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1992 SL300-24, 1998 BMW 750iL
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Discussion Starter #1
Hello

Im planing to convert my R129 to run a supercharger setup, as far as im aware...the 98-2000 SLK's came with an Eaton M62 while 2000+ came with an M45 supercharger which is common with the Mini S....My car is an M104 inline 6 3L engine

My question is...some of the superchargers fit on both 4 cylinder and 6 cylinder models from a 2.3L-3.2L engines...if i ran with a supercharger from a 4 cylinder, would the efficiency decrease due a bigger displacement from what the supercharger was intended to work with?
 

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1998 Mercedes 230 SLK
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351 Posts
Yes, you will have to spin the smaller supercharger higher to achieve the same hp increase compared to the larger supercharger. Alternatively, you can look for a used M90 from a Jaguar.
 

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1992 SL300-24, 1998 BMW 750iL
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Discussion Starter #3
The thing is, where i live...the supercharger has to be OE for it to pass its registration test and be road legal...so is a M90 installed on an Mercedes cars?
 

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1998 Mercedes 230 SLK
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No, only M45 and M62 were ever used on Mercedes. On the other hand you could also look into the IHI Lysholm-type supercharger which is used on all the supercharged AMG models (SL32, SL55, S55 etc). They are more expensive but easily give you 0.8-1 bar boost.
 

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1992 SL300-24, 1998 BMW 750iL
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Discussion Starter #5
couldn't find anything on any of the ebay's regarding this type of superchargers.
From what iv gathered...the m45 is a small unit and will be out of it's efficiency range pushing high boost on a 6 cyl yet it is fitted to the following cars
98-03 Mercedes Benz 230 Roadster 2.3L 4cyl
02-03 Mercedes Benz 32 Roadster 3.2L V6
99-00 Mercedes Benz C-230 2.3L 4cyl
02 Mercedes Benz C-230 2.3L 4cyl
02 Mercedes Benz C-320 3.2L V6 All SLK
While the eaton website says that the M45 is designed for 2-3L engines with a max operating limit of 14,000rpm....ahh, the eternal dilemma
 

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1998 SLK 230
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2,647 Posts
the m45 - 1.6 to 2.2 lt engine displacement
EATON-M45

the m62 - 2.2 and 3.5 lt engine displacement
EATON-M62

the m90 - 3.5 to 4.0 lt engine displacement
EATON-M90

only benz i know of running the m62 is the older generation SLKs and some C class... all the newer ones use the m45. prob because

1) its cheaper
2) to stop people getting big gains out of them (i.e. aftermarket tunning).

no benz uses the m90, although some aftermarket kleenmann kits and HPS kits use a modified eaton m90 blower. but these are for the larger motors and v8s....

from factory some of the m45s are spinning fast, and say if you had more room to move (in the case of a m62) you would make significantly more power than the car higher in your class for less money. i.e. if you had a SLK230, no incentive to get a SLK320 etc...

thats why spining the m45 even more will have little gains its close to its limit in the new cars. they arent stupid!
 

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1992 SL300-24, 1998 BMW 750iL
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Discussion Starter #7 (Edited)
I never thought of it that way!
so i guess im looking for a
98-2000 C230
2001-2004 C320
98-2000 SLk230
2002-2004 SLK32
as all of them have the Eaton M62...correct?

also...is there such a thing as an Eaton M65?!
two different sellers have posted their superchargers as an M65 yet there is nothing on Google on M65's

Are all M62 identical in shape or is there differences between an M62 for Buick's, Pontiac's, Oldsmobile's and Mercedes?
 

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1998 Mercedes 230 SLK
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2001-2004 C32 not C320
there is no Eaton M65 so this is likely a M62.
 

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2005 Crossfire
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We haven't worked with the Eatons on Mercedes, but are very familiar with the M45 or M62 as we install these on the 1.6 L and 1.8 L MX5 Miatas. The M45 on the 1.6 will produce about 9 psi, if we overdrive it. The M45 on the 1.8 produces about 7 psi with the same diameter pulley. The M62 on the 1.8 gets around 12. I am really surprised MB would put that little 45 on a 2.3 L motor. Heck, I've had a project in the pipeline to make a cold side 62 kit that would fit a 1.6 - just can't seem to find time to finish it.

To my knowledge, the main body of the blower, whether it is a 45, 62 or a 90, is the same across different model cars. What changes is the "snout" - the front of the blower. The length of this varies to physically fit in the car in question. The other factors which change are the drive pulley - they come in all sorts of diameters and belt type. The pulley is easy to change, the snout would not as you would have to buy the correct one. Eaton/Magnusson aren't the best people to buy parts from so you would probably have to go the dealer route. Not sure if the dealer gets into blower parts or if they would just try to sell you the whole thing.
Henry
 

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1992 SL300-24, 1998 BMW 750iL
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Discussion Starter #10
Is there a way of measuring the snout of the supercharger in question?

Im sorry if im bombarding you with questions, i come from a turbo background with very little in-depth knowledge on superchargers
 

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1999 SLK 230
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937 Posts
At +100K miles my SLK's supercharger wore out, and I got a rebuilt one from Supercharger Pros. You might try contacting them, as they may have information you seek.
 

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2005 Crossfire
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Sure - its quite easy as it is simply the part of the blower at the front that has the pulley on it. Measure from the casting behind the pulley toward the main body of the blower. The first seam you come to is the front of the blower and the length of this part is the dimension that changes. The "snout" or front housing actually covers the front gears that tie the two rotor lobes together. The housing holds the front shaft, which naturally has to be long enough to fit into which ever housing you had. One of the advantages of doing it this way is that they can make one basic blower and then bolt on whichever length they need. After the blower goes where it needs to for air flow the various lengths put the pulley in position to line up with existing drive belts/pulleys at the front of the motor.

I've seen some GM cars with blowers with front snouts that were about a foot long. The snout on the 45 on our MX5's is only 4", so you can see there is a LOT of variation.
 

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1998 SLK 230
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Team DNR is right... eaton only sell the cast case & rotor pack to OEM manafactures.

the manafacture then makes their own snout and inlet and outlet pipes to suit..

any idea where you want to mount it? and where it will fit? most common place for a V6 is right in the middle of the V. but since yours is an inline 6 finding a location might be tricky...

hard part will be making a mounting plate (very soild) and aligning it to the other pulleys... and then inlet and outlet pipes (may have to be custom)... and then mounting an intercooler!
 

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Discussion Starter #14
well, i spoke to the tuning shop...it can be done, i need an M62 supercharger, stand alone ECU, bigger injectors and a custom fuel rail with a front mounted intercooler and a BMC CDA airfilter...alot of custom work!
 

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PROUD OWNER! 2002 slk32 AMG
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well, i spoke to the tuning shop...it can be done, i need an M62 supercharger, stand alone ECU, bigger injectors and a custom fuel rail with a front mounted intercooler and a BMC CDA airfilter...alot of custom work!
im not sure why your going this route. you need a s/c from a 5.5 litre sc engine. ie: sl55 e55 cl55 so on. then you need to tune it to the ecu in the car. not hard on the older models. if you search mbworld theres already somebody running a s/c on a 5.5 litre sl500
 

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Discussion Starter #16
ahh...but my car is an R129 SL300-24...inline 6, 3L M104 engine, not to mention my car runs old school ECU....so regardless of the amount of air entering the cylinders, it will still pump the same amount of petrol while the standalone ECU will change according to the situation not to mention i can run 2 different maps
 

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PROUD OWNER! 2002 slk32 AMG
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ahh...but my car is an R129 SL300-24...inline 6, 3L M104 engine, not to mention my car runs old school ECU....so regardless of the amount of air entering the cylinders, it will still pump the same amount of petrol while the standalone ECU will change according to the situation not to mention i can run 2 different maps
ok makes more sense. doubt the 3.2 v6 or the 5.5 v8 blower will work in your application as they sit in the v of the engine between the heads and the intercooler is located underneath
 

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1999 SLK 230
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ahh...but my car is an R129 SL300-24...inline 6, 3L M104 engine, not to mention my car runs old school ECU....so regardless of the amount of air entering the cylinders, it will still pump the same amount of petrol while the standalone ECU will change according to the situation not to mention i can run 2 different maps
There are other ways to do this, although perhaps a bit more crude. I installed a supercharger on my Miata years ago. The kit included an auxiliary fuel pressure regulator that increased fuel pressure under boost, so no ECU change was needed. A replacement fuel pump that could supply higher pressure was also part of the mod. Something to consider of cost is a major factor.
 

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There are other ways to do this, although perhaps a bit more crude. I installed a supercharger on my Miata years ago. The kit included an auxiliary fuel pressure regulator that increased fuel pressure under boost, so no ECU change was needed. A replacement fuel pump that could supply higher pressure was also part of the mod. Something to consider of cost is a major factor.

it seems the biggest issue the op has is he has to use a m/b blower due to the requirements of his country. that limits him considerably

techtune is the member on mbworld who has a blown r129 his is a 2002 sl500 . you might try contacting him to see what info he can share with you
 

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Discussion Starter #20
ok makes more sense. doubt the 3.2 v6 or the 5.5 v8 blower will work in your application as they sit in the v of the engine between the heads and the intercooler is located underneath
Thats why im aiming at the 98-2000 SLK230...its an inline 4 as for the intercooler...plenty of space upfront due to a 2010 R230 SL63 front bumper
 
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