keyed pulley vs pinned
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From: Norn Iron
keyed pulley vs pinned I see double pinning as stronger.
But if the crank was already keyed and the damper was keyed. Would this be fine for a blower car ?
Or best to stick with a double pinned setup ? Basically I would prefer not to drill the new crank and have a new unpinned pulley/damper I can use that has the key slot.
But if the crank was already keyed and the damper was keyed. Would this be fine for a blower car ?
Or best to stick with a double pinned setup ? Basically I would prefer not to drill the new crank and have a new unpinned pulley/damper I can use that has the key slot.
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From: Norn Iron
I'm referring to axial pinning, basically a long round key drilled at the interface with crank/pulley along the length of the crank.
Not the radial pinning that I see some kits use which would be pretty crap.
Just to clarify.
Not the radial pinning that I see some kits use which would be pretty crap.
Just to clarify.
Thread Starter
9 Second Club
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From: Norn Iron
Thread Starter
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Or I can drill the new crank and use my old pulley that was already double pinned.
Obviously using the keyed setup would be neater and I'd prefer it if it was deemed strong enough
Pinning is good and strong, just not that nice.
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I think they're both going to be pretty strong. If you want a keyed setup but you're worried about strength, maybe you could just install a larger key. This would require you to have both the crank and crank pulley out of the car so they could be machined. Also, make sure you buy a strong key made from good material... probably a higher grade steel with a high hardness rating. I'd imagine not all keys are created equal.
I would have used a key if I would have had the foresight to have my crank keyed when it was out. With that being said, my crank pulley is pinned with a single 3/4" long x 1/4" wide steel ping. I only used one pin because... seriously... there's no way I'm going to shear that pin. Don't forget that there's still one heck of an interference fit on the crankshaft - I was reminded of that as I pressed the crank pulley on and hung off my 36" breaker bar trying to torque the crank bolt. The interference fit provides a lot of strength. The pin is icing on the cake.
I would have used a key if I would have had the foresight to have my crank keyed when it was out. With that being said, my crank pulley is pinned with a single 3/4" long x 1/4" wide steel ping. I only used one pin because... seriously... there's no way I'm going to shear that pin. Don't forget that there's still one heck of an interference fit on the crankshaft - I was reminded of that as I pressed the crank pulley on and hung off my 36" breaker bar trying to torque the crank bolt. The interference fit provides a lot of strength. The pin is icing on the cake.
Last edited by FastKat; Apr 9, 2012 at 11:20 PM.
