Aluminum Driveshaft Max RPM

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Dec 6, 2007 | 03:44 PM

#21

TURBHOE

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From: Jacksonville FL.

you can buy them yeah. not sure on price i think somewhere between $400-$600.

Dec 6, 2007 | 08:14 PM

#22

Spoolin

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From: Here and sometimes there too.

Steel shafts are smaller in diameter, shorter, have a higher RPM speed and are heavier = more rolling mass. Because of their weight/mass they can only be soo long before you have to go with a 2-piece, or else it will wobble itself to pieces.
Aluminum Drive shafts are Lighter (hollow or filled with foam in the center), Longer (up to 8x inches, and much wider. They handle Torque loads better due to their girth but have a much slower RPM critical speed.

Dec 6, 2007 | 08:17 PM

#23

Spoolin

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From: Here and sometimes there too.

Quote:

Originally Posted by Yogi Bear

Keep in mind that if you accelerate through the critical speed fast enough, you get another RPM operating range (before the next harmonic) where the shaft will stabilize. At the next harmonic, the shaft will again go critical, and if held at the critical speed, will self destruct.

I've actually pushed through the critical speed before on my aluminum DS and it did in fact quit it's vibration and was smooth running. It was not smart but pretty cool to do it. I got the idea because I work on Big marine Diesel engines and they have a Critical speed usually around 28-43 RPM's that you have to push through real fast or else the engine will vibrate itself to death but after that she runs fine.