page_title: Wankel Diesel engine
section_title: Design concept
hierarchical_section_title: Wankel Diesel engine / Design concept
caption_attribution_description: Compound Diesel Wankel engine Rolls-Royce 2-R6. Verbunddiesel Wankelmotor Rolls Royce 2-R6. Baujahr 1972, 350PS bei 4500Upm. Owner Audi Tradition. English: A diesel wankel engine from Rolls-Royce with two double rotors
context_page_description: Wankel Diesel engine describes the idea of using the Diesel cycle in a Wankel rotary engine. Several attempts to build such an engine have been made by different engineers and manufacturers in the 1960s and 1970s. Due to technical problems and the general disadvantages of the Wankel design, the Wankel Diesel engine never left the prototype stage, and designing a Wankel Diesel engine capable of running under its own power is thus considered unfeasible.
context_section_description: A Wankel Diesel engine shares its basic design, a triangular-like rotor in an oval, epitrochoid-shaped housing, with a regular Wankel engine. The key difference is that it shares all of its operational characteristics with a Diesel engine. In addition to this, supercharging is required: A regular Diesel engine achieves compression ignition by a high compression ratio, which cannot be done in a Wankel engine due to the shape of the Wankel combustion chamber; supercharging ″artificially″ increases the compression ratio to ensure that compression ignition takes place. There exist several different approaches of designing a supercharger for a Wankel Diesel engine. Wankel designed an external supercharger, whereas Rolls-Royce added a secondary supercharging rotor of a bigger size, making the engine a two-stage rotary, which gave the housing an eight-like appearance.
caption: Rolls-Royce 2-R6 prototype, shaped like the 8-digit.
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