Mercedes-Benz M 108
| Mercedes Benz | |
|---|---|
|
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| M 108 | |
| Manufacturer: | Mercedes Benz |
| Production period: | 1965-1969 |
| Design: | Inline six-cylinder |
| Previous model: | M 180 |
| Successor: | M 114 |
The Mercedes-Benz M 108 (M108.920) is a six-cylinder gasoline engine that was produced by Daimler-Benz in Stuttgart-Untertürkheim from 1965 to 1969.
This engine is a version of the Mercedes-Benz M 180 engine, from which it differs in the length of the cylinder barrels and the stroke of 78.8 mm (M 180: 72.8 mm) and thus in its larger displacement. The M 108 was only installed in the Mercedes-Benz 250S, a model of the Mercedes-Benz W 108 manufactured between 1965 and 1969 .
General
Other engines were derived from the Mercedes-Benz M 108: On the one hand the M 129 engine as an injection model with 110 kW (150 hp), on the other hand the M 114 engine, which, however, has some differences with the same displacement and the same output.
This type of engine and the M 129 injection engine built at the same time came under criticism due to a noticeable increase in engine damage as a result of thermal problems. With this arrangement, the old design from 1951 with three cylinder pairs with unequal spacing of the bores and longer stroke, thus higher piston speeds at high speeds, proved to be technically at the end or thermally overwhelmed. The successor engine type M 130 for the models 280 S / SE was then, implementing the findings, designed with even cylinder spacing for the benefit of better cooling and quickly launched on the market. The types M 108 and M 129 were therefore only produced for a short time. These motors, properly moved, need not be unreliable per se. However, you should first warm them up carefully before high loads and then not demand maximum performance over a long period of time - a characteristic that they share with many older engine types from Alfa Romeo and Jaguar . These engines do not like heavy loads before reaching operating temperature and continuous full throttle. This could end in engine damage (piston seizure), which is expensive to repair . It is also true here that many Mercedes engines benefit from good engine oil.
In their respective model series, the 250 series are the rarest engines (sedans W 108, coupés and convertibles W 111 , roadsters W 113 ). Since, in the event of damage, the larger successor engine was very often converted (which is technically completely problem-free and is even advisable in some cases for the reasons mentioned above), original 250 series vehicles have become increasingly rare.
Technical specifications
Six cylinders in line; Cast iron engine block; Aluminum alloy cylinder head; Bore × stroke: 82 × 78.8 mm; Displacement: 2496 cm³; Single camshaft in the head; two valves per cylinder; Mixture preparation using two Zenith 35/40 INAT carburetors; Compression ratio: 9: 1; seven crankshaft main bearings; Maximum output: 96 kW (130 PS) at 5400 rpm; Torque max: 194 Nm at 4000 rpm.
literature
- Udo Bols, Mercedes-Benz Personenwagen, Eine Chronik , 2007, pp. 88–93, ISBN 978-3-86133-412-5 .
