View Full Version : My carbed ls3 stroker


LS3airboat
11-05-2010, 11:08 PM
Hey guys, not a big poster on lstech, but I thought you car guys might like to take a look at my new LS motor I had built for my airboat.
4340 forged 4'' crank, ACL/Kings main bearings ARP PRO main studs
http://southernairboat.com/photopost/data/500/DSC_01262.JPG

6.2 block, 4340 4'' stroke crank, 4340 H beam 6.125 full floating bushed rod's, custom forged pistons, total seal file fit rings, ARP pro Main Studs, ACL bearings
http://southernairboat.com/photopost/data/500/DSC_01304.JPG

http://southernairboat.com/photopost/data/500/DSC_01322.JPG

http://southernairboat.com/photopost/data/500/DSC03502.JPG
LS3 block with a 4340 forged 4'' stroke crank, with 4340 full floating bushed H beam rod's with ARP rod bolts, Forged flat top pistons with Total Seal file fit rings, ARP Pro Main Studs this combo come to 418 cubic inches. Demon 850 cfm carb with annular boosters sitting pretty on top of a spider intake. We're making over 600hp with this combo! It spins a 4 blade R series carbon fiber prop(13''x82'') up to 5600rpms with 12 degrees of pitch in it. All that goes through a 2.68 to 1 gearbox

LS3airboat
11-06-2010, 12:02 AM
oh yeah, I almost forgot. We built this to be a pump gas motor and so far it is just that! Ran great on the thrust tester with 93 octane.

1 FMF
11-08-2010, 12:48 PM
what are you running for ignition?

ZONES89RS
11-08-2010, 09:27 PM
That is a sick ass motor man, i am going to move this to the new carbed section, this is(was) the old SBC section.

Oldsmobility85
11-09-2010, 09:20 AM
That's awesome. You air boat guys are crazier than car guys. LOL.

LS3airboat
11-09-2010, 09:32 AM
what are you running for ignition?

stand alone programmable ignition controller, gm coils.

RENE'S RAGE
11-10-2010, 07:22 PM
Way to fast on water for me.
What brand pistons and are they 4.080.

LS3airboat
12-10-2010, 06:09 PM
http://southernairboat.com/photopost/data/500/712.jpg
http://southernairboat.com/photopost/data/500/mountprogress.jpg
http://southernairboat.com/photopost/data/500/911.jpg
http://southernairboat.com/photopost/data/500/891.jpg
http://southernairboat.com/photopost/data/500/671.jpg

dmracing
12-11-2010, 12:14 AM
How fast does something like this go?

Pop N Wood
12-11-2010, 09:16 AM
That thing is pretty.

Hard to believe you will keep it right side up with all that motor.

396D1SS
12-11-2010, 09:37 AM
crazy

allblowdup
12-11-2010, 10:16 AM
A few questions. What heads are you using and what are the cam specs? How much timing do you run for pump 93 octane? What comp is it. My power requirements are simular to yours but it is a jet boat.

LS3airboat
12-12-2010, 02:40 PM
A few questions. What heads are you using and what are the cam specs? How much timing do you run for pump 93 octane? What comp is it. My power requirements are simular to yours but it is a jet boat.

The motor was built in florida by a company called Waterthunder proformance, they specalize in LS motors for airboat use. Though they have built engines for drag cars, jet, boats, drag airboats, and airboats. I'm currently in Iraq and I've yet to lay my eyes on the motor and I wasn't involed to much in the build up of it. Dave has done tones of R&D on his custom cam grinds from carbed and EFI engine and I don't think he'll be giving out the specs. The heads are L92.

You can check out his website www.waterthunder.com (www.waterthunder.com) or even give him a call, but he's an engine builder and all the R&D he has done puts food on his table, I doubt he'll give any info up at all unless your considering buying a motor from him.

you can also see more pictures of the engine/boat build on my site, www.bullshithill.org

LS3airboat
12-12-2010, 02:46 PM
How fast does something like this go?

My boat is pretty big(8'x16') and it really isn't built for speed. If I took this motor and put it on a small hull I could make it scream. I haven't got it on the water yet but it will be around 40-50mph. The boat will also pretty much go anywhere on dry land and up hills.

The drag racing airboats run a 400' track and top out around 98 mph in the unlimited class in 400'. They'll goes faster, but the get pretty squirrly and it takes some balls to stay in the gas to get up to higher speeds.

LS_10
12-12-2010, 03:04 PM
Hot Damn that's sexy!

allblowdup
12-13-2010, 04:44 PM
The motor was built in florida by a company called Waterthunder proformance, they specalize in LS motors for airboat use. Though they have built engines for drag cars, jet, boats, drag airboats, and airboats. I'm currently in Iraq and I've yet to lay my eyes on the motor and I wasn't involed to much in the build up of it. Dave has done tones of R&D on his custom cam grinds from carbed and EFI engine and I don't think he'll be giving out the specs. The heads are L92.

You can check out his website www.waterthunder.com (www.waterthunder.com) or even give him a call, but he's an engine builder and all the R&D he has done puts food on his table, I doubt he'll give any info up at all unless your considering buying a motor from him.

you can also see more pictures of the engine/boat build on my site, www.bullshithill.org

I just noticed that they was core plugs in the heads so they may be catherderal ports. Not bad or good just an observation. Awsome looking engine.

I assume that you are over ther in the service so even though I am from Canada I would like to say thanks for your service!!

dmracing
12-13-2010, 04:46 PM
I just noticed that they was core plugs in the heads so they may be catherderal ports. Not bad or good just an observation. Awsome looking engine.

I assume that you are over ther in the service so even though I am from Canada I would like to say thanks for your service!!

He says in post 13, that they are L92 heads

Oldsmobility85
12-21-2010, 06:02 AM
If he's in the service hes been saving his money since he got there that thing looks expensive. I would guess contractor. Blackwater or similar?

LS3airboat
01-28-2011, 08:19 AM
Here you go guys, I've got her all finished up and put about 30 hours on her while I was home. She runs like a bat outta hell.

http://southernairboat.com/photopost/data/500/IMG_3931.JPG
http://southernairboat.com/photopost/data/500/intake1.jpg
http://southernairboat.com/photopost/data/500/hatm8_copy.jpg
http://southernairboat.com/photopost/data/500/hill1.jpg
http://southernairboat.com/photopost/data/500/SAM_0526_copy.jpg

team39763
01-28-2011, 11:55 AM
NICE! Could you get us a sound clip or a video?

Luke_PCScarbs
01-28-2011, 11:59 PM
That thing is rediculously awesome! :D

LS3airboat
01-29-2011, 08:39 AM
NICE! Could you get us a sound clip or a video?

More pics and video can be seen on my personal site, www.bullshithill.org

forcd ind
01-29-2011, 08:50 AM
do you know if they sell the coils covers-nice build, airboat, gotta be a blast to drive

LS3airboat
01-29-2011, 09:58 AM
do you know if they sell the coils covers-nice build, airboat, gotta be a blast to drive

I imagine he'll sell you the coil covers, he stocks all kinds of parts for LS motors too. Give him a call, tell him Chance in Iraq gave you his number. His name is Dave 321-508-5316

LS3airboat
01-29-2011, 12:11 PM
http://www.youtube.com/watch?v=jQq02U0Wz1U
Link to my youtube videos.

EZZZE
02-03-2011, 12:51 PM
That is the craziest thing I've seen! Didn't even know boats could do that! LOL

team39763
02-03-2011, 02:55 PM
That looks like fun.

Luke_PCScarbs
02-03-2011, 11:00 PM
Wow....I must build one! :D

NemeSS
02-04-2011, 05:51 PM
Looks fkn awesome Ran over any gators yet? :jest:

butler
02-05-2011, 07:52 AM
That is the craziest thing I've seen! Didn't even know boats could do that! LOL
Watch the old James Bond movie live or let die, I think. It has one in there doing the land thing I believe.

LS3airboat
02-05-2011, 12:25 PM
You would be surprised. There are a ton of boats that do what I do and more. Here is a dyno run for a boat my buddy is building.
http://southernairboat.com/photopost/data/1161/Bradbury_dyno_3_.jpg
Here is one of the unlimited drag boats
http://southernairboat.com/photopost/data/508/Race_1.jpg
http://southernairboat.com/photopost/data/500/DSC_00515.JPG
The drag racing seen mostly backwoods racing. There are a few events every year with ramps and trees and eta's. If you ever get the chance to ride on a real airboat(not some lame tour airboat barge) jump on it. It's a blast!

LS3airboat
05-11-2011, 05:36 AM
Couple of new pics.
http://southernairboat.com/photopost/data/500/me9.jpg
My grandpa, dad, and me all on the lake all on our own boats
http://southernairboat.com/photopost/data/500/IMG_4167.JPG
My dog and my boat, don't have old lady, which is probably why I can afford my boat ;-)
http://southernairboat.com/photopost/data/500/DSCN1184.JPG
Loaded down, 120 qt cooler full of beer, full tank of gas and 6 people. Still climbs the hill.
http://southernairboat.com/photopost/data/500/DSC_03562.JPG

Irish350
05-11-2011, 09:32 PM
hill climb ftmfw

these are so cool