Wicked94Z

iTrader: (26)

Stock intake manifold... 210/212 .550/.490 on a 108.5 LSA, 105 ICL. You can use stock stock rockers on the exhaust, 1.6s on the intake. There's a drop in spring that runs ~90 bucks that will run that setup all day long. At 2500-3000 rpm you'd be around 340rwtq on a chassis dyno through a 6 speed. These are Comp lobes on this one... do a cast core and you'll be right at ~500 bucks for cam, 8 rockers, and springs.

SS RRR

iTrader: (2)

A dynograph would be fantastic. I'm curious to see what the torque curve looks like as well as why it is believed a mini ram style intake can produce more torque at lower rpm than a TPI?

Wicked94Z

iTrader: (26)

Reread my posts in this thread. i suggested an l98, but if he has an lt1 sitting there....

LSWHO

iTrader: (1)

I guarantee there's a few l98 guys that would love to top swap with an lt1 straight up.

L98 torque rules.

SS RRR

iTrader: (2)

I realize that which is why I suggested tried and true cams that complement both a TPI and mini ram style intake. Now, it would be cool if you could supply a dyno graph for what you suggested to see what the torque curve looks like. Can you do that?

quik95lt1

iTrader: (7)

OP instead of overcomplicating this just use the LT1 in its stock form..........they make a very good amount of low end torque just the way they sit with a stock cam in them.........i think it will be more than enough for what you are doing........also the truck motors make great torque as well......ive got a 98 K1500 with the 5.7 vortec in it.......its all done at 4800rpm but at 3000 its got gobbsss of torque....pulls my rig perfectly

Big Al

iTrader: (1)

I'd go with a L18

Al 95 Z28

T/ALT1

iTrader: (3)

I agree here, they make peak torque at 2000-2400 or so rpms stock and most airboats that I have worked on shoot for 5300rpm peak HP. We built 400's with small roller cams that peaked at 5400rpms. I always thought an LT1 would work great but never wanted to give up any of my LT1 parts to try. LOL

T/ALT1

iTrader: (3)

We even have an airboat with a GM performance parts 572ci BBC down here in Louisiana but a light all aluminum 454 smallblock would be the King b/c of it's lightweight combined with big power and you must run a gear reduction or u will be screwed. Later Clint

Wicked94Z

iTrader: (26)

Nope I've never built a 3000 rpm LT1, and neither has LPE, GM or anyone else. If you understood the cam specs I posted, and how I came to them, you would understand how the VEs translate into low rpm torque. It's a relatively quick intake lobe, and a nice slow exhaust lobe btw.

SS RRR

iTrader: (2)

I just figured since you were going to throw a torque figure into the mix you would have something to back it up. Don't get me wrong. I would not dare say you are wrong, however I am curious to know what the torque curve would look like early in the rpm band. Again, the reason why I suggested the 211/219 if a mini ram was to be used is because they are known for making torque as early on as 2500rpm and the curve stay relatively flat throughout the rpm band. That way, it keeps things simple and we don't have to go on over something you decided you think would work when you have nothing but an idea.

Wicked94Z

iTrader: (26)

If you think some of the best cam designers in this industry rely on 100% personal experience with an engine combination you'd be 100% wrong. They draw on a varying mix of software, experience and math. I know the engine will make that torque based on 3 similar cam-only LT1. Ironically one was a 211/219, one was a 214/224, and one is a stock cam with 1.7 rockers.

quik95lt1

iTrader: (7)

^ =

:

SS RRR

iTrader: (2)

Are you a cam designer?
They also rely on results which you have none of. You have given him theory and that's it. IMO that isn't enough to spend money and time on.

Wicked94Z

iTrader: (26)

Do I have an unlimited budget for such testing? No. Do I have experience with 7 different cams from 4 different manufacturers in 3 different CID applications with 3 different cylinder heads, including DESIGNING AND SELLING MY OWN PARTS? Yes. How's it going throwing rocks from your glass house built on a 12 second SR 395.3 foundation?

SS RRR

iTrader: (2)

Wow. I did not realize you had such credentials. I would think with all that versatile experience you could show something that proves your theory?
Again, never said you were wrong, but I would love to see something other than words. Sometimes when area under the curve is being discussed I like pretty graphs and lines.

nitrous2fast

iTrader: (2)

Hey I could draw a graph!!! Or maybe get my 10 yr old nephew ....... humm... all the pretty colors!!!

MuscleCarNut711

iTrader: (1)

If you run the 2:1 reduction wouldn't that mean you can spin 6k rpm, like a normal motor?

T/ALT1

iTrader: (3)

Nope, maximum speed on the gearboxes is 2600rpms or so so that limits engine rpms to under 5500rpms.

913MOTOR

iTrader: (1)

Yes on an airboat, the reduction box is actually a torque multiplier. Say your engine turns 5K, its going to take 2 rotations of the motor for one of the prop giving you a prop speed of 2500rpms.

Thanks for the advice, Im still looking in the deciding factor for motor, Im afraid the LT1 still might be too heavy for the hull to effectivy carry weight and not sit too low in the water. Anyone have a weight estimate on just bare motor, intake to pan with no accessories?