Ok long story short, would it be bad to clone the stock pulley and make it the same diameter as the code 3 whatever that diameter is? Or is there a more optimal diameter to make it? This is for a daily driven car.

 

My recomendation would be to buy a Code 3 supercharger pulley. There are companies that offer to cut down your stock pulley, but I don't think you will gain anything over the code 3 option and the cost is nearly the same. Keep an eye out in the parts for sale section, a code 3 pulley pops up every now and then.

 

Well, I work at a machine shop and it would cost very little to clone the stock pulley having it the same diameter as the code 3. This is a professional machine shop with over 30 cnc machines, (mazak integrex, pfh mills, gildemeister lathes, etc etc). Basically I would take out my stock pulley and have them clone it but at said diameter.

 

Sounds like your good to go. Let us know how it turns out, others may be interested in the service if the price is right. If you do some searches you may find the numbers your looking for, this has been discuss on this and the mercedes sites before and is a service offered by other companies. The biggest draw back discussed is belt slip from too small of a supercharger pulley. Good luck.

 

Make sure the bearing will hold up to the increased speeds.

 

Does the code 3 come with a new bearing?

 

I'm a machinest at a nice shop and I've always wanted to make a pully out of titanium! If anybody has they specs or and has an extra pully and wants to bring it to the Kemah GTG I'll bring my calipers and micrometers and get all the measurements I need to fabricate I titanium pully of any size!

 

If I move forward with this I could give you the solid edge file so you can make a print. For a price...

 

Lance: as to your original question, yes, the Code3 pulley size is great for a daily driver. Keep in mind that there were two sizes of Code3 pullies, the original (smaller) and the mid-sized. The mid-sized was a little larger than the original so that it could be combined with an oversized crank pulley and still be within the RPM limits of the supercharger at peak RPM of the engine.

So you want the size of the original Code3. I believe the original was 65mm and the mid-size was 68mm or 70mm.

Once you install a 65mm SC pulley, and a cold air intake, you'll be a very happy man.

 

I recently bought a stock pulley and took it to a machine shop. They did some sound tests "sono-something" and determined how much metal was around the bearing. Then they took it down about 5mm. They left the grooves and he also said they "roughed it up a bit" to prevent belt slippage.

Now I need some shims because the new pully needs a bit more space to keep from rubbing the SC clutch. Any idea what size those shims are or where I can get some? After I'm done, I'll probably put it back on the dyno to check the results.

 

all of my shims and rudy's shims went to a member here who needed them and we never got any of the extra shims back. its a odd inside diameter shim. you might try hp autowerks and see if they have any.

lance1337 instead of asking for a "price" for a file you might offer it to a member who is trying to advance the aftermarket products for these cars. with so little credit on here going after the almighty buck isnt the best way to start. just sayin....


jonnyb whats the advantage of a titanium pulley over the aluminium pulleys already out there? mine is first gen c3 and i have had zero issues with it and logged a max 19 psi boost

 

Titanium is as strong or stronger than steel and about the same weight as aluminum. The Titanium pulley will by far out last the Aluminum one. I'm not sure what types of coating you can put on titanium though. For example, the Aluminum pulleys get anodized for protection and to reduce/eliminate belt slip.

 

MN_32amg,
Hrm sounds like they didn't do too well of a job if you have to use shims. Not sure what there shop tolerances are but ours is +-0.1mm on lengths,
+-0.05mm on diameters and holes, +-0.5degrees on angles. Anywho, how thick of shims do you need? Maybe take it back to the shop and have them make you some?

 

Lance, that's not a valid assumption. As I mentioned, the pulley I had machined down was not the original pulley off my car, it was a stock pulley I purchased from someone else. It would have needed a shim regardless of whether it was machined or not. Evidently not all the SC are exactly the same as the C3 pulley also came with shims to ensure a correct clearance to the SC clutch.

I may indeed have to have some made if I can't get my hands on some existing ones. I talked to HPA and they don't have any.

I think it would be fantastic if someone could once again make a pulley from scratch. There was obviously a market for them. In looking at them closely, I think the biggest challenge isn't the pulley itself, but rather the friction plate and the springs that give it some play and allow it to disengage.

 

I'm also in MN. May I ask where and how much??

edit: hey, wait I know you!

 

Yep! And someday we'll meet again! I'll be ready.

 

mn_32amg take a drive to wisconson and have rudy make my dashdaq braket!! he needs your car to make it fit!

as for making a pulley the c3 was and still is very popular. brandon who designed the c3, had issues with quality control and he closed his buisness and went to work for hp autowerks who bought the rights from him. something happened and the manufactorer who built the units no longer builds them. it happened right after the big hp autowerks sale and even then getting the pullys was tough.

 

if you think you can just turn a pulley out of titanium and bolt it up, then you really need to take a look at the original pulley....there's more to it than that....I have the shims and was to ship one out to autowerks, but didn't get the info from them as where, and to who would recieve it...as I do want it returned. I only used one shim on both cars...and could have really not used any...the pulley has to disengage so it isn't just a pulley...and the surface of the pulley that engages against the supercharger face isn't metal either....

 

hey doc as it seems you have the only spacers not on a car maybe 1 could be sent to rudy to have a few made? that way when the used c3 is passed around theres a place to grab a few spacers if needed

 

I will be seeing Rudy in the near future, and I have them in the glove box of the coupe....so, that isn't a problem...I have maybe 4 in there...