Drag racing and aluminum drive-shaft

[bock]

what is the best for drag racing (running in the 12's)

Aluminum or steel DS ?

 

[Rick 91GT]

In a 12 sec car the alum is just fine...

 

[bock]

better then steel ?

 

[Rick 91GT]

Less weight = more HP.

 

[bock]

feelable hp ?

 

[HISSIN50]

one thing to remember is that though the alum DS is lighter, it has a shifted Moment (greater radius).

That said, and I am sure Rick knows and can share , Paul (KC) reported something along the lines of a couple tenths IIRC, from alum alone. Of course the state of mods/tune has a bit to do with what one can see.

 

[352Ford2]

one thing to remember is that though the alum DS is lighter, it has a shifted Moment (greater radius).

yes and when ever you want to rotate something you want all the mass concentrated in the center. The only problem with that and a driveshaft is hoop stress, given everything else equal (wall thickness, material, etc) a larger dia tube is stonger than a smaller dia tube. and that leads us to the larger dia tube that sucks up more power