I've got a 383/P600 and had an issue in the past with spinning a non keyed hub. So I swapped out to a keyed fluid dampener and it's been good for about 3000 miles. Ran it hard one day at the track, and again on Saturday on the street and it's sheared the keyway again, and the hub has now backed off the crank. I don't want to pull my crank/motor to do a dual keyway setup, I'm pretture sure this would have messed the crank up some. So does anyone see an issue will drilling the hub and running a setscrew?

Any input would be great.

TIA

 

I'm not sure a set screw would hold it.
The single key way is much stronger than a set screw.

The single key way with an additional set screw may give you some help but it seems like a losing battle.

I would be worried that it didn't work that it would majorly damage the crank snout and that crank removal would be the end result anyhow.

 

Was there crank damage from the stock hub spinning? If the crank was previously scarred, your new balancer can have a short lifespan. A galled crank can prevent a good press fit as well as add additional stresses to the hub causing premature failure. The key does not support all the driving stress, it only supplements the press fit of the hub. Use only a good keyway as well, hardware store keys are usually soft junk. Be sure the crank is OK before you spend more money on a new hub.

The hub may have also split. I have seen it frequently with Fluid dampers on supercharged motors.

Pinning the crank could help, but it is only a bandaid for doing it right. Your p600 is not big enough to hurt a single key unless something else is not correct.

Hope this helps.
Lonnie

 

I haven't had time to remove everything and check out the crank. When the original hub spun it marred the crank a little, but it didn't seem to affect the fit of the hub. It didn't just slide on or anything, I had to use an installer. I'll check it out a little more closely, but if the crank snout is messed up, I don't see set screws hurting it more than it already is. I just don't have the time/money to rip the motor apart and replace a crank and have it balanced, etc. Although perhaps that is what it will come down to.

 

Yeah I defintely think a set screw is a bad idea. If that spins, imagine the damage its going to cause to the crank. Id bet the crank will be ruined if that setup doesnt hold, and it probably wont. Just my 1/2 cent

 

you using two keys right? one right in front of the other?

 

yup.

Like I said I'll have to look at the crank closely this time, but if it's already beat up a little, I'll set the hub on the mill and tap it then drill a small pilot hole in the crank. I may do like three small set screws. Because if the crank is messed up anyway, it surely won't hurt to try.

 

i agree, ive spun one and ruined a crank, ended up have to replace the crank

let us know how it goes