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Proper Gov adjustment on a Modded PD
http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=12310		 Page 1 of 1
Author:  SP [ Sun Sep 12, 2010 6:34 pm ]
Post subject:  Proper Gov adjustment on a Modded PD
I have a Pro Drive that I have been working on over the last couple of years. Last year I added a muffler, modded my stock carb, added a cam, modified stock intake, had some head work done and added stainless valves(stock size). I just had my heads worked on again. I had new larger SS Valves installed, they bored out the existing seats with new larger seats installed, and added roller rockers.

I do not have the boat back so I have not run ti yet, but my WOT out of water RPM's are now at 4490. I originally had it set at 4250-4300. What would be the appropriate setting on motor with these mods? As you may be able to tell from this post, I am learning about these engines, so your input is appreciated!
Author:  SP [ Mon Sep 13, 2010 1:39 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
I know 4250 is the standard answer. Thoughts?
Author:  deadbird8 [ Mon Sep 13, 2010 5:01 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
If your valve springs are shimmed then 4500-4600- the stock connecting rods are your next point of failure.
Author:  SP [ Mon Sep 13, 2010 5:28 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
Thank you Gary. I will probably just leave it where it is then, and see how it goes. Not sure where she is going to turn under load yet. I may adjust it down a little after I run it, but we will see. The springs are not shimmed, but I have dual springs installed. I forgot to mention that. I am finished with the mods now. I may add the Mikuni, but that is going to depend on how she runs. Not sure if I want that hassle though...
Author:  Duck Diggler [ Mon Sep 13, 2010 8:14 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
Newton,
Did you have Sid work on your engine? Did the last guy do what you paid him to do?
Author:  SP [ Mon Sep 13, 2010 8:49 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
David- Not yet. Sid has had a hard time getting the Mikuni, but he has them in stock now. From what I hear, the head work turned out really nice. Tim, Steve's buddy reassembled the motor, and he was really impressed with the work. I am picking it up this Sunday. Steve said the motor is running really smooth, and just sounds really tight. I found out during this process my intake was shot. I had two broken bolts and three cracks/holes in it!! I have no idea how this happened, but this could have explained some of my problems... :lol: Tim also re-wired my fuel pump to turn on with oil pressure gauge rather than the key. This will keep the FP from turning on every time I turn on the key. It will kick in only when there is oil pressure (when I am running or try to start the motor).

I haven't been out scouting yet. I have been slammed. Looks like I am going down to Broadmore for the opening, and then probably over to "Kissimmee" to wrap it up. What about you? Gainesville? I will let you know if I get on them.
Author:  deadbird8 [ Tue Sep 14, 2010 8:16 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
Author:  SP [ Wed Sep 15, 2010 3:30 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
Author:  craig [ Wed Sep 15, 2010 4:36 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
I would set it at 4250.......I WOULD NOT be turning an engine with stock connecting rods 4500-4600 rpm!!!
Author:  SP [ Wed Sep 15, 2010 6:40 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
Author:  deadbird8 [ Wed Sep 15, 2010 7:35 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
he keeps the push rods stock.

I ran my last motor at 4500 RPM for over a 130 hours with stock connecting rods but not much over that.
Author:  SP [ Wed Sep 15, 2010 7:52 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
You are right- I wasn't thinking. Hmm- maybe I am not finished with the mods.... Are most guys who have gone this far replacing the connecting rod's? And I guess my original question still holds though, as this seems to be my weak link today, at what RPM range do they begin to fail? Thx.
Author:  craig [ Wed Sep 15, 2010 8:15 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
Author:  SP [ Wed Sep 15, 2010 8:20 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
And last question- Assuming I change the connecting rods, then I would assume the push rods become my weakest link. When do the push rods begin to fail? This is actually very helpful, so thank you for the info!
Author:  iowaducker06 [ Wed Sep 15, 2010 8:22 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
why not just run a bigger prop? Your speed will go up and your RPMS will go back down to where they were. Maybe mud motors are different, but I'm a big bass fisherman and we keep the RPMS where we want them by changing the size of our prop.
Author:  craig [ Wed Sep 15, 2010 8:28 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
In the 5000 rpm range.
Author:  SP [ Wed Sep 15, 2010 8:29 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
Author:  SP [ Wed Sep 15, 2010 8:31 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
Thx guys. i appreciate the info!! Connecting rods may be in my future...
Author:  craig [ Wed Sep 15, 2010 8:33 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
My advice to you......leave it alone! Leave it just the way you have it and be happy!
Author:  SP [ Wed Sep 15, 2010 8:39 pm ]
Post subject:  Re: Proper Gov adjustment on a Modded PD
probably good advice!
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