latemodel21

AMG55 Scattershield for Supercharger pulley

As everyone has likely seen in https://mbworld.org/forums/w211-amg/...ed-my-car.html Urbamworm posted pics of the serious damage that his Supercharger pulley did to some vital surrounding components when it came apart recently. Many chimed in with first-hand and second-hand stories of similar failures on E55s and other AMG55s. I, myself, had the OEM pulley come apart similarly (though I caught it before it went catastrophic).

While opinions vary as to the core cause (aftermarket part quality keeps coming up), the bottom line is that some are failing. I suspect the actual failure is a direct result of increased load. I am told, the 55 superchager uses north of 50 hp to compress air ... spin it faster and, more to the point, increase the load thru the creation of higher boost and the load may approach and/or eclipse 75 HP ... that is a lot of work for 3 little straps (the "dog bones") that are only .045" thick less than a 1/2" wide and secured with a 5mm rivet! While the problem seems to be more common for those using smaller SC pulleys, in my case it was on an OEM SC pulley that was loaded slightly more by a 168mm Crank Pulley. So, while I rebuilt my SC pulley with thicker dog bones (.050" thick), I still wanted more protection.

And, while inspecting your pulley periodically (specifically, the dog bones where they are secured to the pressure plate and taking it out of service at the first sign of a crack) will likely save you from a big repair bill.... I have always sought to improve the safety of my cars, be it on the street or on the track (I could tell ya about the time I did a cartwheel down the front straight at chowchilla speedway ... fixed the car under yellow ... and then came all the way from 19th to 5th before the race ended ... that was a safe car design that I was proud to drive : )

In any case, having already made a scattershield solution for the V6 AMG (info and pics here https://mbworld.org/forums/w211-amg/...ml#post6302678), I was already thinking of creating a solution for my SL55 ... when I was asked by some on the forum to make some extras (as I did in the case of the V6 scattershield)...

So, I finished the prototype this morning and wanted to share a few pics. As the viability of making extras at a great price is directly related to how many extras I have the need for and make (economy of scale), I thought it useful to make it known that this will be available and invite anyone to contact me if they have questions or interest.


While I have designed and am the sole manufacture of other products (the popular AMG55 Paddle Converter Module, the R170 Paddle integration kit, V6 AMG Belt Wrap Kit, V6 AMG Scattershield, Porsche paddle conversions, etc) that I sell either thru forum sponsors or exclusively on other forums ... I was hoping that I would not ruffle any feathers if I sold a few of these directly.
Being that this is a Safety Item, it makes sense that it should be priced low enough that it is within the budget of anyone who feels the need to get one.

I will do a run of these out of Stainless Steel. They will be done on a regular production floor which generally translates into a 4 week lead (but the good news is they wont have any of the tool-marks, etc that you see on my proto).

I am hoping to keep the price under $100 and should have a more definite idea of the price next week.

Anyone who is interested in one feel free to send me an PM.

Cheers,
Chris

Ls1toAMG

Nice product. It would be awesome to see how well it really performed when the pulley flies apart. It will be just a matter of time till we know..

2000UZJ

I'm in. Even on a stock pulley. It's cheap insurance.

Max.H

Nice idea… But, its really sad we need to go these lengths. I have never heard of any stock cars blowing pulleys up. Sad…

Ls1toAMG

Yep. 13 years later and we can't get a smaller sc pulley that is as good as stock. The crank pulleys wobble and the sc pulley throws springs. It's hard to believe. The blue print is there. I come from the ls1 world and aftermarket parts are always better when you buy the good ones.

I know the stock pulley is thin but a stock pulley with a few mm taken off is better than any option available. It's sad

Daarthvader

Oh man if under 100$ im all in! Lol

2000UZJ

It's better to have and not need, than need it and not have it...

dllhg

I agree very sad that there isnt a solid pulley for these. Crazy really. Even more crazy is if people really end up needing a shield to protect their car from an exploding mod lol

austingtir

One thing that has never sat quite right with me about the aftermarket pulleys and is why I never went for one is the fact they seemed to be shimming them more than stock... weather this got it within the tolerance recommended by mercedes I do not know but its always been a suspect area to me.

To me one contributing factor to the oem and the aftermarket pulley failing is them likely not being set within the correct tollerance.

If you think about it as soon as the gap gets wider than stock you are flexing those springs just that little bit more every time its used.

Its just far more likely to fail if your tolerances on the gap are to big its as simple as that. Mercedes doesnt give us a tolerance on the pulley for ****s and giggles its there for a reason.

I do suspect the material used for the springs in the aftermarket ones must be inferior but either way I also suspect people are not installing them properly aswell.

sircl55amg

this is a very good idea !!!

i'm always stressed out when i use my car !!!

320 dreamer

i have known chris for yrs. everything he builds is first class and he tests them on his own cars before ever telling anyone he has something new. from paddle shifters to custom brackets for me to scatter shields quailty is #1

buy with confidence

cal1

I'm definitely interested and will be following the thread. I have the OEM pulley as well, but a 178 on the crank.

Shifter

Im in.

TheTherapist

Yep better to be safe than sorry! I've had my stock crank pulley shave off and just caught my smaller sc pulley as the springs bent but before she did any damage although it did throw a belt. Now running with a stock sc pulley and 180 crank but always nervous when going WOT especially considering the perceivable wobble. About to rebuild the motor so dont want there to be any chance of things going wrong when the 180 goes on. Put me down for one.

cal1

Just curious if others have had trouble with the OEM SC pulley? I seem to recall a few issues with springs showing cracks, but maybe got replaced prior to catastrophic failure. I am on clutch pack number two and bearing number three with about 90k on the ODO so already tend to inspect belts and pulleys frequently.

gts007

sign me up

saleen01

i like it, would be nice to have something to come down from the top to the center of the pulley so that it doesn't go anywhere if it fails

latemodel21

I don't recall having seen or heard of THIS pulley leaving its shaft (idlers, yes). The bearing can get ugly and spit out pieces, but it is unlikely that the pulley will come off the shaft. Of course, if it were a problem or a concern, the scattershield could accommodate a front guard of sorts. I'd be happy to customize one for you.

Cheers,
Chris

latemodel21

I appreciate all of the interest both here and in PMs. I hope to be able to confirm the pricing by tomorrow. In the mean-time, those who suspect they may want one should let me know so I have a clearer Idea of how many to make.

Cheers,
Chris

luisdiazelite

Im in

saleen01

Im in!
my comment was more toward preventing anything from getting damaged including hoses and even the plastic cover

E55amg/FD3S

I'm in as well but would like to make sure the engine cover will clear this piece.

TheTherapist

Ok lets start getting a list together so Chris can plan ahead...
Assuming the price is around $100 the following list should be correct so far. If I missed anyone just go ahead and add yourself.

1. E55amg/FD3S maybe
2. saleen01
3. luisdiazelite
4. gts007
5. TheTherapist
6. Shifter
7. cal1 maybe
8. sircl55amg maybe
9. Daarthvader
10. 2000UZJ
11.





_

latemodel21

Fair concern ...

I generally recommend that the top-front cover be left off so that it is easier to inspect the SC pulley for signs of eminent failure.

But, while I don't run the front cover on my car I am sure that there are many who want to (or want to be able to) .... so the scattershield has been designed to allow use of the top-front cover.

Here are a few pics. In the close-up, you should be able to see the scattershield through the open space around the emblem.

Thanks for your interest and raising the question of cover fittage.

Cheers,
Chris

latemodel21

Thanks for making the list

UPDATE:
The AMG55 Scattershields will go for $95 and I should have them available to ship in 3 weeks. Shipping is $6 for USPS priority 2-day service (in the US only). Shipping is free on 2 or more.

NO deposit or commitment is required to get this price. Just let me know you want one and I will add you to the list/hold your spot.

I will let everyone know when they become available (post some pictures of the production version, of course) and then those who want one (at that time) can buy one.

Cheers,
Chris


1. E55amg/FD3S maybe
2. saleen01 (2)
3. luisdiazelite
4. gts007
5. TheTherapist
6. Shifter
7. cal1
8. sircl55amg maybe
9. Daarthvader
10. 2000UZJ
11. bierry
12. I pagan
13. Mr. CVE ?
14. C55er
15. scoto?
16.