Turbo LS vs 496

Automotive powered airboat discussion.
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TheExtreme
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Turbo LS vs 496

Postby TheExtreme » Wed Oct 11, 2017 2:52 pm

This may have been beat to death but I'm just wanting weight all of my options. Lost block on 496 stroker. Edelbrock heads, H-beam, forged, all good stuff. Buddy is gonna give me a 4 bolt block. I am having trouble making up my mind if I want to rebuild the 496 or sell the heads/stroker kit, etc. and build a turbo LS. Out of pocket would be about the same, a little more for the LS. Boat is an 18x8 Diamondback. Has anybody made the switch? Any info or advise would be greatly appreciated.


Scott
Scott

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OneBFC
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Re: Turbo LS vs 496

Postby OneBFC » Wed Oct 11, 2017 6:31 pm

Well, it kind of depends on what you use the boat for and what kind of power you are looking to make.

The forced induction setup has very high power potential but comes with system complexity that some people dislike.

I have always preferred forced induction over displacement.

But, its hard to look past the simplicity of big displacement.

Personal choice imo. I think most will say go with the bigger motor.

Good luck with the build!
-Russ
-----------------------------------
The only thing stopping you is FEAR
400+hp Ecotec, 12x7.6 DBDO, 80" 3B Maximus, 2.3 OX,70+mph, water = purely optional
Life begins at 2 BAR, Just a good ole boy

BGREEN427
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Re: Turbo LS vs 496

Postby BGREEN427 » Wed Oct 11, 2017 6:51 pm

Are you just using a stock motor ls? Dont see how it would cost the same after buying an ls,turbo, exhaust,pulleys, tuning it,electronics.

SWAMPHUNTER45
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Re: Turbo LS vs 496

Postby SWAMPHUNTER45 » Thu Oct 12, 2017 4:29 am

A big heavy boat needs a strong well built big inch engine!

Sure you can force induction a mouse but in the end your running the balls off it and durability / longevity will suffer.

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Re: Turbo LS vs 496

Postby One Eyed Gator » Thu Oct 12, 2017 7:32 am

If i was going LS forced induction I would look into the superchaged LS over a turbo personally, they run well and has a nice torque curve. They also seem to hold up well even with a stock bottom end. Also an aluminum LS is much lighter than any BBC even with aluminum heads 150 lbs or better.

But also depend on your current prop and gearbox.

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TheExtreme
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Re: Turbo LS vs 496

Postby TheExtreme » Thu Oct 12, 2017 9:17 am

Thanks to all for the info. My biggest problem with the turbo setup is that it is not all that aesthetically pleasing. Some are downright ugly.
Scott

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THE NIGHT RIDER
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Re: Turbo LS vs 496

Postby THE NIGHT RIDER » Thu Oct 12, 2017 9:48 am

Jmo but id say just rebuild tje bigblock as swamphunter says because that is a huge boat it needs big cubes to move it and stay durable ,i run an ls from bigblock i had to change my engine stand to fit the motor mounts did not cross over so that will be an issue along with gathering all the parts to convert ,id say your cheapest and easiest way is rbuild ur stroker bb and just bolt it back on ,an ls is a great engine but all the things to convert is a big price .nothing interchanges from old school smallblocks to ls ,new headers for anotjer thing are 700 bucks .stik with the bigblock u will be saving money to put in the feul tank .....

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Re: Turbo LS vs 496

Postby jeepinocala1111 » Thu Oct 12, 2017 12:30 pm

SWAMPHUNTER45 wrote:A big heavy boat needs a strong well built big inch engine!

Sure you can force induction a mouse but in the end your running the balls off it and durability / longevity will suffer.


100% correct. :cheers:

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Re: Turbo LS vs 496

Postby bob_esper » Thu Oct 12, 2017 2:54 pm

It depends on your needs. i have a 6.0 in my 18/8 alumitech. Boat will cruise 30 at 34-3500rpm and run 50 at 5000. Will it run the hill? nope, but its smooth and good on fuel.
2017 18.5/8 alumitech
L96 6.0 Ls
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TheExtreme
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Re: Turbo LS vs 496

Postby TheExtreme » Fri Oct 13, 2017 10:03 am

Thanks for the info, guys. It's hard to beat a big block. Torque, looks, sound.
Scott

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Re: Turbo LS vs 496

Postby SWAMPHUNTER45 » Fri Oct 13, 2017 11:39 am

Really for a large heavy boat you can not beat a large (big inch) displacement engine. We have seen guys on here who went from BBC to blown LS and it worked but they had an issue. Not to name any names but another key piece is getting a purpose built engine (airboat) is vital to finding long term success.

For a big heavy or huge boat there has been a lot said about the 540 inch. A long stroke is something to look for if torque is your objective.

The famous saying of a master engine builder is the proof is in the prop. Not a dyno sheet or what someone tells you but what prop an engine can turn and at what ratio and setting. When you can spin 4 big wide "S" blades pitched up past 2 1/2 your moving a lot of air and the results are a boat that can reliably run ground loaded. This also will be efficient and tend to be done with less noise.

There's a reason MAS and Branch are focused on 540 and 542 inch builds. They work moving big heavy boats and stay together when built correctly. Just my 2 cents.....SWAMP out

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kwanjangnihm
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Re: Turbo LS vs 496

Postby kwanjangnihm » Fri Oct 13, 2017 3:01 pm

SWAMPHUNTER45 wrote: big inch & a long stroke

words I have always lived by!! :cheers: :salute: :toothy7:
" I don't care who you are back in the world, you give away our position one more time, I'll bleed ya, real quiet. Leave ya here. Got that? "

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TheExtreme
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Re: Turbo LS vs 496

Postby TheExtreme » Fri Oct 13, 2017 8:08 pm

SWAMPHUNTER45 wrote:Really for a large heavy boat you can not beat a large (big inch) displacement engine. We have seen guys on here who went from BBC to blown LS and it worked but they had an issue. Not to name any names but another key piece is getting a purpose built engine (airboat) is vital to finding long term success.

For a big heavy or huge boat there has been a lot said about the 540 inch. A long stroke is something to look for if torque is your objective.

The famous saying of a master engine builder is the proof is in the prop. Not a dyno sheet or what someone tells you but what prop an engine can turn and at what ratio and setting. When you can spin 4 big wide "S" blades pitched up past 2 1/2 your moving a lot of air and the results are a boat that can reliably run ground loaded. This also will be efficient and tend to be done with less noise.

There's a reason MAS and Branch are focused on 540 and 542 inch builds. They work moving big heavy boats and stay together when built correctly. Just my 2 cents.....SWAMP out


My 496 ran great before. I like big motors. Thanks for the info.
Scott

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Re: Turbo LS vs 496

Postby Aeon » Sun Oct 15, 2017 5:24 pm

they make adapters so you can mount a LS block on a SB/BB motor stand. They work great and are not expensive so that much is solved.

How much HP do you need to make?
17x8 Circle H with a LS3 spinning a oxbox and JX to be complete very soon

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TheExtreme
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Re: Turbo LS vs 496

Postby TheExtreme » Wed Oct 18, 2017 2:09 am

496 comes in at about 550/650t so at least that much.
Scott

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OneBFC
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Re: Turbo LS vs 496

Postby OneBFC » Wed Oct 18, 2017 2:22 pm

Don't even need forced induction to have a 550hp LS. pretty much a normal power level for them these days.
-Russ
-----------------------------------
The only thing stopping you is FEAR
400+hp Ecotec, 12x7.6 DBDO, 80" 3B Maximus, 2.3 OX,70+mph, water = purely optional
Life begins at 2 BAR, Just a good ole boy

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Re: Turbo LS vs 496

Postby CarMotorBarge » Wed Oct 18, 2017 2:27 pm

Hey Russ. Need 650 in torque. Isn't torque more important than HSP. :stirpot: :stirpot: :stirpot: :stirpot: :stirpot: :stirpot:
14x7.5 Al David hull with 14 inch transom
419 CI Horsepower Barn LS3 with 2.68 Rotator soft drive swinging 4 blade 83.5" R
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OneBFC
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Re: Turbo LS vs 496

Postby OneBFC » Wed Oct 18, 2017 2:30 pm

Don't spring the trap early!
-Russ
-----------------------------------
The only thing stopping you is FEAR
400+hp Ecotec, 12x7.6 DBDO, 80" 3B Maximus, 2.3 OX,70+mph, water = purely optional
Life begins at 2 BAR, Just a good ole boy


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