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| not settin any speed records! help!!! http://mudmotortalk.com/mmt_v2/viewtopic.php?f=2&t=33789 |
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| Author: | fowllife08 [ Mon Oct 29, 2012 8:23 am ] |
| Post subject: | not settin any speed records! help!!! |
Just finished my surface drive and I went test it yesterday and I'm only getting 8 mph. My ratio is 1.375:1. I'm running a 9x6 prop. The boat is 1436 and the motoe is 13hp. I do have a 10x8 prop. Do you think this is right or do I need to put the bigger prop on it? Will it make a difference? |
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| Author: | CCC [ Mon Oct 29, 2012 10:49 am ] |
| Post subject: | Re: not settin any speed records! help!!! |
What is your rpm? |
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| Author: | eljefe [ Mon Oct 29, 2012 10:52 am ] |
| Post subject: | Re: not settin any speed records! help!!! |
are you using a surface drive prop or a longtail prop? you prolly wont get more than 12mph at most with everything perfect.... |
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| Author: | fowllife08 [ Mon Oct 29, 2012 11:05 am ] |
| Post subject: | Re: not settin any speed records! help!!! |
not sure on the rpm, waiting on tach in mail. the 9x6 is a longtail prop. i had it on a longtail and i was pullin 15-17mph. maybe my gearing is screwed up? |
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| Author: | nasty [ Mon Oct 29, 2012 12:42 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
Prop has a lot to do with it. |
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| Author: | CCC [ Mon Oct 29, 2012 12:49 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
Get a surface drive prop |
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| Author: | fowllife08 [ Mon Oct 29, 2012 1:05 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
:/ and I think the 10x8 I have is a longtail... its the one from hill marine any way to tell if its a true sd prop? Thanks for the input guys! |
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| Author: | CCC [ Mon Oct 29, 2012 1:15 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
Google that shit, props look totally different |
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| Author: | SwampDonkey1 [ Mon Oct 29, 2012 1:16 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
| Author: | Gigafowl [ Mon Oct 29, 2012 2:58 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
| Author: | fowllife08 [ Mon Oct 29, 2012 4:04 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
So like a 9x9 will put me In good standings? |
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| Author: | Gigafowl [ Mon Oct 29, 2012 5:40 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
| Author: | rudyeng [ Mon Oct 29, 2012 6:46 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
Im running a tricked out 13 hp. 36top 44 bott = 1.22 Dixie Mud Motor 1442 alumacraft. 9x9 max 24 mph alone. Slips with load 9x10 custom re-pitch & cup same top speed but slips bad under load 10x6 is the best prop for my boat under all loads. 6% slip. rpms below 3700. good luck. |
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| Author: | fowllife08 [ Mon Oct 29, 2012 6:54 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
24 mph? That's outstanding! I'm close to the same gears. I have 32top and 44 bottom. But as mentioned nowhere near those speeds! |
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| Author: | Gigafowl [ Mon Oct 29, 2012 6:58 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
Good info - are they SD props or LT ??? 24mph is awesome with only a 13hp motor ! He said above he had a 10x8 - do you think he could turn it with his lower gearing ??? |
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| Author: | fowllife08 [ Mon Oct 29, 2012 7:23 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
I think my 10x8 is a lt prop.... and my 9x6 prop came off a lt. What rpms should my motor be seeing? I saw a calculation a while back whatever your rpms on motor were you could figure out what the prop was spinning. Don't remember what it was though. I really appreciate the info guys |
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| Author: | CCC [ Mon Oct 29, 2012 7:58 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
I would think 3800-4300 rpm that's what all my motors ran |
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| Author: | fowllife08 [ Mon Oct 29, 2012 8:08 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
If thats the case it should have no problem spinning the prop I think the prop according to mudbuddys site is rated for 3800-4000.... unless the prop can be overspun? What's that about? |
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| Author: | Gigafowl [ Mon Oct 29, 2012 8:22 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
| Author: | fowllife08 [ Mon Oct 29, 2012 8:37 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
Theoretically speaking.... damn and I'm half of that. I guess ima have to wait on thay damn tach and go from there thanks gigafowl! |
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| Author: | fowllife08 [ Thu Nov 01, 2012 7:51 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
When I hook my tach up do I run that out of the water? Or do I get a reading in the water? |
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| Author: | Gigafowl [ Thu Nov 01, 2012 9:21 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
| Author: | fowllife08 [ Fri Nov 02, 2012 8:58 am ] |
| Post subject: | Re: not settin any speed records! help!!! |
Will I be able to tell out of water if ill be able to turn a 10x8? |
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| Author: | odass [ Fri Nov 02, 2012 9:42 am ] |
| Post subject: | Re: not settin any speed records! help!!! |
I don't think so. He's saying to make sure your motor is running max rpms out of water. To make sure your gov is set right. |
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| Author: | fowllife08 [ Fri Nov 02, 2012 10:03 am ] |
| Post subject: | Re: not settin any speed records! help!!! |
Ok and the norm would be 3800-4200? And if not remove the governor? |
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| Author: | forever draggin [ Sat Nov 03, 2012 9:24 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
Run ur motor on the trailer and see what u can turn up. If u don't turn up 4200 that's part of ur problem, adjust so that u do. Then launch ur rig and see what u r turning up. Wot U wanna b turning up bout 38 39 If ur not turning that high ur not turning ur prop If u over turning u need a bigger prop r pitch The goal u r trying to achieve is turning the biggest prop ur motor can turn There for pushing more water Running faster |
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| Author: | fowllife08 [ Sat Nov 03, 2012 9:39 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
Thanks makes sence now. |
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| Author: | fowllife08 [ Mon Nov 05, 2012 7:19 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
Ok got all my throttle figured out. Removed the governor and hooked up the tach, 5200 comftorable and it could go higher but prolly not safe for motor. What y'all figure it would turn in the water? |
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| Author: | SCmudder7071 [ Mon Nov 05, 2012 11:54 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
5200? And you're comfortable with that? |
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| Author: | fowllife08 [ Tue Nov 06, 2012 5:25 am ] |
| Post subject: | Re: not settin any speed records! help!!! |
Not particularly, thats what I got it to before. I shut it off. Question I was trying to get to was is it enough to spin a 10x8 |
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| Author: | Gigafowl [ Tue Nov 06, 2012 7:37 am ] |
| Post subject: | Re: not settin any speed records! help!!! |
Did you understand that the governor setting was to LIMIT rpms to NO MORE THAN 4200 rpm ??? This protects the motor when it pops out of water unexpectedly.... Sometimes when it is set too LOW it limits at below 3500 - and that is why guys told you to check your out of water rpms.... You need to get that thing set right or you will loose the motor to excess rpms like the 5200 rpms you just turned.... When you are properly setup with the right prop you will be turning between 3500 and 4000 - but no one will be able to tell you anything from what you have posted thus far too many variables.... Now that you have a tach - get out and water test it to find that proper setup - you can post up info with rpms and speeds on different props and then get more input.... |
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| Author: | fowllife08 [ Tue Nov 06, 2012 9:37 am ] |
| Post subject: | Re: not settin any speed records! help!!! |
Thanks giga ill put it back in amd see where I'm at and adjust accordingly. |
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| Author: | sftull [ Tue Nov 06, 2012 12:27 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
You better swap you life jacket out for a Kevlar vest to help protect you when the fly wheel comes apart. 5200 is WAY TOO HIGH for that motor. Running the motor out of the water won't do you any good. All of you tuning needs to be done in the water. |
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| Author: | fowllife08 [ Tue Nov 06, 2012 4:25 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
Ok I got it set on the bench a lil over 4200. But if I meed more in the water I can get it. Is this safer? |
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| Author: | forever draggin [ Tue Nov 06, 2012 10:35 pm ] |
| Post subject: | Re: not settin any speed records! help!!! |
U don't want more than that, ur motor will blow. Ur motor is now set right. At this point everything else is prop. Put it n the water wot and see what Rpms u turn up. |
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