LSX376 crate motor, built LSX 416 Short block or LS3 converted L99???

[SSE 4 2SS]

I like to be able to tell people my car has an LS3, with a CAI and an axle back exhaust... You really have to look to see the turbo's, and the average joe has no idea what the piping from the intercooler is...

One thing I've learned through all of this is plan big early if at all... Either do it all, or settle... Like Huffer said, you will become addicted, so go for it or stop now...

Who would ever think 800 RWHP would get ho hum...

[JLE58]

Originally Posted by camslambam

So do you guys say the crank will be fine at 15psi out of a maggie?

Sure.. Jamie has the stock crank. Ive Never seen anyone break a stock crank that I can remember. A supercharger for sure puts alot more stress on it than a turbo so most people go ahead and put them in for anything around 900-1000 hp in a supercharger.

[Supercharged SS]

Originally Posted by camslambam

So do you guys say the crank will be fine at 15psi out of a maggie?

My car has been at 18 psi with a 15k mile, 3 year old crank. I don't think your car doesn't take the abuse that mine has. You will be fine.

[G200 Pilot]

Originally Posted by calculator0512

crate motor=

Question... Why are you track retired?

[G200 Pilot]

Originally Posted by SSE 4 2SS

I like to be able to tell people my car has an LS3, with a CAI and an axle back exhaust... You really have to look to see the turbo's, and the average joe has no idea what the piping from the intercooler is...

One thing I've learned through all of this is plan big early if at all... Either do it all, or settle... Like Huffer said, you will become addicted, so go for it or stop now...

Who would ever think 800 RWHP would get ho hum...

Amen! Most of us started at several lower level builds and thousands of dollars AND several incompetent shops in the process... You're better off pulling the trigger once at the high level and save months in waiting time, grief and lots of unusable parts!

[Pro Stock John]

4.000 cranks are popular, but there are some race cars out there with 3.900 stroke setups, even less stroke.

I'd think the 416 would make more power with the same blower.

[jrpxxii]

Originally Posted by G200 Pilot

Question... Why are you track retired?

He's sceeeeeered

[speedster]

Originally Posted by Fiftydriver

Why do we not see more of the middle CI engines? Why do we ususally go straight from 376 up to 416/418? I would think that a 383 or 400 would be a great combo for a bit more low end torque while being a bit more friendly with the Maggie blowers.

What other cubic inch options do we have out there in the mid size ranges.

The most common reason to jump to 416 or larger is that if you are going to replace the rotating components anyway, the price difference is negligible so why not? It is as close to 'free' HP/TQ you can get for most applications.

Not that it is any better or worse, it was just the method we chose, but for the SST we ended up going with 388 cubes. Started talking 454, then 440, 427, 416, 408 and ended up with 388. Knew we would someday be going with extreme boost levels and the simulations brought us back to a 4.125 bore x 3.62 stroke. This gives a large surface area for the boost to push against and the shorter stroke allows for fairly ridiculous rpms. For a turbo motor boost + rpm = HP.

Everyone here has great insight as to why they chose their setups. Look for someone who has done a build closest to the components you want and see how their Camaro runs. No reason to re-invent the wheel. There are some kick-ass Camaros out right now with a whole range of budgets that built them. Fast today is an understatement.

[xx_ED_xx]

^Agrees
I am building a new motor for my truck project and finally decided 4.500 bore and 4.250 stroke, the block can take 4.600 bore and 4.750 stroke but just because i can doesnt mean i will longevity etc I would rather have a big bore shorter stroke motor. Unlike what is in the truck now. 4.290 bore 4.370 stroke

[Pro Stock John]

Truck = tall deck LS or BBC?

Reasons to not increase stroke:

~Class won't allow it, or incurr major weight penalty
~Piston choices become too limited
~Issues with piston speed (Just repeating what I've heard from engine guys)

For a pump gas car I'd go more cubes and dropped compression, then can get to say 700rwhp on straight 93 vs needing to run more boost + race gas to hit he same goal with a smaller engine

[xx_ED_xx]

BBC

[old motorhead]

Don't forget that the longer the stroke, the closer the piston pin is to the ring lands (unless you use a shorter connecting rod which ushers in a whole nother breed of compromises). Pushes everything to the top. Top ring doesn't have much "meat" to work with. Less durable to my way of thinking.

If your power adder is a TVS2300, you can make just as much power with a 376 as you can with a 416. Absolutely, torque will be up with a bigger motor. Any time you make more power at lower rpm, by equation, torque goes up. Last I checked, lack of torque isn't a problem with a p/d blower. Like I mentioned earlier, if this isn't an "all out" build, less cubes = passing more fuel stops.

If my LS3 ever shoots craps, the new motor will have a 4.8L (3.27" stroke) crank. About 5.5L's. I bet I can make as much hp as a 416 if working with a TVS2300 on top. I'll pass a whole bunch of fuel stops too. If you're looking for the every last bit of power, yes, cubes rule. Life's full of compromises though. Choice...choices

[Chris-HPS]

Also dont forget that when you are building a purpose built 414 or 376 Engine for Boost you will LOWER the compression. So insteaad of your 10.8-1 stock ls3 motor you will have a 9.0-9.5-1 boost specific 376 or 414ci engine. This means if all you do is forged your LS3 with lower compression and add the same boost you will not make the same power as you did when it was stock due to the lower compression. You will have to add a smaller blower pulley or turn up the boost with the turbo to achieve the same power you had as you did with your stock motor. Same thing with the 414 Boost specific engine.


Chris

[Chris-HPS]

Originally Posted by camslambam

So do you guys say the crank will be fine at 15psi out of a maggie?

Stock cranks are good for appx. 12-1300hp. Personally I have made 1089rwhp and 9.0's @ 156mph in my streetcar on a stock crank 377ci TT.

Chris