It is currently Sun Aug 19, 2018 11:33 pm




Reply to topic  [ 55 posts ]  Go to page Previous  1, 2
 Question? 
Author Message
MMT 1000 Club

Joined: Sun Sep 01, 2013 2:53 pm
Posts: 3458
Location: Hardin County, Tx
Post Re: Question?
4900 won't hurt a thing with a properly built/balanced bottom end.

_________________
#CFFITR

-Custom pool noodle
-stage 4 water wings


Sun Jul 01, 2018 4:24 am
Profile
MMT F.E.

Joined: Fri May 29, 2009 2:53 pm
Posts: 988
Location: TEXAS
Post Re: Question?
Wchauvin wrote:
I personally would not run at 4900 all the time. That is going to be very stressful over time on your engine. 4400-4500 is optimal running range for these things without have issues down the line, IMO.
35.5 is good speed, you should be happy with that once you adjust your tabs especially


That is not correct on a properly built motor. Lugging the motor down to where you are talking about can actually hurt it more in the long run. My motor had the 4750 rev limiter before being built and was then changed to run up to 5000 RPMs. My builder recommends propping it to run 4850-4900 RPMs.


Mon Jul 02, 2018 11:23 am
Profile
MMT Member
User avatar

Joined: Sat Jun 09, 2018 9:36 am
Posts: 36
Location: Texas
Post Re: Question?
Westi wrote:
GNSPEED wrote:
Westi,where are you located in TX ive got a few different props you could try.I run one of Nick Ws big motors,1 with heads and cam,and his hunt motor with pistons and rods on 18ft uncle j hulls.I am located in Willis.


I live over in New Braunfels, but I'm actually out in Pecos right now working. Right now I have a merc 3 and big blade both worked by Baggy. The merc runs fastest at 4250-4300 RPMs and then speed falls off after that even though I can run it up to my rev. I really haven't had enough time to test either of them out, but with an empty hull I was able to run 35.5 before my hull started bouncing and losing speed so I know I need to adjust my trim tabs, as well. The holeshot is really slow, but I was eventually able to plane 4 guys and a loaded cooler to 29.8 mph with it. Still around 4250 RPMs. Nick recommended propping it to run closer to 4900 RPMs so back to the drawing board with that one. Any suggestions? More rake or cup? Less pitch?

I'm in Stanton for work. Been out this way as well on and off 4 years now. Should be getting my prodigy this weekend. Although I'll be traveling around during duck season I plan to scout around san Angelo lakes.


Sent from my iPhone using Tapatalk

_________________

1854 Prodigy Elite-Mud Buddy 40 hdr


Mon Jul 02, 2018 8:50 pm
Profile
MMT Member
User avatar

Joined: Sat Jun 09, 2018 9:36 am
Posts: 36
Location: Texas
Post Re: Question?
Westi if your ever around and not working and wanna set in somewhere with the boats let me know.


Sent from my iPhone using Tapatalk

_________________

1854 Prodigy Elite-Mud Buddy 40 hdr


Mon Jul 02, 2018 8:56 pm
Profile
MMT Pro Member

Joined: Sat Sep 30, 2017 7:10 pm
Posts: 338
Location: Raceland, Louisiana
Post Re: Question?
I've been told different from local builders, but I suppose experiences from different builds reflect the views of certain people. Maybe you are right and maybe not. I know from a car perspective, when we ran a 470ci big block camaro at WOT on the weekends at the track, we had to rebuild everything ever 50-75 passes, which was typical for these high HP engines. Whether this applies to mud motors or not, I don't know, but I know that I don't want to rebuild anything unless I'm doing this for performance reasons. Hopefully if you get yours built, you can run it as hot as you want with no issues. I plan on getting a stage 3 on mine when the warranty is out and hope to get that type of confidence and dependability out of mine when the time comes.

_________________
1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Mon Jul 02, 2018 9:18 pm
Profile
MMT Elite Member
User avatar

Joined: Wed Jan 14, 2009 7:23 am
Posts: 6023
Location: Tarkington, TX
Post Re: Question?
Wchauvin wrote:
I've been told different from local builders, but I suppose experiences from different builds reflect the views of certain people. Maybe you are right and maybe not. I know from a car perspective, when we ran a 470ci big block camaro at WOT on the weekends at the track, we had to rebuild everything ever 50-75 passes, which was typical for these high HP engines. Whether this applies to mud motors or not, I don't know, but I know that I don't want to rebuild anything unless I'm doing this for performance reasons. Hopefully if you get yours built, you can run it as hot as you want with no issues. I plan on getting a stage 3 on mine when the warranty is out and hope to get that type of confidence and dependability out of mine when the time comes.


Back in the day we used to think lesser RPM was better. We had High PSI motor, LUGGED the fuck out of them with big props... they popped like pocorn. Now we put deeper gears, more PSI, and let the engine spin up without all the additional load on itself and they are lasting longer.... its finding a balance. A stock rod motor can handle a 4750 rpm limit quite well as long as you don't stay on the limiter loading the cylinders with fuel.

_________________
Bayou Surface Drive
337-351-0362
Tarkington, TX 77327


Tue Jul 03, 2018 5:53 am
Profile
MMT Pro Member

Joined: Sat Sep 30, 2017 7:10 pm
Posts: 338
Location: Raceland, Louisiana
Post Re: Question?
Very interesting stuff. I can't wait to get mine staged up later on down the road. Need to save this extra money first lol

_________________
1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Tue Jul 03, 2018 7:32 am
Profile
MMT F.E.

Joined: Wed Feb 10, 2010 3:28 pm
Posts: 986
Location: Avoyelles Parish
Post Re: Question?
I'll stick to running in the 4200/4300 range. Running against the rev limiter most of the time with a briggs block is asking for trouble and I don't care who built it the engine or how they built it.

_________________
18X44 Geaux Custon Powered By MB 4500 BD


Tue Jul 03, 2018 8:05 am
Profile
Online
MMT 1000 Club

Joined: Mon Dec 31, 2012 11:07 pm
Posts: 3981
Location: West Monroe, LA
Post Re: Question?
Why even participate in these discussions? Most of us have experienced or witnessed Marcus and Will go out of their way to help people that have never spent a dime with them. We've also done business with people that actually stand by their work, and trust those gents to do that as well. Just because you don't doesn't mean there aren't decent people doing business. Dont get work done by them, dont climb out of your box to see that there is some new work being done on these engines that actually doesn't hurt reliability like it used to. But also dont come here with your crap that doesn't reflect the fact that some of these guys know more than you about how to build these things CORRECTLY to make them last. Experience matters, and yours is lacking, apparently. Not everyone that does business shits on their customers.

#CFFITR
#TheGhostBoat
#whoneedsphysicsihaveamudmotor


Tue Jul 03, 2018 9:00 am
Profile
MMT F.E.

Joined: Wed Feb 10, 2010 3:28 pm
Posts: 986
Location: Avoyelles Parish
Post Re: Question?
My comments are not geared towards Marcus or anyone in particular but more the reliability of modded motors or lack there of. I’m undaunted by your suggestions. I’ll do as I please and you do the same.

_________________
18X44 Geaux Custon Powered By MB 4500 BD


Tue Jul 03, 2018 9:43 am
Profile
MMT Elite Member
User avatar

Joined: Wed Jan 14, 2009 7:23 am
Posts: 6023
Location: Tarkington, TX
Post Re: Question?
Who is Marcus?

_________________
Bayou Surface Drive
337-351-0362
Tarkington, TX 77327


Tue Jul 03, 2018 10:52 am
Profile
MMT F.E.

Joined: Wed Feb 10, 2010 3:28 pm
Posts: 986
Location: Avoyelles Parish
Post Re: Question?
MaXXis85 wrote:
Who is Marcus?



Good question. I could have said Joe or Moe. Matters not when it comes to heavily modded mud motors.

_________________
18X44 Geaux Custon Powered By MB 4500 BD


Tue Jul 03, 2018 11:05 am
Profile
MMT Elite Member
User avatar

Joined: Wed Jan 14, 2009 7:23 am
Posts: 6023
Location: Tarkington, TX
Post Re: Question?
Suppose I build a motor with billet rods for reliability keep CR LOW, use a small cam, Do porting like major manufacturers do (clean up ports), and the Stock Carb. Will that be detrimental to the health of the engine?

_________________
Bayou Surface Drive
337-351-0362
Tarkington, TX 77327


Tue Jul 03, 2018 11:16 am
Profile
MMT F.E.

Joined: Wed Feb 10, 2010 3:28 pm
Posts: 986
Location: Avoyelles Parish
Post Re: Question?
MaXXis85 wrote:
Suppose I build a motor with billet rods for reliability keep CR LOW, use a small cam, Do porting like major manufacturers do (clean up ports), and the Stock Carb. Will that be detrimental to the health of the engine?



It's all a crap shoot. That's my point.

_________________
18X44 Geaux Custon Powered By MB 4500 BD


Tue Jul 03, 2018 12:21 pm
Profile
MMT Elite Member
User avatar

Joined: Wed Jan 14, 2009 7:23 am
Posts: 6023
Location: Tarkington, TX
Post Re: Question?
Ducaholic wrote:
MaXXis85 wrote:
Suppose I build a motor with billet rods for reliability keep CR LOW, use a small cam, Do porting like major manufacturers do (clean up ports), and the Stock Carb. Will that be detrimental to the health of the engine?



It's all a crap shoot. That's my point.

My point is people get hung up on a piece of paper... in which the big companies will most of the time tell the customer it was their fault anyway... Fuck that paper. Ill build engines and make people happy.

_________________
Bayou Surface Drive
337-351-0362
Tarkington, TX 77327


Thu Jul 05, 2018 4:52 am
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 55 posts ]  Go to page Previous  1, 2

Who is online

Users browsing this forum: aggiekicker27 and 44 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to: