Noisy S/C gears?
 

Does anyone know of a manufactur that makes "noisy gears" for the supercharger on the these engines? I am talking about the gears that are cut straight across instead of at an angle.

The only parts you can get aftermarket for the SC is the seals, bearings, and coupler. All other parts are proprietary and can only be purchased from Eaton or Magnusson.....and they won't sell to you. Or me. Or anyone else. :cry:

What's the idea behind this?

I thought the gears were cut straight... Are you talking about the gears or the rotors/vanes?

Yes, From what I remember seeing they are cut at an angle to make them run quiet.

Not sure about the M90, but the M62 is cut straight. dbtk2? Anyone else with a Series 2 that's been in there? Are the drive gears in the nosedrive of an M90 straight?

I could most be wrong. I am not entirely sure.

The gears in the M90 also appear to be straight.

http://www.thrashercharged.com/L67_htm/blower_tear.shtm

Its been a while since we've had the nose off the blower, but IIRC they are cut on an angle, but they don't go to a point they are flat on the end.

I have been proven wrong about the gears. I still am looking for a gear that makes a little noise. Also why is it to get more boost everyone makes smaller S/C pullies? Why not change the gear ratio in the unit itself or better yet make a bigger lower pully. That one bolts on and off with no pullers. Would that not be the same thing as a smaller upper pully? Except you would not have to risk f'ing up your nose cone or buying an expensive puller that you may only use a couple of times. Just a thought.

The gear ratio in the nosedrive is 1:1. The pulley is designed to set it up. The only purpose of the gears is to spin the rotors in sync. Changing the larger pulley will affect the other accessories off the same belt path. I'd rather change a SC pulley than a harmonic balancer/main pulley anyway.

Either one has the same end effect on the SC. It spins faster.

If I am not mistaken the lower pully drives only the S/C. Maybe both the accesory pully and S/C lower pulley are one unit, but you could still make the S/C pully bigger without affecting the other accesories. I also think that the lower pulley is only held on by bolts to the Harmonic Balancer. I don't think that the H/B would have to be removed. Some one correct me if I am wrong.

That's not true at least for the Series 1. It shares the pulleys.

I know for a fact that on my 00 there is a seperate belt for the S/C.

But doesn't it also drive either the power steering or the AC?

I have to be honest I am not completly sure, I seem to remember it only driving the S/C. I could very well be wrong.

I don't have a Series II L67 handy to peek at. Can someone else check? One belt on mine drives the SC, water pump, and AC compressor. The other drives the Alt and PS pump.

Overdriving the water pump is bad news, that's why ZZP has an underdrive (larger) pulley for that. Even at stock setup, the water pump can cavitate, cutting down efficiency. Zoomer found by underdriving and slowing down the water pump, it became more efficient (and the engine gained about 5hp if I recall).

It looks like just the SC...it wraps around a few holder pulleys but they dont look like the drive anything...

The waterpump, alternator, and steering pump are on their own belt...

-- Rogue

There is an accessory belt and the Supercharger belt. The supercharger belt has ONLY the supercharger running off of it. It has the crank pulley, 2 idler pullies, a tensioner and the supercharger. The accessory belt on the SII L67 is identical to the one on the L36, then they just add the other belt for the blower.

I would much rather change the supercharger pulley than the crank pulley. For the main reason that it is much easier to get to. Besides, once you put on a modular pulley system it takes 2 minutes to change pullies and then it is really easy.

Thankds guys. Good to know the differences in the drive systems between the 2 Series. dbtk.......you'd rather change the SC pulley? Even after all that shit a couple weeks ago? :lol: :lol:

That was an uncharacteristic freaking mess!