Mercedes-Benz M 116 / M 117
| Mercedes Benz | |
|---|---|
|
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| M 117 | |
| Manufacturer: | Mercedes Benz |
| Production period: | 1969-1991 |
| Design: | V, eight-cylinder |
| Engines: | 3.5 liters - 5.5 liters |
| Previous model: | none |
| Successor: | Mercedes-Benz M 119 |
The M 116 and M 117 are eight-cylinder - V engines from Daimler-Benz . The 1969 built and 1991 gasoline engines found in various Mercedes-Benz - upper class use -Pkw.
They were derived from the technically very similar, larger and more powerful M 100 V8 engine . There was no direct forerunner. The successor was the M 119 presented in 1989 with four-valve technology .
technology
The engines are water-cooled and have an overhead camshaft ( OHC ) per cylinder bank driven by a duplex roller chain . The valves (2 per cylinder) are operated via rocker arms and are arranged in a row that is slightly inclined towards the inlet side (inside the cylinder V). This results in wedge-shaped combustion chambers . The D-Jetronic gasoline injection system from Bosch was used until 1976 , after which the K-Jetronic was used.
The engines have a forged steel crankshaft with five bearings in a crossplane design and an angle of 90 ° between the cylinder banks. The firing order is 1-5-4-8-6-3-7-2, with cylinders numbered 1 through 4 in the right bank and 5 through 8 in the left bank. As a result, the inertial forces and moments of the first and second order are completely balanced.
The cylinder heads are made of an aluminum alloy and the engine block was initially made of gray cast iron , with displacements of 3.5 (M 116) and 4.5 liters (M 117). In 1978 the 450 SLC 5.0 of the C 107 series was offered with a variant of the M 117 with an aluminum engine block and 5 l displacement. From 1979 with the model change to the 126 series , all variants of the M 116 and M 117 were converted to the aluminum block and at the same time the displacement increased to 3.8 and 5.0 l respectively.
Daimler manufactured the aluminum engine block without cylinder liners from a hypereutectic aluminum - silicon alloy. Larger silicon crystals are formed in a matrix of fine Al and Si crystals. The matrix is removed by electrolytic treatment of the cylinder sliding surfaces, and the 0.02 to 0.05 mm large Si crystals protrude somewhat and result in a wear-resistant sliding surface for the pistons and piston rings . The lubricating film adheres well to this slightly rough surface.
As part of the “Mercedes-Benz Energy Concept”, the engines were extensively overhauled in 1981 in order to reduce fuel consumption. Among other things, the diameter of the crank pin has been reduced from 52 to 48 mm in order to reduce friction and increase compression. The M 116 was designed with a longer stroke, with unchanged displacement of 3.8 l. This results in more compact combustion chambers with a smaller surface area and improves efficiency, since the hot gas loses less heat to the combustion chamber wall. The design was changed in favor of more torque at lower engine speeds in order to support economical driving in operating points with high efficiency . In addition, there were other measures, such as exhaust gas recirculation to limit nitrogen oxide emissions, control of the idling speed, which was also reduced, and significantly longer drive ratios .
In 1985, catalytic converter technology was introduced for both engines, after a catalytic converter variant of the M 116 had already been offered (albeit with a considerably reduced output). The KE-Jetronic was used, a further development of the K-Jetronic with electronic control activation for the lambda control . The displacement of the M 116 was increased to 4.2 l at the same time, and a version of the M 117 with 5547 cm³ (sales designation "560") was added. Thus there were three displacement levels of 4.2, 5.0 and 5.5 l.
The engines were available in RÜF (catalytic converter retrofittable) and KAT versions. The 560 was also available for about a year in a 220 kW (300 PS) ECE variant, which could not be retrofitted with a catalytic converter at the factory, but could later be converted with catalytic converters from third parties (Wurm-Kat). Performance-enhanced ECE engines can be recognized by the split exhaust manifolds on each V-bank, which means that the front exhaust system has four branches instead of two branches like the other V8 engines. The sedans and coupés of the S-Class W126 equipped with this were the first vehicles to have their top speed limited to 250 km / h. They should stand up to the BMW 750i with V12 engine .
In 1987 the engines were revised again. They got knock control and the compression was increased to 10: 1, which improved performance and efficiency.
Further development of the M117 to the M117 / 9 (AMG) and the M119 (DB)
At that time the independent tuning company AMG , which initially specialized in Mercedes vehicles, installed four-valve cylinder heads developed in-house on the 5.6-liter versions at the end of the 1980s, which gave the M117 engines an output of approx. 270 kW with high compression. However, the AMG engines could not be easily installed in one of the cars produced at the time: Because of the space-consuming valve control, the sheet metal of the front bulkheads on the vehicles of the W 126 series was changed at AMG . These engines were given the identifier M 117/9, an anticipation of the four-valve successor type M 119 later produced by Daimler-Benz for the models 500 E ( W 124 ), SE, SEL ( W, V 140 ), SEC ( C 140 ) and SL ( R 129 ).
As the successor to the two-valve M 117 engines, the less sophisticated four-valve engines of the M 119 family from Daimler-Benz, with their series output of 200 to 235 kW, are considered by many experts as the best V8 engines that Daimler-Benz has ever used in passenger cars . With the successor models, Daimler-Benz moved away from four-valve technology again for gasoline engines with more than four cylinders and offered three-valve cylinder heads with double ignition with the M 113 engine and the successors for all V engines. Only in 2005 did they return to four-valve technology with the M 273 .
Worth knowing, disadvantages
In parallel to the European or normal versions of the engines for super fuel, lower compression versions were produced for the USA for normal fuel there. Reasons: Obligatory catalytic converters (California environmental legislation) with the need to run the engines with unleaded fuel, on the other hand, at the time, there was a lack of environmentally compatible tetraethyl lead substitutes in the fuel for high compression. As a result, these US V8 engines perform considerably less; An example is the 4.5-liter engine of the W 108 / W 109 series (models 280 SE / SEL 4.5, 300 SEL 4.5), which only produced 143 kW compared to 147 kW of the smaller 3.5-liter Motors of the Europe vehicles. In contrast to the previous US versions of the M 116/117, the engine of the 560 SEL / SEC / SL in the US version is no longer compressed and has a compression ratio of 9: 1 170 kW (231 hp) with Cat. The same engine was also used in the European vehicles, but here it developed 178 kW (242 hp) with a regulated catalytic converter (200 kW / 272 hp without catalytic converter) due to a modified exhaust system. In the ECE version, the Mercedes 560 has an output of 220 kW / 300 PS.
In the autumn of 1987, knock control was introduced for all M 116/ 117s and the compression increased from 9: 1 to 10: 1, which also resulted in an increase in performance of around 10%. Only in the R 107 model (420 SL, 500 SL, 560 SL) was the less compressed unit used until the end of production of the 107 series in 1989. The US engines with lower compression, which were produced up to 1985 due to the fact that fuels over 91 RON were hardly available in the USA, can only be converted to the European standard with extreme effort: New cylinder heads with peripheral parts and new pistons are required. These engines for the USA use almost the same amount of fuel; their speed level is also approximately the same, so that they are also not more durable. The only difference is the performance disadvantage.
The eight-cylinder engines of the more recent versions often attracted attention because of the poor choice of materials and suppliers, because camshafts, hydraulic valve lifters and rocker arms tended to be damaged (“ pitting ”) early on . Newer, better camshafts for replacement are marked - a feature to look out for on low-mileage vehicles. Vehicles with more than 150,000 kilometers have very often already fitted new shafts after damage. In addition, the ignition control units of the versions from 1987 to 1991 are prone to drying out thermal paste on the heat sinks of the power semiconductors , which leads to their failure and thus very expensive replacement requirements - a mistake that can be avoided by replacing the paste as a precaution and inexpensive.
Experience has shown that it is hardly possible to run these engines below 12 liters consumption; strong versions, moved quickly, can use up 20 liters. A consumption of 15 to 16 liters is to be regarded as normal. That is why many vehicle owners install LPG ( liquid gas ) systems in their cars . However, these conversions can cause problems with the acceptance during the technical test for the issuance of H license plates , since this conversion must have been carried out “contemporary” according to the new legal situation - with technology that was available a maximum of ten years after the initial registration. Vehicles that are already equipped with a Venturi LPG system and also have the H license plate are grandfathered. Vehicles with a more modern, sequentially injecting LPG system cannot get an H license plate under German law.
Data and vehicle models
M 116
| construction time | execution | Bore / stroke [mm] |
Displacement [cm³] |
compression | Power [kW] at speed [1 / min] |
Torque [Nm] at speed [1 / min] |
|---|---|---|---|---|---|---|
| 11 / 69-09 / 72 | D-Jetronic | 92 / 65.8 | 3499 | 9.5: 1 | 147 at 5800 | 286 at 4000 |
| 76-78 | K-Jetronic ff. | 9.0: 1 | 143 at 5500 | 285 at 4000 | ||
| 78-79 | 9.5: 1 | 151 at 5750 | 287 at 4000 | |||
| 79-81 | Alu block ff. | 92 / 71.8 | 3818 | 9.0: 1 | 160 at 5500 | 305 at 4000 |
| 81-85 | 88 / 78.9 | 3839 | 9.4: 1 | 150 at 5250 | 315 at 3250 | |
| 79-85 | KAT / USA | 8.3: 1 | 120 at 4750 | 275 at 2750 | ||
| 85-87 | RÜF | 92 / 78.9 | 4196 | 9.0: 1 | 160 at 5200 | 330 at 3750 |
| CAT | 150 at 5200 | 310 at 3600 | ||||
| 87-91 | RÜF | 10.0: 1 | 170 at 5400 | 335 at 4000 | ||
| CAT | 165 at 5400 | 325 at 4000 |
- 280 SE Coupé 3.5 ( W 111 )
- 280 SE, SEL 3.5 ( W 108 )
- 300 SEL 3.5 ( W 109 )
- 350 SE, SEL ( W 116 )
- 350 SL, SLC ( R 107 , C 107 )
- 380 SE, SEL, SEC ( W 126 )
- 380 SL, SLC (R 107, C 107)
- 420 SE, SEL, SEC (W 126)
- 420 SL (R 107)
M 117
| construction time | execution | Bore / stroke [mm] |
Displacement [cm³] |
compression | Power [kW] at speed [1 / min] |
Torque [Nm] at speed [1 / min] |
|---|---|---|---|---|---|---|
| 69-76 | D-Jetronic | 92/85 | 4520 | 8.8: 1 | 165 at 5000 | 378 at 3000 |
| 72-76 | D-Jetronic / USA | 8.0: 1 | 142 at 4750 | 325 at 3000 | ||
| 76-80 | K-Jetronic | 8.8: 1 | 160 at 5000 | 370 at 3250 | ||
| K-Jetronic / KAT / USA | 8.0: 1 | 134 at 4750 | 298 at 3000 | |||
| 05 / 78-03 / 80 | K-Jetronic / Alu-Block ff. | 97/85 | 5025 | 8.8: 1 | 177 at 5000 | 402 at 3200 |
| 79-81 | 96.5 / 85 | 4973 | 8.8: 1 | 177 at 5000 | 404 at 3200 | |
| 81-85 | 9.2: 1 | 170 at 4750 | 405 at 3000 | |||
| 85-87 | RÜF | 9.0: 1 | 180 at 4750 | 400 at 3750 | ||
| CAT | 164 at 4700 | 365 at 2500 | ||||
| 87-91 | RÜF | 10.0: 1 | 195 at 5200 | 405 at 4000 | ||
| CAT | 185 at 5200 | 390 at 3750 | ||||
| 87-89 | ECE | 96.5 / 94.8 | 5547 | 10.0: 1 | 220 at 5000 | 455 at 3750 |
| 85-89 | KAT / USA | 9.0: 1 | 170 at 5200 | 389 at 3500 | ||
| 85-87 | RÜF | 200 at 5000 | 430 at 3750 | |||
| CAT | 178 at 4800 | 390 at 3500 | ||||
| 87-91 | RÜF | 10.0: 1 | 220 at 5000 | 455 at 3750 | ||
| CAT | 205 at 5200 | 430 at 3750 |
- 280 SE, SEL 4.5 ( W 108 ) USA, 143 kW / 195 PS
- 300 SEL 4.5 ( W 109 ) USA, 143 kW / 195 PS
- 450 SE, SEL ( W 116 )
- 450 SL, SLC ( R / C 107 )
- 450 SLC 5.0 (C 107)
- 500 SE, SEL, SEC ( W / V / C 126 )
- 500 SL, SLC ( R / C 107 )
- 560 SE, SEL, SEC ( W / V / C 126 )
- 560 SL ( R 107 ) USA
- 500 GE ( Mercedes-Benz G-Class , W 463 series)
