smaller sc14 pulley

[racer]

the sc14 is different to the sc12 it has a bigger boss and space restrictions limit certain points were circlips are mounted. i need a spec drawing to see how they overcame this problem. other than that its possible
without the circlips the pulley can move back and forth

[mullett]

having seen a couple apart, it's not a massive task to make up a new pulley and fit it, if that's what you're getting at?

RM.

[racer]

thats what i eventually want to do is get a prototype made to suit my sc14 commodore roughly and then make a nicer 6pk pulley with bigger clutch surface dia area so i can use the existing 125mm sc14 front part of the clutch but still using the ea clutch magnet.
i hope the magnet will be strong enough to hold together the clutch.

because i dont have a lathe i have to get my enginner mate to do it for me (but hes always busy) and if i already have i diagram it saves me alot of time and money in the end.

[mic*]

Heres the boss drawing. I have been reluctant to post it coz i cant remember exactly what we did to alleviate the initial belt shear issue. I am about 90% sure that the boss was made to this spec and there was ~1mm belt shear - the SC pulley being forward, so this was taken off face that the pulley pushes against - ie 24.5mm became 25.5mm, and 23.0mm became 24.0mm. Also the holes in the boss to mount it to the SC needed to be countersunk. Surclip groove position is only relevant if you use the EA electro clutch (read on)...

I still cant confirm this but am trying to.

Also, the EA pully is 5pk, not 6. So is the 1G crank. The boss will position the pulleys so that 3 peaks out of 5 will align. The actual bolts that mount the pulley boss are the prob. They are roughly at a 90mm diameter, centre to centre. Yet the standard pulley goes over these because the diameter of the pulley is larger. Basically if you want a small pulley and more than a 3 peak belt you need to remount the charger further back or get a custom harmonic balancer with a smaller SC pulley and forget all this.



Also, the EA elctromagnet wont hold anything... I tried it with the pulley and SC14 clutch faces bolted hard up against each other (using the slpine bolt) and the clutch kicking in as usual under load - it still slipped - easily. I ended up having another piece fabbed so that the standard SC14 clutch face could be PERFECTLY concentrically located to the EA pulley, then bolted at the perimeter. I think bolting them together could be done without the extra piece, but the piece ensures they're concentric.

I'll give you a hot tip and say dont spot weld them together, maybe the perfect tradesman could but the heat or something made mine un-concentric and is the reason i have the noisiest SC14 on the road with clapped out bearings... Running for a week with the initial belt shear wouldn have helped either

Apologies to Joe. Hope ur still interested.