Does the pulley just slip on or is it to big for the shaft of the alternator?
Waiting for it to arrive so I am ready to install the kit when it gets here and need clarification.

 

it fits on the shaft perfectly.

 

Never mind i just looked at it and noticed how it is on the inside of the pulley lol

 

Installed and I love it! No more squeal.

 

Now you just need our alternator belt tension bracket. Pulleys & Belts (86-91 RX-7)

 

^also dope and worth the money

 

That belt tension bracket fits an FC waterpump. Good to know.

 

Oooh, thanks for pointing that out! I need to upgrade to at least an 80a FC alternator anyways, maybe I should snag this while I am doing that upgrade. Already have the dual pulley though

 

Yes, we designed it specifically for the FB & FC.

 

Is the pulley aluminum or steel?

Sent from my samsung gs4 using RX7Club app

 

But using a pry bar and and measuring the tension is free lol
Nice try Banzai, I will order it some time in the future though.

It's decently heavy, so probably steel, but I could be wrong.

 

I have the Banzai alternator bracket on my 12A with an S4 water pump housing.

 

I guess ill wait till it gets to my house in 2 days and put a magnet on it. Unless you hav a minute jere that you could?
Your probably right though.

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Yeah for sure, let me find a magnet real quick.

My fridge magnet stuck to it so it is steel.

 

What are the benefits of getting a pulley kit?

 

New belts and no squeal from the ac and air pump being deleted.

 

Ok kool thx

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Started to listen closely to my engine at high rpms and noticed the belt has a small consistent squeal at high rpms, but you can barely hear it, and the outer belt runs loose compared to the inside belt. Is this normal?

 

You do not have the alternator tensioned properly, which is the reason behind our alternator bracket.

 

Well I'd be god diddly damned.

 

Note: Banzai's alt bracket won't fit your stock cast iron 85 and older waterpump perfectly. You'll see Mazda moved the alt bracket bolt location from up high on the impeller casting to a bit lower and bolted through the waterpump housing and into the front iron on the 86 and later waterpumps.

YOU NEED TO BE AWARE OF THIS! And mod the alt bracket to suit.

 

Oh and the difference in belt tensions is kinda normal. Little differences in where the belt was cut from the original "drum" of material can affect lengths slightly. Or the alt isn't perfectly aligned where the front end or nose is angled down just a tiny bit due to belt tension. You'll see it's usually the more forward belt that it looser.

One way to combat this is to let them run for a bit. Then at some point take both belts off, swap positions, and run them like that for a while. I don't recommend overtightening the 14mm pivot bolt to try to shore up the alt because this doesn't really work and you just stress the alt mounting ears and cause other kinds of problems.

 

I have an 84 will it fit that? I'll order the bracket tomorrow morning if it does and thanks for the advice.

 

We designed it to fit both the FB and FC without any modifications.

FB install,

 

Ok, as long as it fits both types of waterpumps without modification, you've got a winner!