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Thread: Mercedes Benz M104/M103

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    The Notorious B.H.G. FlatBlack's Avatar
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    Default Mercedes Benz M104/M103

    Well, since I'm interested in some new powerplant options, I figured I'd contribute to the Euro section.

    The Mercedes-Benz M104 was a straight-6 automobile engine produced from 1990 through 1997. It was a double overhead cam design with 4 valves per cylinder. It replaced the M103 and was replaced by the M112 V6 starting in 1997. The M104 continued in production under license by SsangYong Motor Company of Korea.

    3.0 L M104.98x

    This 3.0 L 24v DOHC engine replaced the 12v 3.0 L M103 engine. It was found in the W124 300E-24 models, W124 300CE-24 models, W124 300TE-24 models and R129 300SL-24 models. The 3.0 L M104 produced 217 hp(162 kW) and features KE-Jetronic fuel injection, cylinder specific ignition-timing, variable valve timing and under-piston cooling jets. It was replaced by the 2.8 L and 3.2 L M104 engines.

    2.8 L M104.94x

    After the W124 received a facelift 2 capacities replaced the 3.0 litre, a 2.8 litre lower power version and a 3.2 litre version. The 2.8 L M104 produced 197 hp(145 kW) at 5500 rpm. Max torque was 270 Nm or 199 ft/lbs at 3750 rpm. Lubrication system is pressure circulation lubrication. Amount of oil in engine is 7.5 litres and amount of coolant in engine is 9 litres. Number of valves is 2 intake and 2 exhaust with V-shaped overhead configuration. Valve operation is 2 top camshaft. Camshaft drive is duplex roller chain. Starter motor is electrical with 1.7 kW. Ignition system is ignition mapping control. The 2.8 L M104 was also used in the W202 C-Class model C280 and in the W140 S-Class model S280 (the latter was not sold in North America).

    3.2 L M104.99x

    The 3.2 L (3199 cc) version produced 220 hp (161 kW) at 5500 rpm and 310 Nm (229 ftlbf) at 3750 rpm. This engine was found in the W124 and W210 E-Class, W140 S-Class, W463 G-Class, and R129 SL-Class.

    AMG 3.4 L:

    There were 3.4 L conversions done to the 3.0 L M104.980 by AMG, prior to their formal cooperation with Daimler Benz.

    AMG developed a 3.4 L M104 that was used in the E34 and E34T AMG (W124) vehicles. Amount of oil in engine is 7.5 litres and amount of coolant in engine is 9 litres. It made 272ps at 6500rpm and used Bosch KE-Jetronic (CIS-E) injection.

    AMG 3.6 L M104.941

    There were 3.6 L conversions done to both the M103 and M104 by Brabus, among others.

    AMG developed a 3.6 L M104 that was used in the W202 C36 AMG (W202),the W124 E36 AMG (W124) and the E36 AMG (W210) vehicles.

    The AMG 3.6 M104 was rated at 276 horsepower (206 kW) at 5,750 rpm and 284 foot-pounds force (385 Nm) of torque at 4,000 rpm using the HFM engine management system.

    The boost in power was obtained by stroking the 2,8 litre M104 using the crank from the 350sd engine.



    AMG 3.6 Liter M104 in a W124 E36T AMG

    Turbo Conversions:

    Turbocharger kits were offered for both the M103 and M104 engines by Turbo Technics, Mosselman, Lotec and other tuners. These conversions typically raised engine output to between 300 and 400 horsepower (300 kW). During the 1990s UK customers were able to buy new vehicles eqipped with a Turbo Technics conversion directly from Mercedes dealer Hughes of Beaconsfield (limited run of 75 conversions).

    Retrieved from "http://en.wikipedia.org/wiki/Mercedes-Benz_M104_engine"
    Categories: Mercedes-Benz engines

    The Mercedes-Benz M103 was a straight-6 15 degrees inclination to the right; automobile engine produced from 1986 through 1993. It was a single overhead cam design with 2 valves per cylinder. The M103 was replaced by the DOHC M104 starting in 1990.

    3.0 L

    The 103.980 engine (181 in. or 2960 cm) produces 177 hp or 132 kW at 5700 rpm (with catalyst), 185 hp or 138 kW at 5700 rpm (without catalyst), and has a torque of 188 ftlbf or 255 Nm at 4400 rpm (with catalyst), 191 ftlbf or 260 Nm at 4400 rpm (without catalyst). It uses the CIS-E (Continuous Injection System - Electronic) and has a bore of 88.5 mm (3.48 in) and a stroke of 80.2 mm (3.16 in). The compression ratio is 9.2 : 1 with a redline of 6550 rpm in 1987 and 6200 rpm from 1988 on. The firing order is 1-5-3-6-2-4. Lubrication system is pressure circulation lubrication system. Amount of oil in engine is 6.0 litres and amount of coolant is 8.5 litres. Number of valves is 1 intake, 1 exhaust with V-shaped overhead configuration. Valve operation was 1 top camshaft. Camshaft drive was simple roller-type chain. Starter motor is electrical with 1.5 kW; since 01.88 was 1.7 kW. Ignition system is electronic ignition system. Recommended fuel octane for the M103 is 91 RON/MON (96 RON)(86 MON). This engine can be found in the W124 E-Class, W126 S-Class Mercedes-Benz R129, W463 G-Class and the R107.

    2.6 L

    The smaller 103.940 engine (158 in. or 2597 cm) produces 160 hp or 122 kW at 5800 rpm (with catalyst), 166 hp or 124 kW at 5800 rpm (without catalyst), and generates torque at 162 ftlbf or 220 Nm at 4600 rpm (with catalyst), 168 ftlbf or 228 Nm at 4600 rpm (without catalyst). It also used the CIS-E engine management system and had a bore of 82.9 mm (3.26 in) and a stroke of 80.2 mm (3.16 in). The only mechanical differences from the M103 3.0 L to the M103 2.6 L were the decrease in bore, smaller intake valves and a slightly different airbox. The CIS-E components between 2.6 and 3.0 variants are all shared for any given model year with the exception of the ECU making engine swaps from 2.6 to 3.0 virtually bolt-in. The Mercedes Benz 722-series automatic gearbox to which it is usually linked (5-speed manuals were available on some models but are quite rare) is calibrated to take off in second gear to reduce "creeping" and provide a smoother ride. The transmission will select 1st only if the selector is in "2" or in case of abrupt acceleration. Other attributes of this transmission include a 2-3 shift delay when the engine is cold in order to speed up catalyst warm-up. 4th gear is a 1:1 ratio meaning that cruising at about 100km/h (62mph)generates engine speeds around 3000rpm. This engine can be found in the W201 190 and W124 E-Class,and W126 S-Class.

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    The Notorious B.H.G. FlatBlack's Avatar
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    Hey Bob, did you foresee running into any issues with the oil pan? I didn't read anything on the Hybrid thread about it.

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    Bob the Builder MAG58's Avatar
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    Yes with the C class pan, but the E and S (IIRC) are notched at the front to hug the oil pump. Should fit with at most a quick bit of persuasion to the front X member.

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    The Notorious B.H.G. FlatBlack's Avatar
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    Hey Bob I made an excel sheet of all the car models and years that came with M103s or M104s if you are interested. Just trying to familiarize myself with all of the different motors.

    Scott and I are on AIM talking about tranny options.

    *edit* haha WTF??



    Why did those crazy Germans do that...

    *moar edit* Pumpish's MegaSkeet install. he was using 250cc injectors!!



    http://www.mbworld.org/forums/perfor...-your-car.html
    Last edited by FlatBlack; 12-17-2009 at 05:26 PM.

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    Bob the Builder MAG58's Avatar
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    Heh. That's their EFI mani. The center is the intake which actually splits into two separate plentums. The treat the motor like a V6 with the front 3 being one bank and the back three being the other. That part in the plastic manifold is the equalizer. Vacuum pressure from one side of the mani causes it to open in the event there is a pressure difference. It also opens under high load to effectively double the plentum size (maybe it closes, it's been forever since I've studied it) and increases breathing at that RPM.

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    Bob the Builder MAG58's Avatar
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    Here! I found a rather rare, at least I've only seen one of them in person (I own it now), M104.980 (0 signifies it's from the the very first M104 production run)...Got it and the intake mani for 100 bucks from a semi-local JY.

    Pixorz for Mat

    The intake side, you'll notice the water outlet on this is on the side of the motor in front of the #1 Intake port, not between the cams at the front of the motor like all .99's and .94's, also the ports are of completely different design with much more meat for porting (though I"m not sure it needs it)


    Luckily though, the exhaust side is the same as the newer motors...


    The front of the engine, differences being the lack of a front water exit, and you cant see it here but the far right freeze plug location is actually where an idler pulley exists, instead of the slider that came on the later engines.


    #1 Piston and rod. Nothing new here just a fully forged rod with cap screws using a thick floating wrist pin and mahle pistons, all factory fun.


    Bottom end, again nothing new, but windage tray removed, crank held in with 12mm bolts, all forged with oil squirters on pressure side of block. Oiling design is priority main with the main gallery first feeding the crank/cam, then the oil squirters, and finally the head. No oiling issues with this arrangement so thus far I'm happy with it.


    Deck area, thicker cylinder walls than the standard block but both share the 12mm bolts to hold the head on...


    Intake Manifold, came off of a CIS engine, but injectors are easily removable and sleeves are made to convert to 11 or 14mm o-ring injectors. I thought the TB was going to be integrated into the CIS and thus be useless but instead it appears to be in solid shape, with a TPS, and a rather large bore.


    From all the material I've read, the .98 was supposed to be the last hoo-rah for Mercedes and their performance I6, the .94 and .99 were designed more with emissions and a global economy in mind, and they are much easier on the environment (supposedly). F*** that. I'll take the monster, plz.
    Bob Avera
    1971 Datsun 240Z, 1963 Mini Estate, 1993 MB 190E 2.6 Sportline
    As A Mercedes Owner, I'm trying to invest in a good cane. Any suggestions should be PM'd.

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    The Notorious B.H.G. FlatBlack's Avatar
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    Love it Love it Love it....

    Did you get it out of a W124 or what?

    Details, man!! Year, model, etc. etc. I am definitely thinking that intake mani is boostable...

    And for teh newbz, CIS just means stock EFI, right?

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    Bob the Builder MAG58's Avatar
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    Came out of a 1991 (build date 11/90) Mercedes 300CE-24. That's the 2door W124 Coupe. It's also found in the 300SL R129 cars. The 300TE-24 is the lower compression variant and came in the wagons.

    Quick MB letter designation
    Letters after Number, which signifies the engine displacement of the car in deciliters, exception being the 190e, which is neither a 1.9L nor an E class.
    C= Coupe
    T= Wagon
    no letter = 4 door sedan
    L= Long Wheelbase Variant

    Letters for chassis were put after the number until 1993 when they were switched to before the number designation. Convenient as the C class came out in 1993 to replace the 190e.
    E= E class, chassis designations W120, W110, W114, W115, W123, W124, W210, W211, W212
    190E, own chassis class produced 1984-1993 to replace the little E's with the introduction of the W124, thus the Baby Benz. Found in 2.3L 8v, 2.3L 16v Cosworth, 2.6L I6, 2.5L 10v Diesel (190D), 2.5L 10V Turbo Diesel (190D) at least in this country
    S= S class, flagship model Sedan , Chassis Designations W180, W128, W111, W112, W108, W116, W126, W140, W220, W221
    C=C Class, compact Sedan, models W202, W203, W204
    SL=SL class, flagship full size 2 seat convertible, Chassis designations 300SL (not sure, gullwing car succeeding the original 190SL), W113, R107, R129, R230
    SLK= SLK, compact 2 seat convertible, Chassis designations R170, R171
    Bob Avera
    1971 Datsun 240Z, 1963 Mini Estate, 1993 MB 190E 2.6 Sportline
    As A Mercedes Owner, I'm trying to invest in a good cane. Any suggestions should be PM'd.

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    The Notorious B.H.G. FlatBlack's Avatar
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    Hey Bob, are you familiar with the JTR SBC swap? It converts a "Scarab" type mounting setup using the stock engine mounts to directly mount a SBC and uses "set back" plates to move the SBC further to the firewall.

    http://www.jagsthatrun.com/Pages/Parts_DAT200.html

    I didn't know how far back the mounts were in relation to the L28's, but I figured it might be worth looking in to. I realize I can't so any measurements myself until I have a M103/4 block of my own and a mock up chassis. :/

  10. #10
    The Notorious B.H.G. FlatBlack's Avatar
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    Daydreaming over here.

    Sexy sexy sexy:

    http://www.turbobandit.com/shop/?cat_id=96&head_id=91

    8,000 SEK = ~1,100 USD

    Intake:

    http://www.turbobandit.com/shop/?cat_id=97&head_id=91

    Fuel Rail: [I might just get Pallnet to one-off one for me]

    http://www.turbobandit.com/shop/?cat_id=66&head_id=24

    M104 specific MegaSkeet stuff:

    http://www.turbobandit.com/shop/?cat_id=64&head_id=24

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