
I'd be tempted once any scrubber is out of the exhaust, to tweak for just a touch of smoke
when loaded heavy at pto speed.

 

[K5lwq]

Cool video Ruffdog!

Lou, I had to laugh a little when I read your post. That was the first thing my Dad said when he was looking at the tractor. He was looking at the pump and said "let's turn her up a little, I bet we can get 55 horses out of her!" :laughing:

I am going to call Buster with Branson, when this is all done, and ask about getting that done with Bransons blessing. I have read about a Branson dealer somewhere that adjust every Branson they sell to meet specs. Don't know if that is true or not.

 

[K5lwq]

Haven't had much time to work on the exhaust but decided to take off the DPF to start the process.

That was a no go. It will not clear the studs on the back flange to come out. I have decided I am going to remove the studs and go back with four bolts instead. That will make removal and replace much easier later in life.

Hope to get it off Sunday so next week I can drop it off at the muffler shop to fabricate the replacement muffler.

 

[Asteral]

hey K5lwq, the dpf to be removed you will first have to disconnect the front section and removes it as it is installed in 3 parts, then you can proceed in removing the middle section then the final rear section, in the middle though you will have to unscrew the DPF hot gas temperature sensor, and differential pressure sensor and tie them up out of the way of the other engine components, once you do that the rest of it should come out without much issue. and from there you can move forward with your muffler mod.

 

[K5lwq]

Thanks Asteral, I really wanted to remove it as one unit. Just makes it easier and no chance of damaging the DPF.

I removed the four studs by getting two regular M8-1.25 nuts and jam nutting them together. This way I could remove the studs without damage to threads so they could be reinstated if someone desired. I will be going back with four flange bolts.

Once I got the studs out, the DPF lifted right out as one unit. Tomorrow, I will pick up a Stanley IH-4 muffler as Slowpoke Slim used. Monday morning I will drop it off at my local muffler shop to fabricate.

I will be out of town till Friday next week so hopefully they will have it ready by then. That would allow me to put it together next weekend.

 

[LouNY]

Making progress from the sounds of it.

 

[Slowpoke Slim]

Sounds great. I just hope the muffler length will work for you as it did for me. I have no idea if our 2 DPF filters are the same dimensions. Also, are they going to fab a mounting bracket for you, to bolt to the OEM mount? My exhaust guy thought it should have one, instead of just using the pipes for "mounts". Here is a pic of my mount with the welded on bracket:



Sounds like your exhaust shop is going to fab everything up on a bench and hand you a finished assembly. If that's the way you're going about it, it can work, it's just harder to do. I just hope they can get everything lined up, straight, and the flanges angled and "timed" properly for you. Do these guys do a lot of custom fab work? It would be much easier to make sure everything fits and seals up correctly if they had the whole tractor down there.

Good luck and post some pics when you get it finished.

 

[K5lwq]

Slim, your picture really helps as well as your thread. I debated taking the tractor and still may need to do that. The shop I am using said they could do it either way. They may change their mind once they see what needs to be done.

Their shop is on the main highway with no gate, so I was also concerned about leaving it there very long. I have to travel a good bit so it might would be in their way waiting on me to pick it up.

My DPF is 20" long and has a diameter around 7". Everything looks very similar to your pictures except mine has a four bolt flange on the manifold side. I am a little concerned that flange may be difficult to find.

With removing the studs, I can R&R in about 20 minutes without removing the hood. My plan is to write the instructions down and store that with the DPF. That way if the kiddos need to put it back on after I am gone they will know how.