Dragula

iTrader: (5)

I'm going in for a McLeod Twin Disk and B&B Cat Back. The rest of my mods are listed in my sig.

I plan on dropping the clutch from 6000 RPM at a well prepped track. The car weighs 3685 with driver.

I'd like to stick with an Aluminum DS for now.

Which DS should I go with?

Can I get away with stock LCA's for now?

EPP

iTrader: (22)

The 3.5" aluminum Driveshaft is rated at 1200 hp, and is $399.00 plus shipping. I sell it on my website. The stck one will not survive at the track for long. Bob

Dragula

iTrader: (5)

Bob, Are you going to have a GP anytime soon?

Anyone else have suggestions?

INMY01TA

iTrader: (1)

Check out the Strange DSs on Spohns site. After seeing what I did to my stock aluminum ds at the track, I'd stay away from aluminum.

EPP

iTrader: (22)

No, I won't. There currently is a national shortage on the 1350 yokes ends, and there aren't enough of them for a big run of these driveshafts. Bob

EPP

iTrader: (22)

The stock aluminum driveshaft and an aftermarket PST 3.5" aluminum driveshaft are totally different driveshafts. Different grades of aluminum can create a totally different driveshaft that can handle a lot more horsepower, plus the larger diameter 3.5" PST 1200hp driveshaft makes it much stronger. Also, steel driveshafts tend to create vibrations in our torque arm equipped cars. Bob

trigger1

iTrader: (28)

Bob,

I'm just curious as how an aluminum driveshaft can be rated for a certain amount of hp? It's my understanding that aluminum has no fatigue limit and everytime a force is acted on it it's fatigue limit is reduced which would eventually lead to a failure, unlike steel which will maintain it's strength as long as the fatigue limit is never crossed?

INMY01TA

iTrader: (1)

I'll keep my custom A-1 steel DS thanx. (no vibration btw)

EPP

iTrader: (22)

If that was true, the oem's would never be able to use them for liability reasons. All kinds of oem applications are using aluminum driveshafts these days. The stock F Body aluminum driveshaft will generally last the lifetime of the vehicle in stock applications. Bob

trigger1

iTrader: (28)

"Fatigue limit, also known as stress limit, is a property of ferrous iron alloys and titanium [1]. It is the level of fatigue or stress that can be repeatedly applied to and removed from a metal without ever causing it to fail no matter how many times the stress is cycled. Most metals, including structural materials such as aluminum, do not have a fatigue limit and will eventually fail even under very light loads if the load is cycled enough times."

quoted from http://en.wikipedia.org/wiki/Fatigue_Limit

I believe the OEM uses an aluminum driveshaft because of COST/production reasons and because it is easily able to withstand the forces that are applied to it such as daily driving on street tires. There are many factors that will play into the strength of an aluminum driveshaft such as grade, wallthickness, diameter, etc, but as for aluminum not having a fatigue limit that is the truth.

*For what it's worth I work in a metallurgical lab.

trigger1

iTrader: (28)

Could you please provide me with the grade and temper of your 1200hp aluminum driveshaft?

Thanks

EPP

iTrader: (22)

6061-T6 Dom tubing for the driveshaft

U Joints: 1350 Spicer Series: Manufactured with OEM tolerances and treated with our Cryogenic Process to yeild the strongest U-Joint available. Bob