Pulley Differences
Thread Starter
Super Member
Joined: Jun 2002
Posts: 988
Likes: 0
From: Encino
2002 C230K
Pulley Differences
i think i might be confused on this whole pulley upgrade business. you guys are increasing the diameter of the pulley, right? so then you are changing the crank pulley, right? what about getting a smaller supercharger pulley? do you know of anybody that makes them specifically for the coupe. bc the supercharger is an Eaton i believe and i know that on Eatons, you can get smaller charger pullies to increase the boost like people do on an SSEi or GTP. any help clearing this up would be appreciated.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 2,924
Likes: 1
From: Sitting behind thing freakin desk of mine. Dreaming I was playing my Taylors, and driving my Benz. Long Live The VRAA!!!!!!
C230 Sports Coupe
without getting too technical you cant decrease the size of the SC pulley and more cause it will put too much of a bend in the belt. Plus I think the pulley is pressed on the SC as well.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 2,498
Likes: 3
From: Ashburn, VA
'19 GLC 300, '19 TM3SR+
The S/C pulley seems already as small as can be. No room to play here. If this could be done, it would have been done on SLK, C230K sedan and on the C Coupe long time ago.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,211
Likes: 2
From: Laguna Niguel, CA
Re: Pulley Differences
Originally posted by dswildfire
i think i might be confused on this whole pulley upgrade business. you guys are increasing the diameter of the pulley, right? so then you are changing the crank pulley, right? what about getting a smaller supercharger pulley? do you know of anybody that makes them specifically for the coupe. bc the supercharger is an Eaton i believe and i know that on Eatons, you can get smaller charger pullies to increase the boost like people do on an SSEi or GTP. any help clearing this up would be appreciated.
i think i might be confused on this whole pulley upgrade business. you guys are increasing the diameter of the pulley, right? so then you are changing the crank pulley, right? what about getting a smaller supercharger pulley? do you know of anybody that makes them specifically for the coupe. bc the supercharger is an Eaton i believe and i know that on Eatons, you can get smaller charger pullies to increase the boost like people do on an SSEi or GTP. any help clearing this up would be appreciated.
Actually a forum member, Benzy230 made a smaller S/C pulley for his car but him and his mechanic never decided to pursue it.The crank pulley is an easy 1 hour DIY job, Search the forum for my install instructions or e-mail me and I'll forward them to you.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,211
Likes: 2
From: Laguna Niguel, CA
Originally posted by peterrrrrr
You have to remove to whole s/c to change it's pulley. Crank pulley is a lot easier. Go with a Kleeman and save 6 pounds
You have to remove to whole s/c to change it's pulley. Crank pulley is a lot easier. Go with a Kleeman and save 6 pounds
Did I confuse everyone yet, late night humor, sorry
Trending Topics
MBWorld Fanatic!
Joined: Nov 2001
Posts: 2,498
Likes: 3
From: Ashburn, VA
'19 GLC 300, '19 TM3SR+
Originally posted by linh
Vadim,
But it been done by Dynospotracing on the Slk 230. They made the S/Culley (not crank pulley) smaller. But you lose the S/C clutch.
Vadim,
But it been done by Dynospotracing on the Slk 230. They made the S/Culley (not crank pulley) smaller. But you lose the S/C clutch.
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
Thread Starter
Super Member
Joined: Jun 2002
Posts: 988
Likes: 0
From: Encino
2002 C230K
thanx for the info guys, i really appreciate it. do any of you by chance know what the diameter of the s/c pulley is? also do u know what model Eaton is on the coupe? is it an M45 4th generation? thanx again.
Senior Member
Joined: Feb 2002
Posts: 271
Likes: 0
From: Dexter, Michigan, USA
2002 C230k
Originally posted by vadim
... I'm retracting it hereby, now that I know that there IS some room to decrease its diameter even more. I guess the reason is simplcity of installation of the crankshaft pulley vs. S/C pulley.
... I'm retracting it hereby, now that I know that there IS some room to decrease its diameter even more. I guess the reason is simplcity of installation of the crankshaft pulley vs. S/C pulley.
Just because you CAN make the pulley smaller doesn't mean you SHOULD. There is a practical limit to the size, which isn't the same as the physical limit...
Super Member
Joined: Jan 2002
Posts: 875
Likes: 1
From: Los Angeles
2002 c230k
Originally posted by Spyke
Just because you CAN make the pulley smaller doesn't mean you SHOULD. There is a practical limit to the size, which isn't the same as the physical limit...
Just because you CAN make the pulley smaller doesn't mean you SHOULD. There is a practical limit to the size, which isn't the same as the physical limit...
Super Member
Joined: Nov 2001
Posts: 557
Likes: 1
From: San Diego
99' SLK 230 & 01' CLK 430
My opinion, i would go with making the S/C pulley smaller instead of making the crank pulley bigger because you want to keep the 'harmonic balancer" on the factory pulley.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,211
Likes: 2
From: Laguna Niguel, CA
Now you're asking, why the DSR pulley, is it really better. Yes, it generates more boost than crank pulleys on the coupe and it does preserve the harmonic balancer as intended by the factory and not with a heavy ring attached to it's outer edge or made out of solid metal.
Don't get too excited, it won't fit the coupe or newer SLKs. I think the biggest obsticle for the coupe is that the pulley is pressed on. I don't think you can get it off without damaging it and it would be difficult if not impossible to go back to stock.
Don't get too excited, it won't fit the coupe or newer SLKs. I think the biggest obsticle for the coupe is that the pulley is pressed on. I don't think you can get it off without damaging it and it would be difficult if not impossible to go back to stock.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 2,498
Likes: 3
From: Ashburn, VA
'19 GLC 300, '19 TM3SR+
Originally posted by mdp c230k
Spykes right, if the s/c pulley is too small the belt goes through a really harsh angle that will put a lot of wear and strain on it.
Spykes right, if the s/c pulley is too small the belt goes through a really harsh angle that will put a lot of wear and strain on it.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,211
Likes: 2
From: Laguna Niguel, CA
OK, let's say that you are correct and a the S/C pulley I've shown above from DSR is too small at 3" and the radius is too sharp, then why do you think the belt doesn't totally explode and self destruct in your car with the 2 3/8" altenator pulley?
MBWorld Fanatic!
Joined: Nov 2001
Posts: 2,498
Likes: 3
From: Ashburn, VA
'19 GLC 300, '19 TM3SR+
Good question! There's been a lot of speculation about this, but Buellwinkle is the first to provide numeric comparison. Indeed, the alternator pulley is much smaller (the lowest in the picture), and the belt makes a full 180 degrees around it, unlike the S/C pulley (the one on the left).
Last edited by vadim; Jul 19, 2002 at 11:12 PM.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,211
Likes: 2
From: Laguna Niguel, CA
I don't want to sound like a know it all but I did spend a lot of time staring, measuring, taking pictures, just short of making love to those pulleys. If the DSR S/C pulley has been around for so long and I've heard no complaints about it on the W202 or R170 forums, then I don't expect that you would have a problem if it was feasible to install on the Coupe. Say the belt lasted half its life at 30K miles instead of 60K miles, is that so bad, they cost under $20 and take 15 minutes to replace. The problem for me was that it's pressed on, that would mean cutting it off and then you are at the point of no return. The boost potential is greater, the DSR pulley gets more boost than most crank pulleys. You need Benzy230's mechanic to open up and take pics of his creation, it's the only one I've ever heard of.
Super Member
Joined: Nov 2001
Posts: 557
Likes: 1
From: San Diego
99' SLK 230 & 01' CLK 430
I know of three people that has installed S/C pulley from Dynospotracing. Two guys from mbnz.org forum. They love it cause it come with custom GIAC chip. Dynospotracing pulley max boost is at 11.5 psi vs Kleemann max boost is at 9.5 psi. With crank pulley, you can not make it any bigger to get more boost then 9.5 psi cause it will rub the water pump pulley. That's the down side to crank pulley.
Senior Member
Joined: Mar 2002
Posts: 461
Likes: 0
From: Atlanta, GA
C230 coupe 6sp
The amount of force required to turn the supercharger at any given rpm (but especially at high rpm) is going to be quite a bit higher than what is required to turn an alternator. So comparing the 2 is not really valid. Belt slippage might be a problem, but I bet the real reason is the compexity of changing the SC pulley compared to the relative ease of changing the crank pulley.
Super Member
Joined: Nov 2001
Posts: 557
Likes: 1
From: San Diego
99' SLK 230 & 01' CLK 430
Why are you guys keep asking about belt slippage when there have not has one case of belt slippaged yet. As for installation, nothing complexity about it.Remove the S/C pulley then drill out the clutch. This procedure would be much easier on the C32 because of the S/C is on the top. On the 2000-2001 Slk, there's no S/C clutch, so nothing to drill.
Super Member
Joined: Nov 2001
Posts: 557
Likes: 1
From: San Diego
99' SLK 230 & 01' CLK 430
At some point you cross the line and belt slip occurs!
