belt drive question

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ls1airboat
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belt drive question

Post by ls1airboat »

did they ever change the bell housing patern on sbc ? i have a 2004. 5.3 that im wanting to put a belt drive on. i see nice used ones on here from time to time..i just wanna make sure they fit a ls motor..thank you. :rebel:

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Bruce
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Re: belt drive question

Post by Bruce »

ls1airboat wrote:did they ever change the bell housing patern on sbc ? i have a 2004. 5.3 that im wanting to put a belt drive on. i see nice used ones on here from time to time..i just wanna make sure they fit a ls motor..thank you. :rebel:
they do
12 foot Mamba "The Underdog"
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21DiamondB
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Re: belt drive question

Post by 21DiamondB »

The housing will be the same, but for an LS you may need a different flex plate to adapt it to your flywheel.
-------- 16.5 x 8 Diamondback - 632ci - Oxbox 2. 55 - Sensenich 5-Blade JX---------

Aeon
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Re: belt drive question

Post by Aeon »

you have to change the lower shaft to a slightly longer one to mate up to the crank..... The housing bolts right up but one it will be one bolt shy of the number that is in the sbc. The LS is missing the bolt at about the 2 o'clock position.
17x8 Circle H powered by a TurnKey LS3, 2.55 ox box and 82" 3 blade JX

ls1airboat
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Re: belt drive question

Post by ls1airboat »

thank you all...if anyone has one for sale im interested. :rebel:

21DiamondB
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Re: belt drive question

Post by 21DiamondB »

There is this one on Craigslist. The ratio he's advertising can't be right. http://houston.craigslist.org/boa/4413543448.html
-------- 16.5 x 8 Diamondback - 632ci - Oxbox 2. 55 - Sensenich 5-Blade JX---------

21DiamondB
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Re: belt drive question

Post by 21DiamondB »

There is this one on Craigslist. The ratio he's advertising can't be right. http://houston.craigslist.org/boa/4413543448.html
-------- 16.5 x 8 Diamondback - 632ci - Oxbox 2. 55 - Sensenich 5-Blade JX---------

Chaseh
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Re: belt drive question

Post by Chaseh »

That one is legit. They bought it for a diesel boat project that they never finished

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ls1airboat
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Re: belt drive question

Post by ls1airboat »

thank you everyone...i sent him a email...just waiting for a reply.

One Eyed Gator
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Re: belt drive question

Post by One Eyed Gator »

1.53 is not really what you want for a 5.3 build. If you want to spin a decent size prop you need 2.37 or high ratio. That ratio is more of a caddy and BBC type ratio.

We just put a 2.68 on a 99 5.3 with a carb kit and it is turn a 78" 2 blade maxius set past 2 motor is turning 5600. 78" Only because of cage limits.

But it runs good on a heavy deck-over we did 54 mile and burned 14 gal.

Aeon
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Re: belt drive question

Post by Aeon »

That will not work, to run even a 2.00 you need a stroked ls3 and that is not exactly ideal at all.

with lets say a prop that spins 2450rpm max your motor would only spin 3748rpm with a 1.53.
17x8 Circle H powered by a TurnKey LS3, 2.55 ox box and 82" 3 blade JX

ls1airboat
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Re: belt drive question

Post by ls1airboat »

i see the most common belt drive is 2 to 1...would that work for me ?...so if the prop is at 3000 rpm the engine is at 6000.

21DiamondB
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Re: belt drive question

Post by 21DiamondB »

Just for the record, I was thinking the ratio he posted was a mistake. You don't ever see a beltdrive with that kind of ratio. I would never suggest that ratio.
-------- 16.5 x 8 Diamondback - 632ci - Oxbox 2. 55 - Sensenich 5-Blade JX---------

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Deano
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Re: belt drive question

Post by Deano »

As was said, they made the 1.5 for the diesels;
they also made a 1.77 for the Caddys.
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but it is not the path to knowledge; it has no place in the endeavor of science."
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SWAMPHUNTER45
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Re: belt drive question

Post by SWAMPHUNTER45 »

Deano will the 1:5 ratio Century fit up with the Caddy ?

I know the 1.5 is a freak compared to the others they make. Pulleys don't swap to change ratios. The 1.7 and 2.0 can change ratios.

Aeon
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Re: belt drive question

Post by Aeon »

ls1airboat wrote:i see the most common belt drive is 2 to 1...would that work for me ?...so if the prop is at 3000 rpm the engine is at 6000.
If you are going to get a bad ass stroked LS then yes it will work, I more or less did just that with my boat. I had a BBC and a 2:1 belt with a 78" 3blade falcon on it. My motor is a stroked 427ci LS3. i ran out of funds and time to change to a 2.3 so i just left it with the 2:1. I expected this motor to spin the prop off the boat but the LS motors need to spin up a bit more than a stroked BBC to get the TQ to the prop. With a 2.3 or greater reduction i could swing a much much bigger prop. This is exactly what waterthunder told me by the way. It works but its not overpowering the prop. at 5k rpm my motor makes 530hp and 550flb tq.

You will be unhappy with a 450hp LS and a 2:1 box of any kind......
17x8 Circle H powered by a TurnKey LS3, 2.55 ox box and 82" 3 blade JX

ls1airboat
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Re: belt drive question

Post by ls1airboat »

will a 2 to 1 belt drive work with a stock ls engine with about 325 hp ?..im not looking to make a race boat.. just a decent running boat thats going to last awhile..im going to run it stock for a lil while then maybe just do small things like a cam..this motor is not a carb motor..im running it just like it came out of the truck with all the electronics and efi.

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Bruce
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Re: belt drive question

Post by Bruce »

Itll be ok but a 2.3 would be night and day different
12 foot Mamba "The Underdog"
Tired Gpu 520,Whirlwind Razor X

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muzzyboy
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Re: belt drive question

Post by muzzyboy »

Im running a 1.7:1 on my 5.7 with a 78" 2 blade WT and love it. WOT is 4000, great push and good fuel consumption.
http://www.southernairboat.com/phpBB3/v ... 48&t=56273

flying fish
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Re: belt drive question

Post by flying fish »

450 hp and a 2 to 1 reduction will perform amazingly well on the right boat.

Many many 14-16' boats where I run with less horse power running the 2 to 1 reduction.

GTO'S, Diamondbacks and Airrangers. Factory combinations. All run very respectable.

Must be the blades I guess? Stump pullers, R's and Falcons.

Maybe most popular combo ever?? :)
15' DB - 6.2 LSA - 4 blade 82" R - 2.52 CH-4

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