running a MW 6061 in a 3500 Lb high 9 second super stocker with no problems YET! Was recommended by MW as the MMC seemed to be a waste of money.

 

Always balance it together, it's part of the shaft...

 

I agree, mostly. However, Jerico uses splines similar to, but not identical to, Turbo 400. MW makes special yokes for Jericos, for sleeve or roller tailhousing bearings. I agree that Spicer yokes are not prone to failure, and paying another $100 for the forged 4340 yoke may seem to be overkill. The increased safety may be worth it to some people. The weights of the two types of yokes are virtually the same. By balancing I meant that ideally the yoke should be balanced with the shaft, and not added later by the buyer.

 

There yoke is only needed for roller tail housings though, it isn't needed for anything else...
If any driveline shop tells you balancing on a NEW shaft is extra....

Im telling you, run... I am a driveline shop and that is part of the job, if they want extra, they're useless

 

I got the 800 HP figure from talking with someone at MW. Call them if you want more specifics on their shafts. They also have high strength trans yokes. One is included in the price of a Masterline shaft, separate on MMC. when you figure in the value of the yoke, their masterline prices are competitive, and the assembled shaft is balanced.

 

TQ x 1st gear, x rear gear is important, along with length and along with speed/rpm thru the traps for a drag car, rpm redline for road race and oval cars.

All 3 of those are really required to figure diameter.

You can't say 3.5 is for 800hp, because it is also dependent on length and speed...

I have 3" in a car making more then 800hp, but the length is shorter then 50"

Everything is dependent on all the figures...

 

http://www.markwilliams.com/driveshafttech.aspx

their 6061 aluminum Masterline shaft is rated for 800 HP.

I looked everywhere on their website and i couldn't find any reference to HP limits. Where did you find that?

Correct me if i am wrong, but the critical speed is one of the most important things when it comes do driveshafts. Isn't it?

 

Mark Williams has 6061 and MMC:
http://www.markwilliams.com/driveshafts.aspx

according to their critical speed chart, you are fine with 3.5"
http://www.markwilliams.com/driveshafttech.aspx

their 6061 aluminum Masterline shaft is rated for 800 HP.

 

Couldn't get MMC from Dynotech last time I tried to order...That is what I have in my personal car though .

 

I use Al in everything i can.

 

Would you recommend an aluminum shaft or a chromoly shaft for an application such as mine.

I know that the aluminum shaft is not as strong as a chromoly shaft, but for my power level would it be something of concern?

Thank you for the quick reply

Adrian

 

3.5 would be fine . As for the 1st part of the question the mmc vs al 6061, mmc is alum, the part there using to make the mmc is confusing...
See mmc can be a coating (which is what i believe it is), or another add during the metal mix....
I haven't seen anything thru out mmc when machining it or welding it or cutting it, so i believe it is just a coating to prevent the oxidation process which is a normal Al ability.