2.3:1 vs 2:1 belt drive

Automotive powered airboat discussion.
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Basin_Runner355
Southern Airboat Member
Posts: 202
Joined: Sun Nov 13, 2016 7:16 am
Location: St.martinville , Louisiana

2.3:1 vs 2:1 belt drive

Post by Basin_Runner355 »

I got a 350 puanin 430 hp at 5000 dyno tuned so it’s not made up numbers. I find it don’t take much to stop me in my tracks so I’m thinking a 2.3 will help but im hearing ppl some like the 2:1 and some like the 2.3:1. Just wanna hear from ppl that ran both and see what y’all think 14ff diamond back
14ft diamond back mild zz4 355sbc pushin 450 hp 450 TQ 2:1 belt drive reduction with a 3 blade sensenich 78Jw series

Basin_Runner355
Southern Airboat Member
Posts: 202
Joined: Sun Nov 13, 2016 7:16 am
Location: St.martinville , Louisiana

Re: 2.3:1 vs 2:1 belt drive

Post by Basin_Runner355 »

Main thing is i like my cruise rpm which is about 3400 i don’t wanna have to turn 4,000 in deep water
14ft diamond back mild zz4 355sbc pushin 450 hp 450 TQ 2:1 belt drive reduction with a 3 blade sensenich 78Jw series

unforgiven11B
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Re: 2.3:1 vs 2:1 belt drive

Post by unforgiven11B »

My friend has a 16x8 DB with 350 330hp/330tq I believe that is some where around 56-5800ish rpm he swings a 3 blade R with 2.38 belt box. My boat is 16x8 HEAVY DB with 6.0 LS 365ish hp maybe 3 blade K series 2.1:1 belt. Both have been stuck but neither struggle on dry we can go where ever we want white reason. The k series was replaced by the R which is 1” wider.

Basin_Runner355
Southern Airboat Member
Posts: 202
Joined: Sun Nov 13, 2016 7:16 am
Location: St.martinville , Louisiana

Re: 2.3:1 vs 2:1 belt drive

Post by Basin_Runner355 »

I talked with Darren at sensenich today he told me the blades i got don’t start pushing good until they at 18 degrees of push and im only at 14 at 5200 i put them at 16 only turns 4800 on the trailer i dint run in the water yet. But i don’t think i have quite enough motor to turn the 3 blade like it needs to be be turned. With a 2:1. Wondering how much more pitch i can put in the prop with. 2.3 gear
14ft diamond back mild zz4 355sbc pushin 450 hp 450 TQ 2:1 belt drive reduction with a 3 blade sensenich 78Jw series

swamper2
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Posts: 432
Joined: Mon Apr 12, 2010 8:05 pm
Location: harsens island michigan

Re: 2.3:1 vs 2:1 belt drive

Post by swamper2 »

go with the 2.3 you won't be sorry
16ft alumitech/406sbc/2.38w/3-80in.R's

Basin_Runner355
Southern Airboat Member
Posts: 202
Joined: Sun Nov 13, 2016 7:16 am
Location: St.martinville , Louisiana

Re: 2.3:1 vs 2:1 belt drive

Post by Basin_Runner355 »

Think I’ll be add a good bit more pitch don’t wanna do it if ima only get to add a couple degrees
14ft diamond back mild zz4 355sbc pushin 450 hp 450 TQ 2:1 belt drive reduction with a 3 blade sensenich 78Jw series

Basin_Runner355
Southern Airboat Member
Posts: 202
Joined: Sun Nov 13, 2016 7:16 am
Location: St.martinville , Louisiana

Re: 2.3:1 vs 2:1 belt drive

Post by Basin_Runner355 »

With the gear and the belt gonna be around $800
14ft diamond back mild zz4 355sbc pushin 450 hp 450 TQ 2:1 belt drive reduction with a 3 blade sensenich 78Jw series

swamper2
Southern Airboat Member
Posts: 432
Joined: Mon Apr 12, 2010 8:05 pm
Location: harsens island michigan

Re: 2.3:1 vs 2:1 belt drive

Post by swamper2 »

It's only money. There is more coming down the road.
16ft alumitech/406sbc/2.38w/3-80in.R's

Wingshooter
Southern Airboat Member
Posts: 6
Joined: Tue Jul 17, 2012 10:00 am

Re: 2.3:1 vs 2:1 belt drive

Post by Wingshooter »

I have a big block 516 675hp running a 4 blade and it made a good difference on mine. I think it was $1200 total for the belt and reduction

ACO1209
Southern Airboat Member
Posts: 12
Joined: Wed Sep 26, 2018 8:12 am

Re: 2.3:1 vs 2:1 belt drive

Post by ACO1209 »

I was able to add 4 degrees of pitch on mine when i tried the 2.3:1 with my 80" JW a couple weeks ago. You have a little more power than i do and smaller diameter JW so my guess would be 5-7 degrees more than where your at from what i seen with it recently.

Basin_Runner355
Southern Airboat Member
Posts: 202
Joined: Sun Nov 13, 2016 7:16 am
Location: St.martinville , Louisiana

Re: 2.3:1 vs 2:1 belt drive

Post by Basin_Runner355 »

ACO1209 wrote:
Tue Oct 01, 2019 3:00 pm
I was able to add 4 degrees of pitch on mine when i tried the 2.3:1 with my 80" JW a couple weeks ago. You have a little more power than i do and smaller diameter JW so my guess would be 5-7 degrees more than where your at from what i seen with it recently.
I sent you a PM.
14ft diamond back mild zz4 355sbc pushin 450 hp 450 TQ 2:1 belt drive reduction with a 3 blade sensenich 78Jw series

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