Gregory

iTrader: (4)

At what point does crankshaft weight become a concern?

I have a choice . . .

Brand A: 47lbs. @ $2550.00 with anvil shaped counter weights
Brand B: 53.5lbs. @ $1135.00 with minor counter weight work

Difference: 6.5lbs. & $1415.00
Both crankshafts are good for 1200 HP and American Made
Application: 8000 RPM Road Race and The Texas Mile


Weight of additional parts
Pistons 484g
Pin 171g
Ring Pack 19g
Groove Lock Spacer 1g
Spiral Lox 4g
TOTAL 679g

427

iTrader: (3)

I have tried something like this in the car and been unable to verify the difference in weight reduction. You would assume it should show up in lap times on a road race car as it helps free up revs both up and down. If it was mine I would save the money for other parts....

Kurt

Gregory

iTrader: (4)

Thanks!

87silverbullet

iTrader: (11)

For your intended usage I don't see having to go with a lighter crank would benefit you, especially only 6.5 lbs

HioSSilver

iTrader: (8)

For every 1lb off the crank is = to 15lbs of dead weight. 15x6.5=97.5 lb

6.5 off the the crank is actually pretty big.

Zmg00camaross

iTrader: (11)

^^ ageed. I would save up the extra.

87silverbullet

iTrader: (11)

Like Kurt just said though. In road race application you would think this would work better. He stated he couldn't see a difference.

In a drag race application, the mass is already moving and it speeds up once. Only drops in speed on shifts and that's at most time 1k rpm on the shift extenstion.

If we were talking about a weight difference of lets say 38 for the light crank and 55 for the regular crank then by all means I say go for it, but you're telling the OP to go and spend another 1400+ bucks to get a crank that is only 6.5lbs lighter? I think I will stay with the heavier one.