anyone running a 350 with 2.1 box?
- Slidin Gator
- Site Supporter - IV
- Posts: 1033
- Joined: Sat Feb 03, 2018 11:33 pm
- Location: Jupiter Farms, Florida
Re: anyone running a 350 with 2.1 box?
So the argument for killing the torque myth is the perfect torque curve? I guess it's just arguing for the sake of making noise.
I'm just gonna scratch the Ecotec of my list of future engines. There are many factors to consider when buying, #1 in this case is the salesman.
I'm just gonna scratch the Ecotec of my list of future engines. There are many factors to consider when buying, #1 in this case is the salesman.
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
Re: anyone running a 350 with 2.1 box?
I am sure the ecotec sales person will or would be devastated? LS engine comparison is far and away even more obvious which is better from a performance perspective.
I am not selling anything but knowledge.
Use it how you wish. Not meant any other way.
I am not selling anything but knowledge.
Use it how you wish. Not meant any other way.
-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
Life begins at 2 BAR, Just a good ole boy
-----------------------------------
The only thing stopping you is FEAR
400+hp Ecotec, 12x7.6 DBDO, 80" 3B Maximus, 2.3 OX,85+mph, water = purely optional
Life begins at 2 BAR, Just a good ole boy
Re: anyone running a 350 with 2.1 box?
Torque is nothing but cylinder pressure x cylinder area x crank lobe offset
It is absolutely useless number w/o rpm being involved and torque x rpm = HP
If you want to run your engine at high torque which equals high cylinder pressure and lug the motor all the time... by all means let it blow!
That's my $0.02
It is absolutely useless number w/o rpm being involved and torque x rpm = HP
If you want to run your engine at high torque which equals high cylinder pressure and lug the motor all the time... by all means let it blow!
That's my $0.02
12x7'6" American Airboat
1.4L GM Ecotec - BNR GTX250 Turbo
2:1 Century Ecotec Drive
2-bld Whisper Tip 72
"Nothin' as Fine as Hearing a Turbo Whine"
1.4L GM Ecotec - BNR GTX250 Turbo
2:1 Century Ecotec Drive
2-bld Whisper Tip 72
"Nothin' as Fine as Hearing a Turbo Whine"
-
- Site Supporter - III
- Posts: 3055
- Joined: Thu Nov 21, 2013 11:38 am
- Location: Naturecoast, Florida
Re: anyone running a 350 with 2.1 box?
Torque equals usable power, horsepower is great...luv it... but... don't need the noise and don't like to wait for my snap!
- kwanjangnihm
- Site Supporter - IV
- Posts: 2168
- Joined: Sat Mar 30, 2013 8:23 pm
- Location: Bartow FL
Re: anyone running a 350 with 2.1 box?

He'll cut your throat, baby, stick you in the back, drive off in your Cadillac.
He's more trouble than you think, he'll kill your sugar, leave you in the drink.
He's more trouble than you think, he'll kill your sugar, leave you in the drink.
Re: anyone running a 350 with 2.1 box?

"The suppression of uncomfortable ideas may be common in religion and politics,
but it is not the path to knowledge; it has no place in the endeavor of science." - Carl Sagan
but it is not the path to knowledge; it has no place in the endeavor of science." - Carl Sagan
- Slidin Gator
- Site Supporter - IV
- Posts: 1033
- Joined: Sat Feb 03, 2018 11:33 pm
- Location: Jupiter Farms, Florida
Re: anyone running a 350 with 2.1 box?
Deano wrote:









About busted a gut on that one

I guess no one else has any actual useful input for Keeth? Consensus is get another 350 motor with a 2:1 for cheap and get on with it?
I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
Re: anyone running a 350 with 2.1 box?
Yep, I agree. No messing with rigging or any other cans of worms when you go changing stuff.Consensus is get another 350 motor with a 2:1 for cheap and get on with it?
Done and back to sliding.
-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
Life begins at 2 BAR, Just a good ole boy
-----------------------------------
The only thing stopping you is FEAR
400+hp Ecotec, 12x7.6 DBDO, 80" 3B Maximus, 2.3 OX,85+mph, water = purely optional
Life begins at 2 BAR, Just a good ole boy
-
- Site Supporter - III
- Posts: 3055
- Joined: Thu Nov 21, 2013 11:38 am
- Location: Naturecoast, Florida
Re: anyone running a 350 with 2.1 box?
I would be looking for a 383 or 400 since they make more TORQUE!
- Slidin Gator
- Site Supporter - IV
- Posts: 1033
- Joined: Sat Feb 03, 2018 11:33 pm
- Location: Jupiter Farms, Florida
Re: anyone running a 350 with 2.1 box?
See Keeth, consensus is to gear that 350 and turn it. Sure, you gotta change all the rigging to turn a bigger prop (gotta buy that after all), move the motor stand forward to make room for the belt drive. Probably change the seating and rigging to make room for the engine, now moved forward. Yep, throw some gear at the problem and make some damn Hp! Hp is free and all.
Wait, my right hand man is talking, damn Torque Devil. What's that Swamp, uh, I mean Devil?
Keeth, time to pick a team,
Just like Smokey the Bear said about preventing Forest fires:

Wait, my right hand man is talking, damn Torque Devil. What's that Swamp, uh, I mean Devil?
Keeth, Unbelievable as it sounds, there is another option. It turns out for a bit more money vs. a stock reman you can build a 383 stroker and wake your rig right up! Seriously, Keeth can keep all your stuff the same, just rebuild the bottom end with a stroker package and find some throw away 305 heads to make compression? Turns out that this will make more Torque and I now understand that higher torque at 2,850 RPM actually equals increased Hp! What a trip, I learn something new every daySWAMPHUNTER45 wrote:I would be looking for a 383 or 400 since they make more TORQUE!

Keeth, time to pick a team,

Just like Smokey the Bear said about preventing Forest fires:

I still think I-10 is the Mason Dixon line.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
2013 Mike Stossel Boats, 13' x 7' deck over, IO-540, 74" NGQ less winglets.
-
- Site Supporter - III
- Posts: 3055
- Joined: Thu Nov 21, 2013 11:38 am
- Location: Naturecoast, Florida
Re: anyone running a 350 with 2.1 box?
I have seen a 13ft glass boat running around with a junk yard sbc take out that ran very well.
1973 Chevy 400 with a 2 barrel Rochester carburetor, it came out of a 4 dr Caprice Classic. Had long tube headers and a HEI upgrade with good curve.
Ran dry with 2 adults like it was no trouble at all
1973 Chevy 400 with a 2 barrel Rochester carburetor, it came out of a 4 dr Caprice Classic. Had long tube headers and a HEI upgrade with good curve.
Ran dry with 2 adults like it was no trouble at all
-
- Site Supporter - I
- Posts: 349
- Joined: Fri May 16, 2008 8:54 pm
- Location: Polk County
- Contact:
Re: anyone running a 350 with 2.1 box?
Well I currently run a 400 with a belt box. Does really well for me. I only started this thread because I had to do some fixing. Had to replace the head gaskets because I think the steam holes worked one loose.
. Put in some high dollar gaskets, aluminum locking rockers, new rods and lifters. Running great again. I just like to read the posts lol
. Put in some high dollar gaskets, aluminum locking rockers, new rods and lifters. Running great again. I just like to read the posts lol

-
- Site Supporter - III
- Posts: 3055
- Joined: Thu Nov 21, 2013 11:38 am
- Location: Naturecoast, Florida
Re: anyone running a 350 with 2.1 box?
They don't like a lot of rpm but they are a great engine
-
- Site Supporter - III
- Posts: 538
- Joined: Mon Aug 11, 2014 10:05 pm
- Location: Loxahatchee
Re: anyone running a 350 with 2.1 box?
Looks like we may have attended the same schoolskwanjangnihm wrote:according to my AC pocket protected fuzzy math excel calculator the engines have equal power and both exceed waterthunder thrust expectationsOneBFC wrote: 500lbft/ 400hp turns way way less prop and makes way less thrust than 400lbft/500hp![]()
I challenge any CM calculators to prove me wrong!!
![]()
![]()
![]()
![]()
![]()
![]()
![]()
![]()
thrust.PNG

12' Open Palm Beach, IO-0470-L 260hp, 72" NGQ
-
- Site Supporter - III
- Posts: 538
- Joined: Mon Aug 11, 2014 10:05 pm
- Location: Loxahatchee
Re: anyone running a 350 with 2.1 box?
Birddog247 on this site runs an old 350 that he pulled from a van, 2:1 gearbox, 2 blade R, on an aluminum hull, and I've yet to see him sruggle on the hill with 2-3 people. The belt box in question weighs more than his gear box, but the combo operates the same. Set-up would dictate how it performs, but the generic question was "anyone running a 350 with a 2:1 box", and I'm sure there are plenty of boats running that combination. Set up right, it can be a point and go combo.
12' Open Palm Beach, IO-0470-L 260hp, 72" NGQ
- digginfool
- Site Supporter - III
- Posts: 2763
- Joined: Wed Jun 05, 2013 3:00 pm
- Location: South Florida
Re: anyone running a 350 with 2.1 box?
Not only does Pat run it, Spencer does, too (I believe his ratio is actually 2.09:1 but close enough), although he's got a 5.3 he's mulling over replacing the 350 with.flcracker9 wrote:Birddog247 on this site runs an old 350 that he pulled from a van, 2:1 gearbox, 2 blade R, on an aluminum hull, and I've yet to see him sruggle on the hill with 2-3 people. The belt box in question weighs more than his gear box, but the combo operates the same. Set-up would dictate how it performs, but the generic question was "anyone running a 350 with a 2:1 box", and I'm sure there are plenty of boats running that combination. Set up right, it can be a point and go combo.
“When plunder becomes a way of life for a group of men living together in society, they create for themselves in the course of time a legal system that authorizes it and a moral code that glorifies it” - Bastiat
- kwanjangnihm
- Site Supporter - IV
- Posts: 2168
- Joined: Sat Mar 30, 2013 8:23 pm
- Location: Bartow FL
Re: anyone running a 350 with 2.1 box?
always worth repeating on the weights of gearboxes
CH3 Belt Box
Upper Unit----60lbs
Lower Unit with bearing----23 lbs
Main Housing-------42lbs
All bolts and belt----7lbs
Total---------132lbs
Rotator Gear Box 70lbs

CH3 Belt Box
Upper Unit----60lbs
Lower Unit with bearing----23 lbs
Main Housing-------42lbs
All bolts and belt----7lbs
Total---------132lbs
Rotator Gear Box 70lbs

He'll cut your throat, baby, stick you in the back, drive off in your Cadillac.
He's more trouble than you think, he'll kill your sugar, leave you in the drink.
He's more trouble than you think, he'll kill your sugar, leave you in the drink.