Patent Diagrams Reveal Direct Injection Mazda Renesis Rotary Engine

Mazda direct injection rotary engine patent diagram
Mazda direct injection rotary engine patent diagram

A patent application describing a new Mazda Renesis rotary engine with direct injection has recently surfaced.  Filed this past October in the United States, the application describes the engine in explicit detail, and includes various drawings of the machine as seen from multiple angles.

Mazda showed off what they called their Next Generation Renesis on the Mazda Taiki concept seen at the 2007 Tokyo Motor Show.  The company described the engine as having "a longer stroke and larger displacement", that would increase torque from low to high RPMs, and increase "thermal efficiency."  The engine was written about as having direct injection, and a housing built of aluminum.

Amongst some of the details outlined in the application are spark plug placement, side air intake, and side exhaust.  All of these have been pointed out for their ability to improve "combustion stability" within the engine.  Specifically mentioned is the elimination of an overlap between the "intake open timing" and "exhaust open timing", which the company says should also reduce fuel consumption.  Not yet determined is the engines maximum number of RPMs, and therefore the size of the rotor's triangular face, as mentioned on page three of the filing.

This, combined with the omission of housing dimensions, suggest that the next Renesis could be a different size than the currently available 1.3-liter model.  It is possible that Mazda is trying to stake a claim on multiple engines produced in the manner described.  Translation: Mazda may give consumers more than one engine choice on the second generation RX-8, if they begin production of this engine type.

Mazda has used various versions of the Wankel Rotary Engine since the 1960s.  After testing an early model, they introduced a 798cc version on the Mazda Cosmo concept shown at the 1963 Tokyo Motor Show.  The Japanese automaker began production of a larger model two years later.  Other models that have used the rotary engine include the RX series, the R100, and the Luce.  The engine is named for self-taught mechanical engineer Felix Wankel.  Wankel lived out much of his life in Germany, where he built seals and rotary valves for the Luftwaffe during World War II.  He began work on the first rotary engine in the early '50s, completing a prototype in 1957.


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Comments (4)

joelynn joelynn
It is a slightly strange obsession of Mazdas- because it is so fuel inefficient
May 29th, 2009 12:04am
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Ash Ash
The 70mm and 76mm Width of the rotors shows there are two engines one of 1.6 litre and the other 1.8, the later could be used in their Hydrogen applications, this is part of the reason why Mazda has persisted in the development of the rotary engine as it works efficiently with both Hydrogen and normal petroleum (gas), you will more than likely see a "Duel" fuel Rotary in a few years time. The series II (09) RX-8 RENESIS has many of the 16X features, new oil pump and oil metering pump design with two extra lubricating nozzles for the Apex Seals, this now actually uses less engine oil as distribution is more even than the 04-08 RENESIS I engines. The side intake and exhaust treatment is not new and is already used in the existing RX-8 engines. What is new are the longer stroke rotors and aluminum side housings. Fuel efficiency gains are from Direct injection and elimination of port overlap. So, you will see the new 16X in an all gas engine rotary with about 290HP , and the larger 18? in a hybrid duel fuel. Mazda are to be applauded for continuing to refine this great engine to a point where they can now call it their own.
May 27th, 2009 1:21pm
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if i'm mot mistaken, the explanation of the new rotary is already being published in Mazda site http://www.mazda.com/mazdaspirit/rotary/16x/
May 27th, 2009 1:35am
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A great engine. I wunder how much more economical it would be. It's a 1.3 with the fueleconomie of a v8, I'm a bit amazed that they don't cancel this engine. They must be very confident about it. Still, no turbo on this engine, deffinately a plus point
May 26th, 2009 10:36pm
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