I was just reading the november 2006 Car Craft and they are talking about a deck plate system that <NON SPONSOR LINK> makes that enables you to use a 4.50 crank and a 4.200 bore.... Imagine rebuilding your ls motor with this thing.... 500 CI should make plenty of torque..... unfortunately for the radix guys.... you may need 2 radix too keep up with this thing.... best part is you should be able to do this to an existing block you have.... and its a plte setup, so it will not be as expensive as a cutom block....

Imagine you guys with the twins on one of these with some good heads


heres the pdf about it design pdf

 

You still need to have the LS1/LS2 block re-sleeved to accomadate the 4.2" bore. That's not cheap or cost effective by any means when compared to an aftermarket block. Besides you're still dealing with a block that has 4.400" bore centers. That doesn't leave much meat between the cylinder walls. It is a cool design though but I'm wondering what keeps the piston from coming out of the bore at the bottom of the stroke. I would imagine you would get a lot of piston rock at the bottom. Also since you added deck height, you pushed the heads out further from each other which will require a custom intake or intake spacers, and you'll probably get clearance issues with your headers or ex. manifolds.

 

What about cooling? I didnt see any coolant journals. Oh yea and i think there is a typo. They are making max torque at 45000rpm.

 

If you saw my post when i first started here a few months ago.... i dont think about logical engines... I have done strange things to cars...... and i am just really wondering how that would react to a little dual turbo pressure

 

All the correct head-to-deck passages are there.....and this seems to be an "interesting" idea, but I'm not sure this is a streetable big-cube solution. You have to remember that you are now dealing with 4 head gaskets, throwing boost at that setup is asking for problems to me. If you read throught the tech brief you'll see that the sleeves have yeald strength of 110,000 psi.....you'll have to do some complicated mathmatics to figure out what kind of boost you'll be limited to before you screw up a sleeve too.....

 

Not to mention the FEA they did showed a max deflection of .0011" at the middle of the cylinder. I don't know about you, but that's pretty significant amount of deflection at 6500rpm at +15psi of boost. Think about what the rings are doing as they not only have to seal against the cylinder walls under all that pressure, but they have to change diameter too. You could probably get around this by running a looser ring gap, but we all know how that goes.

 

That deflection is at stock cylinder pressures.....you throw 1bar at it (14psi) and cylinder pressure rises exponentially, deflection will also increase at the same non-linear rate as the liner yields to the rediculous cylinder pressure.

 

The way I understand it, there are not 4 head gaskets, just 2 normal ones on top of the deck extensions. While it does look like just a flat plate on top of the engine block, it actually has several extended pieces that go down into the existing block deck surface to lock the new longer sleeves in place.

There was a post on ls1tech forums about the first 500 ci block going through very basic testing... if I remember right, it made upper 500's HP/TQ on a VERY mild buildup with more exotic power making parts to follow.

 

HOLY CRAP!!! It's over 700 HP NA on 93 octane now!!!
https://ls1tech.com/forums/showthrea...ight=500+cubic

 

Great...now throw +20psi at it and watch the heads and bores move around.