Mercedes Benz F700 concept car Mercedes cocktail mix Telegraph

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Mercedes-Benz F700

Mercedes- Benz F700 car: Mercedes cocktail mix

BST 03 Jul 2008

Mercedes F700 car offers the promise of limousine of power and refinement, with fuel economy. Andrew gets a drive of the technology one day might make this

Star of last autumn’s Motor show, Mercedes-Benz’s concept drew mixed for its styling, but much interest for its technology, cleverly called a portmanteau word containing the of the inventors of the diesel and the petrol

The crucial difference between the two units is that the diesel combustion through compressing its mixture, whereas the petrol which uses lower pressures, needs a spark to ignite its fuel/air combustion Engineers have contemplating the of both technologies for some now and most big car firms are working on own version of a petrol engine runs as a throttle-less diesel at periods; most notably General Motors and Mercedes. It was that got the best name,

We had a chance to drive the F700’s engine in a test mule, a V8 Mercedes S-class fitted the experimental engine. It runs on unleaded petrol and its power and figures give the first to its unusual configuration. You don’t see petrol engines with power than torque, yet is quoting 235bhp and 295lb ft of figures more often from a turbodiesel engine.

The engine is a 1.8-litre four with twin overhead with variable timing and two acting independently according to a of valves in the intake system. The is injected directly into the and the air enters the combustion chambers via of the two different-sized turbochargers and an inlet-charge There is also a swirl to induce the fuel to spread throughout the combustion charge. were several things Mercedes didn’t want to us, most notably the variable system that involves an of the crankshaft geometry to give ratios between 7:1 and 14:1. We weren’t allowed to examine the reduction system that Dr Günter Karl admitted was in effect to that of a counter-rotating shaft, but signified a different to the problem.

Key to the system are the individual cylinder sensors, which determine when the engine can operate a spark. Nominally the engine its spark-ignition system and its low-compression to start and then at low and high speeds. It’s in the middle things get interesting with a of spark-less operation at up to half openings between 1,000 and This will include autobahn use, says

Mercedes-Benz F700

In practise, the cylinder pressure determine exactly when are right and then instruct all engine electronic control to increase the compression ratio and inhibit the spark. This of the spark into the spark-less helps reduce the high-pressure associated with diesel which usually cause

The trouble is the pressure sensors are and by no means production ready, as are normally only used on research engines.

We got behind the of the S-class and drove the Diesotto, is impressively refined compared the General Motors’ somewhat equivalent experimental unit. The from spark to spark-less and back is discernable, but not unpleasant. The here is that Mercedes has fitted the car with a small hybrid system, which masks the transient points the Diesotto system might be to make a lot of noise. While the is never going to replace a big V8 for torque and power, or a V12 for refinement, it was a promising start. It also 53mpg on the EU Combined cycle and so that’s limo performance super-mini economy.

The system is still work in but parts of it are to be introduced in stages, direct-injection petrol engines on from next year and petrol units from

The whole thing? That take time, says We might not even turbo the first versions of the system. now though, we need to do more work on the variable compression and the pressure sensors and we also to work on cost optimisation.

Mercedes-Benz F700
Mercedes-Benz F700

Mercedes-Benz F700
Mercedes-Benz F700

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