Lunati 4.185" crank
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From: College Station, TX
Lunati 4.185" crank 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?
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Originally Posted by JarrettL
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.
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From: College Station, TX
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.
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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
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
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
Bret
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From: Fort Collins, CO
Originally Posted by 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.
BIG Bore.
LITTLE Stroke.
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
Bret
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From: Fort Collins, CO
Originally Posted by SStrokerAce
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
Bret
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
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
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?