12 سلندر




5600CC-5.6Litre version was also fitted to the '95 – '97 BMW
850CSi



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The current CL 600, SL 600, CL 65 AMG and S 65 AMG still use the 12cylinder









w 16 engine

the 16cylinder



We need a 16-liter engine to burn 1.33 gallons of gas per minute. That actually makes sense — the engine in the Dodge Viper is 8.0 liters in displacement and produces 500 hp.
But there’s a problem: A 16-liter V-8 engine would be very large. And the pistons would be massive, so there would be no way it could turn at 6,000 rotations per minute (rpm). It might turn at a maximum of 2,000 rpm, meaning that you would need an immense 48-liter engine to generate 1,000 hp. Clearly an engine that big is impossible in a passenger car.
So howdid Bugatti fit 1,000 horsepower into a passenger car?

Bugatti did two things to create a compact engine capable of producing 1,000 hp.
The first and most obvious thing is turbocharging.
The Bugatti Veyron’s 16-cylinder monster engine produces 1,001 horsepower for a top speed of more than 250 mph. And it’s a passenger car. Check out the Bugatti. Amazing isn`t it?
VR6



Engines - Volkswagen W8



You know of the W12 in the Bentley and big Audis, and the W16 in the Bugatti Veyron but what about their smaller cousin on the Passat W8? According to some, "the most expensive engine ever put on a Volkswagen passenger ****. A block with staggered cylinders connected to a flat-plane crankshaft, all of it shoehorned into an engine bay that was never meant to receive it.

The four piece aluminum manifold is a beautiful thing in this age and age where most are made of plastic. It is really the only thing you can appreciate from the top side. Getting to the spark plugs is easy. Replacing the Oxygen sensors and working on auxiliaries - "a challenge" to say the least. Still, it really elevates the Passat platform to a whole other level (when everything is working well).


The one sitting in my car is still humming after 150,000 miles.
The piston arrangement and twin balance shafts are clearly visible in this diagram (Source)
Unusual cylinder arrangement makes for a short block of relatively square footprint.
The timing chain system and adjustable camshaft system. A duplex to the relay and simplex to the camshafts. I am still wondering how long those plastic guides will last. (Source)With the intake manifold removed, coil packs, fuel rails and that ridiculously expensive thermostat are clearly visible (Source).
Cylinder head (bank 1) showing valves, coolant, and oil passages (Source).
Engine block (bank 1) showing pistons coolant and oil passages (Source).
Very tight tolerances going on on that crankshaft! (More photos of engine internals at the W8 forum)
A good view of the lower crankcase displaying the oil pump (Source).












Having run the proof of concept engine, Ilmor is now looking to produce a second phase development engine for in-vehicle testing. The performance targets for this engine are as follows:

• Brake Specific Fuel Consumption of 215 g/kWh
  
  (10% improvement on current 4 stroke technology)

• 20% lighter than existing production engines

• محرك 3 سلندر خماسى الاشواط Power density of 150 bhp/L

Advantages of the 5-stroke concept

• A secondary cylinder provides an additional expansion process enabling extra work to be extracted, hence increasing thermodynamic efficiency.

• The engine runs an overall expansion ratio approaching that of a diesel engine – in the region of 14.5:1

• Minimised pumping work due to the downsizing effect from highly rated firing cylinders.

• The compression ratio can be reduced to delay knock onset without a reduction in performance.

• Because the firing cylinders can be very highly rated, the engine is relatively compact.

• The fuel consumption does not rise as rapidly with increasing BMEP, as retarding rejects more energy into the expansion cylinder.

• The engine uses 100% conventional technology and so requires no new manufacturing techniques.

5-stroke performance figures

• Engine capacity 700cc (turbocharged)

• Peak power 130 bhp @ 7000 rpm

• Peak torque 166 Nm @ 5000 rpm

• Fuel consumption of only 226 g/kWh

Ilmor is using its race engine expertise to bring developments to the field of energy efficient engines. Motor racing is not generally associated with fuel economy, but the lessons learned during periods of intense engine development can be applied with great effect to create highly fuel efficient engines.