Guys, I am rebuilding my 04 ls6, and because its supercharged (6.5psi) the engine builder wants me to lower the compression ratio from whatever it is 10:1 to like 8.5:1. Has anyone used one of this stroker kits with a s/c setup, and what experience have you had?

http://cgi.ebay.com/ebaymotors/Eagle...spagenameZWDVW

What benefits should I see by doing this, the car currently is rated at around 600bhp and I am not sure what the torque is thow.....

Thanks

Dustin

 

For cent. superchargers on a stock cubed LS6 I would build the motor for 9:5 to 1 compression and not much lower (nothing under 9 unless your going with turbos and huge boost) as the car will feel sluggish off the boost with normal driving and will have weaker midrange numbers on the boost.

Although forged and much better than stock pistons, those -2c JE pistons in that package ebay deal are made for N/A applications and is not made specifically for f/i. Therefore, myself I would stay away from it and would go with a Wiseco or Diamond specific boost piston.

I am having a forged 9:5 to 1 compression, LS6 built 346/7 cubes, that is almost complete using blower specific Wiseco -11 cc pistons and Callies Comp Star Rods, comp blower cam, ported TEA LS6 heads and stock crank. You don't have to stroke your motor to get 750+rwhp out of a forged stock cubed LS6 blower motor but if you plan on making those horespower levels with a cent. supercharger be prepared to spend the $ (and they are not cheap) for an entire new fuel system and 8 rib pulley setup!

Good luck whatever route you end up going! I would recommend a stock cubed FORGED blower motor using top forged compenents (except for a stock crank which is REALLY STRONG) and turn up the boost to around 14 lbs, with a nice blower cam and heads and make 750rwhp (give or take a few ponies).

 

Thanks alot for your input....I will make sure we dont go below 9.5:1 ratio then and I will disregard the kit I was looking at. Sounds like I should get just get some good pistons and leave the stroke and such alone? Do you know what the stock rods can hold hp wise? And one more thing, I chunked a ring land, and cracked the cylinder liner, what could cause the line to crack, and will the others likely do the same?



Dustin

 

DUSTIN,

I am not sure what caused your stocker to let go but yes, reusing your stock crank after it is cleaned up and polished and staying with stock cubes will make all the power you will be able to use but I would defnitely go with forged RODS for your new motor as it does not make a lost of sense to go into the motor for boost and leave the stock rods in.

Put in a nice blower cam also like the one that ECS offers and wiseco makes an blower specific -11 cc piston and Diamond makes a -8.6 blower piston (booth great pistons for your application). You will have to then figure out what size combustion chambers to run on your heads (and gasket size) to give you a desired 9:4 to 9:5 to 1 compression.

 

that kit says..so I bet that piston and kit is designed for NA motors not boost. You need a piston built for boost and around 9.5/1 compression...

I used the Diamond pistons in my build...

 

The picture shows I-beam rods. In 2 descriptions, it says H-beam rods, and in 1 description, it says I-beam rods.. What EXACTLY do you get?

 

It's from detonation. I bet the piston skirt was galded too. Right? Have your crank checked for straightness and size and just reuse it, unless you are looking for more cubes. Get some new forged rods. You don't need to get a $1000+ set of rods. But don't get some chineese no name brand off ebay either. I just bought a set of Compstar rods that a lot of buildrs use for $600. But I think Eagles are even cheaper. Sine you need a block, A new LS2 is cheaper than a new LS6/Ls1 block. Of course you will have to buy some extra parts to use the LS2 block. And there is other alternatives for even bigger bores. The bigger the bore, the better the heads will breathe. Pistons are all about the same price, no matter what bore size you go with.
Another thing to keep in the back of your mind. The more cubic inches you motor is, the less boost you have to make to make x amount of HP. Less boost = less chance of detonation.

 

$1,800 for a stroker just isn't justified IMO. That money could either be used as a down payment on a forged lower end or an 8 rib belt assembly upgrade.

 

The stroker kit is a Forged bottom end. It's just the wrong compression.

 

Oops. I only read the first few words of the title. Kinda like my work emails.

8.5:1 is definitely not ideal for a street machine with a blower.