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mrmallard13
MMT Pro Member
Joined: Mon Aug 08, 2011 7:43 pm Posts: 276 Location: Taylorsville,MS
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RPM question
I have a mud buddy 37 efi HDR with delta level 3 on it. The motor turns about 4200 rpms with just me or with 4 people. Does this sound about right? I thought it should've been a little higher. This is on a 17x51 boat.
_________________ 17x51 Prodigy with 37 efi hdr delta level 3
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Wed Oct 04, 2017 5:30 pm |
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brycecheramie
MMT 1000 Club
Joined: Thu Nov 04, 2010 7:38 am Posts: 4323 Location: Cut Off, La.
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Re: RPM question
_________________ Refurbishing a Prodrive
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Wed Oct 04, 2017 5:58 pm |
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mrmallard13
MMT Pro Member
Joined: Mon Aug 08, 2011 7:43 pm Posts: 276 Location: Taylorsville,MS
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Re: RPM question
Yeah I mean I can get more rpms out of it but the prop blows out. 4200 is the sweet spot
_________________ 17x51 Prodigy with 37 efi hdr delta level 3
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Wed Oct 04, 2017 6:35 pm |
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brycecheramie
MMT 1000 Club
Joined: Thu Nov 04, 2010 7:38 am Posts: 4323 Location: Cut Off, La.
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Re: RPM question
_________________ Refurbishing a Prodrive
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Wed Oct 04, 2017 6:52 pm |
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mrmallard13
MMT Pro Member
Joined: Mon Aug 08, 2011 7:43 pm Posts: 276 Location: Taylorsville,MS
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Re: RPM question
I'm running a worked merc 3
_________________ 17x51 Prodigy with 37 efi hdr delta level 3
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Wed Oct 04, 2017 8:18 pm |
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brycecheramie
MMT 1000 Club
Joined: Thu Nov 04, 2010 7:38 am Posts: 4323 Location: Cut Off, La.
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Re: RPM question
_________________ Refurbishing a Prodrive
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Wed Oct 04, 2017 8:41 pm |
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mrmallard13
MMT Pro Member
Joined: Mon Aug 08, 2011 7:43 pm Posts: 276 Location: Taylorsville,MS
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Re: RPM question
It's an efi motor but it seems like the throttle is getting full travel. I don't know the max rpms. I've just ran it where the prop was in the right spot.
_________________ 17x51 Prodigy with 37 efi hdr delta level 3
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Wed Oct 04, 2017 8:44 pm |
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brycecheramie
MMT 1000 Club
Joined: Thu Nov 04, 2010 7:38 am Posts: 4323 Location: Cut Off, La.
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Re: RPM question
Well I have no experience with EFI's motors, but it does seem like something is off, or not full travel on throttle cable. Im sure you should be in the 4600-4700 rpm range empty boat
_________________ Refurbishing a Prodrive
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Wed Oct 04, 2017 9:08 pm |
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mrmallard13
MMT Pro Member
Joined: Mon Aug 08, 2011 7:43 pm Posts: 276 Location: Taylorsville,MS
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Re: RPM question
Yeah I thought it should at least be around 4500. Any ideas on how to fix it?
_________________ 17x51 Prodigy with 37 efi hdr delta level 3
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Wed Oct 04, 2017 9:56 pm |
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brycecheramie
MMT 1000 Club
Joined: Thu Nov 04, 2010 7:38 am Posts: 4323 Location: Cut Off, La.
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Re: RPM question
Check back in the morning pal. I think you will get your answer from some knowledgeable folks when they wake up.
_________________ Refurbishing a Prodrive
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Wed Oct 04, 2017 10:04 pm |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm Posts: 4820 Location: West Monroe, LA
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Re: RPM question
How fast does that 4200 take you, and how high is your rooster tail?
#CFFITR #TheGhostBoat #whoneedsphysicsihaveamudmotor
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Thu Oct 05, 2017 5:13 am |
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mrmallard13
MMT Pro Member
Joined: Mon Aug 08, 2011 7:43 pm Posts: 276 Location: Taylorsville,MS
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Re: RPM question
I was running 33.5 empty with just me. 29-30 with 4 people. Rpms were the same the whole time. Rooster tail about 3 ft I guess. Prop halfway out of the water
_________________ 17x51 Prodigy with 37 efi hdr delta level 3
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Thu Oct 05, 2017 7:17 am |
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Will C
MMT Sponsor
Joined: Fri Jan 10, 2014 1:16 pm Posts: 2107 Location: Gladewater TX
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Re: RPM question
I would say your mph is good exspecially for low rpm. Could be alot of prop or boat has some character or a combo of the two
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Thu Oct 05, 2017 8:14 am |
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mrmallard13
MMT Pro Member
Joined: Mon Aug 08, 2011 7:43 pm Posts: 276 Location: Taylorsville,MS
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Re: RPM question
I believe it is a 12 pitch prop. Boat is all .125 with cat walks, extended deck, trays on each side, and driver and passenger dry box
_________________ 17x51 Prodigy with 37 efi hdr delta level 3
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Thu Oct 05, 2017 8:22 am |
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50fps
MMT 1000 Club
Joined: Tue Jan 13, 2009 6:42 pm Posts: 2377 Location: West Coast Wisconsin
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Re: RPM question
1751 Excel?
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Thu Oct 05, 2017 8:48 am |
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Will C
MMT Sponsor
Joined: Fri Jan 10, 2014 1:16 pm Posts: 2107 Location: Gladewater TX
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Re: RPM question
I happen to have a 1751 excell in the shop now. Its only got 37 inches of flat before the tapers start. Im no hull expert but ive noticed that when there isnt much true flat bottom surface the rear of the boat runs deeper and can act weird
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Thu Oct 05, 2017 10:17 am |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm Posts: 4820 Location: West Monroe, LA
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Re: RPM question
that speed is what you should be running. if you want more rpms, dump some pitch out of that prop. welcome to the prop game.
#CFFITR #TheGhostBoat #whoneedsphysicsihaveamudmotor
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Thu Oct 05, 2017 12:07 pm |
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mrmallard13
MMT Pro Member
Joined: Mon Aug 08, 2011 7:43 pm Posts: 276 Location: Taylorsville,MS
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Re: RPM question
It's a 1751 prodigy. Do those speeds sound about right?
_________________ 17x51 Prodigy with 37 efi hdr delta level 3
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Thu Oct 05, 2017 1:38 pm |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm Posts: 4820 Location: West Monroe, LA
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Re: RPM question
yep.
#CFFITR #TheGhostBoat #whoneedsphysicsihaveamudmotor
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Thu Oct 05, 2017 1:44 pm |
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OhioDuckMan
New Member
Joined: Sun Feb 05, 2017 6:05 pm Posts: 2
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Re: RPM question
I've got the Prodigy 1854 with all the same features plus 2 batteries and 24 inch sidewalls. I've had it at 33 mph with me (230 lbs) and 2 labs (75 lbs each) in deep water. I'm running around 4700 rpm to hit my top speeds. Rooster tail about 15 - 20 ft. I just got it and its my first mud rig... so i'm certainly no expert at this.
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Thu Oct 19, 2017 10:06 pm |
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