JarrettL

iTrader: (1)

Does anyone know where this crank can be purchased? So far I think MTI is the only company that uses it which they do with their 455 HO GTO but does anyone know where else to buy it or if it has to be special ordered?

PREDATOR-Z

Direct from LUNATIC

Beast96Z

iTrader: (21)

I saw it on 1320 performances website.

strokedls1

iTrader: (1)

I buy all my lunati parts straight from them. They have been nice people to deal with from my experience. You may be able to get a better price from one of their vendors.

DONAIMIAN

iTrader: (18)

MTI gives really good prices on hotchkiss and lunati stuff. Give david a call overthere, im sure hell take good care of you.

JarrettL

iTrader: (1)

I just e-mailed MTI and they can't sell the crank alone but they're going to get back to me on a shortblock price.

snketr

iTrader: (3)

Call Callies, they'll make any crank you want on their next run. I called them a year or so ago and that's what I was told.

Beast96Z

iTrader: (21)

In that case, just call Lunati. MTI prabablly only has it in a stroker kit.

JarrettL

iTrader: (1)

I didn't even mention it earlier but the closest thing MTI could sell me is an assembled 455 shortblock. that's probably way too much money but they're going to quote me anyways.

DavidNJ

Just to note, any of the crank builders will make your crank to your specs. Stroke, journal sizes, bob weight, clearances. And you can order stuff with things like a no-hole balance.

Callies, Crower, Bryant, Kings, HTC and now Oliver are a few of the companies that can do it. I run a Crower in my race car, however I have always been intrigued by Callies.

David

SStrokerAce

iTrader: (2)

You could always get a Eagle 4.100" and have it offset ground to 4.185" and run a 2.00" rod journal and get the same results.... I have a feeling that's part of what MTI had to do to get that many cubes in there.

Bret

Ben R

I wonder if that's a 4.125" stroke crankshaft that has been offset-ground to 4.185"?

Full-Force

iTrader: (11)

All this talk of these long stroke crankshafts make me nervous. This is speeding the piston up faster and faster the longer they get.

Ben R

What is wrong with that?

Ben R

So what do you do when you can't get the bore any bigger? Sacrafice cubic inches cause you don't want too big of a stroke?

GueSS Who

All I know is that is a awesome amount of stoke. The other way around would be better IMO

BIG Bore.
LITTLE Stroke.

SStrokerAce

iTrader: (2)

Piston speed limits the max RPM of the motor. The only way to increase the piston speed is by using lighter and stronger parts. Piston speed isin't really your killer it's the Piston G's that are the killer, but the faster the piston speed the more piston G's you have.

Bret

Ben R

While this is true, it doesn't really apply to hydraulic-roller, daily-driven LS1 cars that see 7,000 RPM max.

SStrokerAce

iTrader: (2)

Hmmm that's funny...

A 4" stroke setup will increase the piston speed 10% and Piston G's 13%, now step up to the 4.185" stroke and that's a 15% increase in speed and 20% in G's. That's pretty important IMHO, especially when you are close to 5000 ft/min piston speed on a 7000rpm 4.185" stroke motor.

That's about 7800rpm in that 408 SBC you have in your sig... 5000 ft/min is exactly 8000rpm in that motor.

Bret

Beast96Z

iTrader: (21)

This amount of stroke will be fine if you have the proper bore to go along with it. In no way would I use it in a stock sleeve configuration, but if you step the bore up to 4.125 plus, I don't see a problem. Hell, I've seen 4.250" LS-1 cranks, but I wouldn't use one with the avalible bores of the LS-1 sleeves. I also looked into the off set ground Eagle 4.100, but was told the heat treat of the crank would be ruined. I also wonder how much the off set grinding would cost. By the time you grind the journals, clean it up, and then re-heat treat, would it be cheaper/easier just to buy the Lunati?