IDRIVEAG8GT

Ok guys, after a hard bit of research and working with some very knowledgeable people we've come to this. Forgetting a previous and rather disastrous thread, I just want advice. CNC-Motorsports is starting with a Fresh LS3 Block. From there they're doing all the usual, (Line Honing, Checking, The Boring, the Balancing of Crank, etc, etc.) They want to do an Eagle 4340 Crank, 4.00" stroke, Clevite bearings to their spec, Eagle 6.125" rods. 4340 too? And then they recommend building it with Diamond Pistons. I asked if they'd slap and they said no because of the cubes not being larger than 420, and they have some sort of special skirts on them. These Pistons also have a 13CC dish which puts me at like 10:5:1, and this engine will be boosted via Magnacharger with 10-12 LBS. And Pat speced me out a nice blower cam. I plan on going with a standard pressure/High volume pump though. Does all of this sound good to you guys? And what all can I expect so far as likely noises?

IDRIVEAG8GT

Anyone see any changes that may need to happen with this?

S10xGN

iTrader: (11)

With 10.5 compression, you'd better be running race gas or alcohol injection to get that kind of boost w/o detonation. Otherwise, sounds like a picture-perfect build!

IDRIVEAG8GT

Thanks, and my plans are only to run about 10* of timing up high on 91 octane pump, but we have an Av Gas station out here good for 103 at my elevation if we wanna get real nitty gritty. This just in though, the cam that was speed is going to drop my compression to 10:3:1

IDRIVEAG8GT

Any other suggestions and comments are welcome.

ZV8

iTrader: (2)

just use a 50/50 meth injection kit for it, its cheap and easy insurance

IDRIVEAG8GT

I have almost no knowledge of Methanol. Explain 50/50 and where do you get one? Is installation fairly simple? Thanks.

The Alchemist

iTrader: (19)

50/50 Methanol is a mixture of equal parts water and methanol injected as a mist into the intake charge to help cool the intake temperatures. When it's injected as a fine mist, it evaporates, which drops the temperatures dramatically.

TXCAMSS

iTrader: (60)

AV gas is a nice octane option, but it will kill your O2s real quick. Just a heads up in case you plan to run O2s and the AV gas.

IDRIVEAG8GT

Didn't know that. Grazie.

IDRIVEAG8GT

Ah, I realized heat may be an issue so I had already concerned low timing being a factor. Especially because the vehicle will see light towing. Cool, I'll look into this.

S10xGN

iTrader: (11)

AlkyControl is very popular over on the turbobuick board...

9sec93

iTrader: (67)

how is a cam going to change your compression?

Stang's Bane

iTrader: (22)

Surprised nobody has asked what this motor is going in.
That makes a big difference. Should be a torque monster though.

9sec93

iTrader: (67)

i would assume a G8?

IDRIVEAG8GT

Valve timing I suppose? Cam by Pat so...... Anyone have any insight on how this works? Now I'm curious.

IDRIVEAG8GT

Haha my little G8's got plenty of giggity as it is. It's going in an 07 Silvy, Hence why I said light towing

9sec93

iTrader: (67)

it doesnt. cam has nothing to do with compression.
http://en.wikipedia.org/wiki/Compression_ratio

oh nice! i was thinking light towing as in real light, like a jet ski, atv, or something like that behind the G8.

S10xGN

iTrader: (11)

It cannot change static CR, but will definitely have an effect on the dynamic CR. More overlap will lessen dynamic, sometimes to the effect of 5 points difference. I've heard of 13.0:1 static engines having as low as an 8.0:1 dynamic ratio by virtue of the overlap bleeding off compression...

Devils Mentor

iTrader: (20)

I don't understand... If this is a ground up build then why not just get an 8.5:1 piston!? An Alky/Water injection is great, but I've known a few back in my turbo days that ran their wiper fluid reservoir ( that's what most use as their container for the Alky/Water mix ) dry and POPPED a piston. I say do it right from the get and get the RIGHT piston dish. Plus Less CR = MORE BOOOOOST!!!


DM