Harmonic Balancer
Thanks,
Thanks,
And yours should be either pinned or keyed if it's driving a blower. Do not rely on the interference fit only.
The PB pulley I am using has 6 x 3/8" UNF bolt holes. These are on approx 81mm PCD ( 3.2" )
From this you can approximate the centre hole if this is used for location. I'm guessing at around 2.7", but can measure if required.
I dual pinned mine. Ignore the trigger wheel mounted on the rear. Ive done this for my ecu. It does not come with that installed.

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Everyone says you have to use and ATI balancer but it looks like Powerbond will also work and I'm betting other brands will as well. This is good to know to have other options, as it would be nice to get an under driven balancer while spending the money.
ATI told me the bolt circle is 3.2" and also been told from someone that the sdce bracket (works with ati) is 2.75" from bolt to bolt. Stevieturbo confirmed his powerbond also has the same measurements for bolt spacing.
Having 6 bolts also has to be better than only 3. And it's a plain and simple steel design.
I would have no interest in an underdrive pulley, and really cannot see the point of them unless you are turning very high rpm's or running high rpm's for extended periods.
For a road or drag car, underdrive is a total waste of money IMO.
The ATI seems to have a flush face where any extra pulleys might bolt to ?
Obviously my power bond centre is recessed. And there is a large spacer before the blower pulley can be bolted.
No big deal. You just make a spacer to mount your blower pulley where you need it.

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If the original poster is running a vortech kit with I assume vortech's pulley, and it fits an ATI balancer, then i would thing they would all be interchangeable. Like you said might have to fab something up to get the spacing correct but the bolts will line up. Did your pulley require a spacer to bolt to the power bond, or how did it fit and bolt up? I am assuming you are running a vortech kit?
I wonder if i could simply buy a powerbond balancer and a 8rib crank pulley for a vortech kit? then make sure the sdce bracket is all lined up and should be good.
thanks again for the help!
You put pictures up of the balancer, but not how you are bolting the supercharger crank pulley to the balancer, or the crank pulley by itself.
Although I'm using different pulleys now. But I am still using the powerbond and the steel spacer.
It would be easy for any machine shop to make the spacer up anyway.



