924 Engine history

[924slemans]

Automotive journalists hurt the sales of 924's because they spread misinformation about the engine, they were clueless....

Mercedes engine in the 924

Daimler- Benz had acquired a majority share in Auto Union in 1958 and took full control in 1959.

Auto Union was formed in 1932 with its four-ring badge standing for the constituent marques of Audi, DKW, Horch and Wanderer and in the early 1950s, it was mainly associated with small cars sold under the DKW name.

In 1958 Daimler-Benz’s Chief Engineer Fritz Nalliger asked Ludwig Kraus of the “Construction Development” to develop an in-house mid-sized car, and the result was an extremely elegant FWD saloon in two or four-door guise. The initial idea was for it to be powered by a 1.5-litre “boxer” engine (no boxer engine was developed.... the car would be called the (the Mercedes W118)

Kraus was seconded to Ingolstadt to take charge of a product modernisation project, and he was appointed Technical Director in late 1963.

but the prototype would eventually gain a newly developed a 1.7-litre in-line high-compression engine the M118......
The M118 was developed earlier by Daimler-Benz as part of a military project

The engines of the F103 series were a development of Daimler-Benz for a military project that never came into being. They were dubbed the Mitteldruckmotor (medium-pressure engines) because of their unusually high BMEP (mean effective pressure, as calculated from brake torque) values, which led to a good thermodynamic efficiency.

The engines had spiral-formed intake channels that gave the fuel-air mixture a good swirl. The engine had Heron-type combustion chambers with broad squish bands, further enhancing the mixture swirl and aiding good combustion. These features made it possible to use very high compression ratios for the time. The initial engine version had a CR of 11.2 to 1 for 98 RON fuel and even the engines intended for 92 RON fuel had a CR of 9 to 1, which was a very unusually high value for the time. It was designed to run on multiple different fuels including diesel, so it is very strong....


the car was called the Mercedes W119. When it was unveiled circa 1960, it seemed logical that it would be made by Auto Union as they had extensive experience of building small cars.

Instead of building the W119 Mercedes....... the design was tweeked to make the DKW F102 was built instead...........(later rebadged as an Audi)

A nip and tuck procedure brought the car, the mercedes-w118 back in line with what an
ATTENTION: Audi was expected to look like back in the era.

The result was the 1963 DKW F102 ...later called the Audi F103...sedan, an uncluttered three-box design with thin pillars and a large greenhouse note.........(a modified mercedes W118 design).
curb weight, 910 kg / 2006 lbs

and such technological developments as the inboard front disc brakes.....but..... Under the bonnet was a 1.2-litre two-stroke unit but this was now too associated with ageing machinery built in the DDR. ......the M118 engine wasn't available then....it was used later on in the Audi F103....

In 1964 Daimler-Benz sold its subsidiary – it wanted the funds to construct a commercial vehicle plant – to Volkswagen, and the idea of a generation of compact four-stroke cars bearing the three-pointed star seemed dormant.

But two key assets were also transfered to VW: the M118 engine project and its creator, Ludwig Kraus.
Kraus remained with Auto Union and to revitalise the F102;

his solution was to longitudinally mount the 1.7-litre M118 engine from the Mercedes W119 in the bay of the DKW......DKW’s F102 now renamed the Audi F103.....

The Mercedes M118 four-cylinder four-stroke medium-pressure engine........ was installed in Audi 60, Audi 75, Audi 80 and Audi Super 90.....it was called the EA827 in the Audi 80....then in the Audi 100... EA831.....from 1968, with a displacement of 1.9 liters and 100 hp.......in the Audi 100 the M118-derived 1.9 -litre was called the EA831 ....,

Later, the EA831 with an overhead camshaft driven by a toothed belt, ended up in the Audi 80, the VW LT, the VW Golf, the AMC Gremlin, the Porsche 924..in the 924 it was called the 047...in the 924 turbo it was called the M31.... and served as the basis for many VW engines...like the famous 1.8 20vt....evolving into today's VW Audi 4 cyl engines....the EA888

Porsche 924: Porsche designed a new cylinder head.... Sump... Crank, pistons and rods. The only thing left was the cylinder block from the Mercedes M118 engine (later the Audi engine)......in the 924 it was called the 047...in the 924 turbo it was called the M31

The legendary Audi 5 cylinder engines....
VW/Audi 5 cylinder engines......The first of the 5 cylinders was based on the new in-line 4 EA827....which evolved from the M118..... . That engine was the one used throughout the Audi and Volkswagen range in the 1970s and 80s.