Adding a 10% overdrive pulley to an already pinned crank.

[fumanchu182]

When I was stock I pinned my crank using this kit: https://highhorseperformance.com/hh...or-15-current-gen-iii-hemi-supercharged-6-2l/, to prevent my crank head from looking like swiss cheese can I re-use the key hole? Has anyone encountered this before? I'm thinking I can use the kit and overlay it over the key hole and drill that and then re-insert the pin. Good idea/bad idea?

 

[16GoManGoHC2]

I just did this this weekend. Best thing is to machine the new ATI hub to accept a round key where it’s cut for a square key. I’m putting a stock size shell on for now, have a 10% OD and clearanced the AC mounting boss to clear the hub so it’s ready for quick swap between a stock size shell and the 10% OD one.

 

[fumanchu182]

I don’t have access to a drill press, would I be able to clamp the pin kit to the pulley when not installed and use that as a guide? @16GoManGoHC2

 

[16GoManGoHC2]

I don’t have access to a drill press, would I be able to clamp the pin kit to the pulley when not installed and use that as a guide? @16GoManGoHC2

I doubt it. I do this in a milling machine with a 1/4” end mill. I can do a hub for for if you want to send me one. I would need to know the projection distance of the pin on your crank snout to get it right. The jig does not drill the pin hole exactly 50% in the shaft and 50% in the hub. Easiest and quickest thing for you to do is just mount it and redrill the crank for another pin but yes your crank starts to look ugly after doing this too many times but who’s going to see it under the bolt??? I have the Towing in the ability so that’s just the way I do it I did that to my stock balancer as well notice how the pin groove goes all the way from one side to another that’s how I was able to re-mount it in the same location as it came off when I rebuilt the engine. I cut the groove all the way through the hub so it could follow the existing pin onto the snout when being pressed back on.

 

[white1]

I've been able to align the hole close enough to get lucky a couple of times.
its not too hard

 

[Speedy!]

Most do a new pin 180° from original. That's how I'd do it.

 

[Blown7]

Most do a new pin 180° from original. That's how I'd do it.

I the big blower engines I build I install two (2) keyways 180 degrees apart.
Be really cool and install three (3) 120 degrees apart. It transmits something like triple the torque rotation.

 

[Unholy707]

It’s only half a square hole, should be able the wallop a round peg in there