O.N.

Wow that is going to scream.
Are you going twin turbo or single turbo it?

and like the other guy said above it wont wind up very fast being such a long stroke, hence why when thompson automotive made their 2048HP twin turbo LSX they kept the bore at 4.125 and the stroke at 3.75 so it can rev right up and get the turbos working and it was only 400ci due to having a smaller stroke.

Top end it will make awesome power but it will take its time to get there.

Denali08

Those GRP rods are good for how many runs? 20?

Phil99vette

iTrader: (11)

They should be checked every 100 runs.

Phil99vette

iTrader: (11)

There are a couple ways to design the system. Short stroke/smaller motor will make less torque which will require a looser converter to get the motor to the point where it has sufficient exhaust energy to spool the turbo, a long stroke/big motor will make more torque so you can run a tighter converter and still get into the sweet spot. The tighter converter has soo many advantages its not funny.

Our old setup was a 4" stroke and went to 8500rpms, this motor should be able to do 8000 fairly easily. It should be right around 7300-7400rpms at the 1/8 mile with 3-4% converter slippage. That will put us right around 175-179mph when its set on kill.

Phil99vette

iTrader: (11)

Yes, Canted valves

Phil99vette

iTrader: (11)

2400-2800hp.

Shawn @ VA Speed

iTrader: (3)

actually you are 180 degress off. The long stoke big inch engine will make more tq,spooling the turbo(s) quicker and making much more power down low. It will also run out of turbo quicker making for less top end. The smaller short stroke engine will take longer to spool but will run much better on the top end. This is why land speed cars run small engines and big turbos.

FWIW-while we plan on running this engine between 7500-7800- i wouldn't be afraid to take this thing to 9200 if needed. I've seen my fair share of 5"+ stroke bbc's that turn 9000 rpm

GrimReaper

iTrader: (33)

should be a killer setup! looking forward to hearing about the end results in due time!

ericg69ss

Congrats Phil and Shawn. Looking forward to seeing you guys get the car out.

The Beast

iTrader: (16)

VA Speed builds something bigger than a 427?

Can't wait to see what you guys do with the new bullet! Still running the 106 on this one? Sounds like you're building with the focus of 1/8th mile?

93formto98T/A

iTrader: (28)

Shawn built my LSX TD 463 which led to the world's first Tall Deck LSX FD RX7

Anonymous

Shawn,
FWIW - You should have stopped after "...9200 if needed."
Big Blocks are a different animal with different crank journals.
You are alleging that you are comparing apples to apples.
Even CCW there is a limit to throw in an LSx crank, Bryant or not.

You don't need to justify your engine combinations.
You know what you are doing.
People will second guess you no matter what you do.

Don't get sloppy with your responses and risk credibility.
Thanks for sharing, I admire your work.

I look forward to seeing the fruits of your labor.
Best of luck with it.

Shawn @ VA Speed

iTrader: (3)

Thanks, I'm not justifying anything-as you say I don't need to. People see long stroke engines and automatically think that the stroke is the limiting factor for rpm. When in fact pretty much every time the limiting factor is the valvetrain. The BBC was an extreme example of this-not an apples to apples comparison.

Shawn @ VA Speed

iTrader: (3)

I have built lot of big inch engines, ls and otherwise. The difference between me and some others is that i will not build a big inch engine for the sake of just being big. First it has to be dependable,so if I can't put the proper piston in it or I don't have enough piston support at bdc-i'm not doing it. Second it has to make good power. If i'm limited on the top end,there isn't any reason to put a big bottom end under it. A 450 inch engine that makes 650 flywheel hp isn't acceptable to me.

Yes,this def will be mainly an 1/8 mile deal. We have changed the turbo,out with the 106,we have some new turbo technology going in. It should be fun-we're trying out alot of new technology in this engine,so I hope it works how I have it planned

McLeod

So are you guys looking for 4.4x in the 1/8?

Wnts2Go10O

iTrader: (12)

the new tech is what has me geeking over this build

BlwnTA

iTrader: (18)

Looks good guys!!! Should be badass!

What's the ETA for hitting the track Phil?

Mark

Phil99vette

iTrader: (11)

We will see.....

Phil99vette

iTrader: (11)

Your guess is as good as any. The car is ready, needs to be rescaled with the new motor. Got a fresh set of tires out back.

LS1RedZ

iTrader: (19)

Man, thats a bad *** setup, cant wait to see some passes!