What to power my new boat with

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Richyy31
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What to power my new boat with

Postby Richyy31 » Mon Feb 18, 2019 7:00 pm

Hey I'm new to this site but have a couple questions if you don't mind. I'm in Utah and I'm building a new airboat. I'll be a 16x8 boat and trying to figure out what to power it with. I've been thinking of going with a 383 stroker with about 500hp, but then came across the ls6 motor and know I'm unsure what to do, lol.

CarMotorBarge
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Re: What to power my new boat with

Postby CarMotorBarge » Mon Feb 18, 2019 8:09 pm

Hard to beat a well built LS engine. Tell us about the LS6 you found.
14x7.5 Al David hull with 14 inch transom
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Rich Andrews
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Re: What to power my new boat with

Postby Rich Andrews » Mon Feb 18, 2019 8:15 pm

Even harder to beat a well built SBC :)
I'll have my Manatee burger medium please...just say NObama

14x8 deckover FELBER 397ci.. HP ???..just stay back!!

LOHA is AHOL backwards

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GeeLeDouche
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Re: What to power my new boat with

Postby GeeLeDouche » Tue Feb 19, 2019 7:38 am

I have an LS motor on my Utah style airboat and it is incredible. I personally think they are the best motors available for airboating considering the power to weight ratio. But, like Rich says, its hard to beat a good 383 stroker motor also.
16x8 Utah style hull With a Waterthunder motor W/ 2.3 CH3 reduction swinging a 3 blade 78" R.
&
1648"M (& floatation pods) "Lowe" modified V Jon boat with a 31hp mudbuddy hyperdrive.

Blackcoffee
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Re: What to power my new boat with

Postby Blackcoffee » Tue Feb 19, 2019 9:24 am

That’s a big boat and I only know Florida but I would want more motor. Torque is important and I would not own a boat that big without 700 ft lbs of usable torque. Maybe 540 BB Chevy or a LS that will deliver what you need. Fuel injection for sure.
GTO 14' Deckover

Mossy Cypress
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Re: What to power my new boat with

Postby Mossy Cypress » Tue Feb 19, 2019 9:41 am

Can you post a few pics of the boat?

Sniper
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Re: What to power my new boat with

Postby Sniper » Tue Feb 19, 2019 11:28 am

The LS Engine is the best Airboat motor ever made especially for a boat that size
Sniper You can run but why die tired, If you heard my shot you were not the target
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OneBFC
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Re: What to power my new boat with

Postby OneBFC » Tue Feb 19, 2019 1:28 pm

Blackcoffee wrote:That’s a big boat and I only know Florida but I would want more motor. Torque is important and I would not own a boat that big without 700 ft lbs of usable torque. Maybe 540 BB Chevy or a LS that will deliver what you need. Fuel injection for sure.


:banghead: :banghead: :banghead:

Nothing wrong with having torque, but, you want POWER to build thrust. We go over this so many times on this board. When people say they "need" a high torque motor, what they are indirectly saying is that they want a low RPM motor that still develops enough POWER to produce the thrust they need and/or they desire extreme amounts of "snap" ie, throttle response.

As an example, here's two engines to choose from..

Engine 1: https://www.hotrod.com/articles/hrdp-08 ... dillac-v8/

Engine 2: https://www.hotrod.com/articles/hppp-09 ... ild-part2/

Which one will push your boat better disregarding all the $$$ considerations?

The answer is engine 2 will make considerably more thrust than engine 1. AND, given how propeller thrust to RPM curves are, the lower torque of the smaller engine will never, ever, be felt by the driver. It just takes no power to turn a prop between 100 and 1200 RPM so the snap difference between engine 1 and engine 2 is almost zero.

Find a reliable, affordable and low weight engine that will net you the most POWER and then use a matching gear reduction to go with it and you will be happy.

Today, most people end up with an LS of some flavor when they need more than 400hp or so, though nothing wrong with SBC/BBC if you don't mind what that choice brings with it in the cost/fuel dept. And your boat for sure needs more than 400hp if it weighs what a typical 16x8 weighs. Typically want to maintain about 6lbs (or less) weight per available hp to maintain good dry running capability. I would aim for 4lbs personally given how I like to run and where. Your local conditions really dictate what you need in this regard. So, determine your boat weight before you do anything else.

Good luck to you!

Oh..

Hard to beat a well built LS engine.


JR I'd say it's impossible to beat with currently available engines to normal people like all of us.
-Russ
-----------------------------------
The only thing stopping you is FEAR
400+hp Ecotec, 12x7.6 DBDO, 80" 3B Maximus, 2.3 OX,85+mph, water = purely optional
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