Duramax Diesels Forum Truck of the Week
  #31  
Old 06-07-2016, 12:37 PM
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Can't you get the prop over driven enough to compensate foe the low rpms? Even something custom build sounds cheaper/ better then getting the motor to live at that load.
Why are EGTS an issue at those RPMs?

I'm learning here too. I hate the water/boats, but this sounds cool

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  #32  
Old 06-07-2016, 02:23 PM
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Quote:
Originally Posted by 04LB7yz View Post
You can swap lower gears on the 6's to a 1:1 if im not mistaken

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Were is "way north MN" ? I am from OKLEE, MN , about 45 min south of CANADA
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  #33  
Old 06-07-2016, 02:33 PM
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When I joined this forum and put that on here i lived in Bagley MN which is south east of you probably a half hour or so... Now I live about an hour north of the cities
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  #34  
Old 06-07-2016, 03:16 PM
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Quote:
Originally Posted by Dozerboy View Post
Can't you get the prop over driven enough to compensate foe the low rpms? Even something custom build sounds cheaper/ better then getting the motor to live at that load.
Why are EGTS an issue at those RPMs?

I'm learning here too. I hate the water/boats, but this sounds cool

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The drives I've switched to use straight cut gears that you can set to about any ratio you imagine. BUT, imagine your truck having no transmission and only what gears you setup the rear end with. Now hook to a trailer... lol

Hence the 2 spd trans options.
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  #35  
Old 06-07-2016, 05:36 PM
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  #36  
Old 06-07-2016, 07:46 PM
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It still seems to me that "gearing" via props & transmissions and a build that can make the power you need without being at full load is the only shot. I'd be blown away if there's any duramax on the planet that can live at or near full power over 1000 prop hp for even 10min straight let alone hours at a time. If that's the requirement, I can't wait to see what the build consists of & how long it lasts!!
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  #37  
Old 06-07-2016, 08:29 PM
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The big blocks can do it so I don't doubt a duramax can as well. I work with 1200 to 1500 hp diesels everyday that run at 80% load for 2+ hours straight. Granted they are huge but so are the boats they push...
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  #38  
Old 06-07-2016, 10:21 PM
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Wonder if one could find a set of the turbo 400's, and adapt into it. Set them up with no converters to do away with lockup concerns. Everybody says the 4L80E's weak point is OD, the 400 is basically teh same without OD, and theres plenty of drag trucks running them with big HP. It might would allow for dropping into 3rd say for cruise, but use 2nd for acceleration. I know they make the 2 speeds as well, jsut throwing out an idea that may be more advantagous in the long run tuning scheme. The limited RPM range coupled with the added cylinder pressure will be the killer here. Most don't realize just how hard it is to push a boat for hours on end, and have an engine live. Imagine dragging 80K lbs up a 6% grade for HOURS non stop.
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  #39  
Old 06-07-2016, 10:44 PM
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PPE did a hub drive variant with a Dmax/Allison.
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  #40  
Old 06-07-2016, 11:29 PM
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Quote:
Originally Posted by malibu795 View Post
PPE did a hub drive variant with a Dmax/Allison.
I seen the youtube videos of it. Just thinking the 400 would be lighter, should be up to the challenge, and less parasitic loss.
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  #41  
Old 06-08-2016, 08:54 AM
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I missed out on pair of trans I wanted to use with 1.5 first and 1.0 second. Next choice is these COAN XMT units based off a powerglide.



I've been helping get a friends boat running with a 6sp Allison, it's been a pain. Getting one to shift correctly and hold gears in a boat has proven harder than I imagined. So trying to get 2 of them to shift at exact same time, and play nice together is more than I wish to tackle this month.
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  #42  
Old 06-08-2016, 09:05 AM
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What's your timeline on this puppy
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  #43  
Old 06-08-2016, 09:48 AM
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12 weeks to have it rigged and be on the water. At least in time to make the Cumberland poker run and maybe go to LOTO if the client wants. Then she gets shipped home to Australia, just in time for summer boating season over there..
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  #44  
Old 06-08-2016, 09:48 AM
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Two questions,

how large of a fuel tank is on this boat? two engines running near 1000 hp for potentially hours, how much fuel is it going to drink in that time?

2nd, would a Gear Vendors unit be of any help for gearing?
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  #45  
Old 06-08-2016, 11:16 AM
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cumberland poker run... as in Lake Cumberland in KY???


Are there any billet blocks available so they might be repairable/salvageable if/when engine internals let go?


Given the short time period to achieve this... I imagine you have a game plan in place for the engines by now... So whats the plan?!?!
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