So who's going to machine down a code 3? I wonder if it has the same bearing grove or if it's solid.

Les

 

Well, I would have to think the Code 3 was copied from the original...I think you are all wishful thinking here...just not enough material to be messing with...not worth the risk...

 

this should help everyone see what they are dealing with when machining the oem
http://i765.photobucket.com/albums/x...osssection.jpg

 

Thanks for explaining the inner groove!

That's an awesome cross-section pic. It really tells the story. I wish it was labeled with dimensions though.

 

I can't see anyone sacrificing a code3 for machining. That would be stupid as you cant buy a replacement. The C3 doesn't have that inner grove... Once again, why is NW or EC not building these??? Maybe I should send mine to my pop (a tool & die machinist) to mic and produce...

 

heres a rough estimate tom
http://img147.imageshack.us/img147/6...ataametmc5.jpg

alan e/c has made a c3 type pulley. its in testing phase for now. no word when they feel its ready for production. im sure jake will post it here when its ready. he knows the biggest market is the xfires for the s/c pully!

 

DYNO made some good comments over on the MB forums. I think this cross-section was of the SC Pulley from a CLS55 AMG. Certainly the measurements below aren't that of a C32. There must be some similarity though.

[quote=dyno;3037240] took a rough measurement of my pulley:



seems total thick is about 8.5mm, ONLY !

- the groove is about 3.5+ deep
- that elastomere inside is maybe 1.5-2mm

..remains only 3-3.5 total . You can save about 1mm making the groove less deep, with a more flat edge on the bottom.
so, you have total 4-4.5 ... and I would leave at least 2,5mm

therefore, down 2mm max (after making the groove 1mm less deep).. and you get a 91-4= 87mm pulley that is a 4.6% gearing increase.

TOM2112 had the following measurements of his C32 Stock SC Pulley:

"I measured the inside diameter of the pulley to be 2.04 inches (51.8 mm) and the outside diameter of the pulley to be 2.92 inches (74.2 mm) and the depth of the belt grooves to be 0.14 inches (3.6 mm). So that means you've got 7.6 mm between the inside wall of the pulley and the bottom of the groves. If you machine that down to a 65 mm pulley, that takes 4.6 mm off each side, leaving 3.0 mm of material between the bottom of the grooves and the inside wall of the pulley".

SO, I AM GOING TO GO DOWN TO 69MM ON THE C32 SC PULLEY AND SEE WHAT HAPPENS. I AM AWARE OF THE UPCOMING EUROCHARGED PERFORMANCE PULLEY, BUT NOT WAITING FOR IT. I WILL PLAY WITH THE STOCK FIRST.

 

our final production unit should be done in 2 weeks. We will be testing that on a car in tx and taking orders in approx 3 weeks

 

This is great news!

 

Got the msg on mail just an hour ago. I am over the moon and waiting for results and order button with excitement.

 

Hey Jake, what size is yours? 68mm, 65mm, less?

 

we are still playing with ideas, but looking like 65mm

 

It would be good if you could make a 62m give the Code 3 guys a chance to upgrade.

John

 

I knew you guys were working on it. Glad you have finally officially annouced it...lol.... Good luck, as until I have problems, mine are just fine for now....but, glad to know I may have a replacement when needed.

 

jake wont build a 62 mm pulley cause he doesnt want the s/c v6's whoppin the hell out of the e55 he has!!

 

HOLD ON! THE NUMBERS BELOW MAY BE TOTALLY WRONG! THEY ARE BASED OFF A STOCK CRANK PULLEY BEING 150mm. IT MAY BE 155mm!

I need to find out for sure. ANYONE HAVE ONE LAYING AROUND THAT THEY CAN MEASURE?

Thanks to those that chimed in with the correct crank pulley measurements below. Stock Crank pulley is 154.4 mm. Info below is corrected for this.


I really doubt there's room to do a 62mm. The inside diameter of the pulley is 51.8 mm and you need 3.6 mm (on each side) for grooves. That only leaves 1.5 mm of material (on each side). That sounds pretty thin to me.

Here's some useful numbers to keep in mind:

So if Eurocharged can make a 63 mm SC pulley, that would be slightly better than the 181 crank pulley. If they made a 62 mm SC pulley, that would be slightly worse than the 185 crank pulley.

Also, I wonder what would happen if we removed the clutch system from the pulley and machined the shaft down a little. That would allow for a smaller SC pulley, but what would it do to your low RPM performance? Would the ECU freak out or what?

 

I think we'd need a whole lot more then a 62mm pulley to rival his beast

John.

 

Just for reference (especially because I know that I'm going to want to look this stuff up later):

Stock Crank Pulley is 154.4mm
Stock Supercharger Pulley is 74.2 mm

Equation to determine RPM or size of a pulley:

(Crank Pulley Diameter) times (Crank Pulley RPM) = (SC pulley diameter) times (SC pulley RPM)

orSo, if I've got a 185 crank pulley, and a stock SC pulley (74), and the engine is running at redline (6,200 rpm) the SC pulley will be spinning at:And I want to see what size SC pulley would equal a 185 crank pulley:Or, if I want to know what the crank pulley equivalent of a Code3 65mm SC pulley is:(OK, that makes me feel better. The Code3 is only 150 rpm (supercharger rpm) slower (or about 1%) than the 178 mm crank pulley setup.)

 

Yes, I think it is 155mm.

Stock Crank Pulley is 155mm
Stock Supercharger Pulley is 74mm

Based on 155mm, the crank pulley equivalent of a Code3 65mm SC pulley is:

155 * 6200 = 65 * Srpm
Srpm = 14,785

Cd * 6200 = 74 * 14785
Cd = 176.5 mm

----------------------------------------------------------------------------------

Based on 155mm, the crank pulley equivalent of a 62mm SC pulley is:

155 * 6200 = 62 * Srpm
Srpm = 15,500

Cd * 6200 = 74 * 15500
Cd = 185.0mm

Therefore, using the same calculation logic:

A 60mm SC pulley is equivalent to 191.2mm crank
A 61mm SC pulley is equivalent to 188.0mm crank
A 62mm SC pulley is equivalent to 185.0mm crank
A 63mm SC pulley is equivalent to 182.1mm crank
A 64mm SC pulley is equivalent to 179.2mm crank
A 65mm SC pulley is equivalent to 176.5mm crank

A 74mm SC pulley is equivalent to 155.0mm crank

----------------------------------------------------------------------------------

I hope I got that right!

 

James if your calcs are right then it would be awesome if EuroCharged made a 63mm pulley I think that would be just perfect.

John.