On 02/03/2016 09:26 AM, Carlos Ferrari wrote:
 World


 Mazda has over 100 engineers working on a breakthrough on one of the
 world's strangest engines

 William Fierman,Business Insider Tue, Feb 2 7:31 AM PST
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 Mazda RX Vision(Mazda) Mazda's RX Vision Concept, which the company
 promises will be rotary-powered.

 Mazda currently has more than 100 engineers working on its
 next-generation rotary engine, according to a company spokesman. The
 engine, a strange, piston-less internal-combustion unit, has defined
 the brand — largely for a dedicated group of motor-heads — since its
 first production run in 1965 in the Mazda Cosmo. Unable to overcome
 several disadvantages of the engine, including poor emissions, fuel
 economy, and torque output, the Japanese make ended its usage in
 2012, when the RX-8 fell from the lineup. Many car companies have
 defining characteristics — Volvos are safe, Toyotas are economical,
 Minis are, well, mini — but few have stuck to such a specific
 engineering concept for as long as Mazda. Rotary engines are simply
 an indelible part of the company. Research, according to Mazda's
 Jeremy Barnes, has never stopped, and the company hopes for a
 breakthrough in the next couple of years. "There's this incredible
 passion [for rotary engines] within the company," Barnes said. And
 outside the company. Barnes calls their loyal fans "rotor-heads" —
 people who, like Mazda's engineers, are obsessed with the
 high-revving, almost vibration-less engines and eagerly wait for
 their return. The company revealed the beautiful RX Vision concept
 car at the Tokyo motor show last year, expecting any future
 production run of the grand-tourer-style vehicle to be powered by a
 new rotary called the 16X. But it's difficult to say when the
 engineering challenges that killed the previous 13B engine will be
 overcome. Upping the displacement from 1.3 to 1.6 liters is one way
 they hope to add to torque output, but the emissions problem
 persists. Mazda engineers hope that they can apply years in
 development of fuel efficiency in piston engines, which they dubbed
 "SkyActiv" technology, to new rotaries. But the largest efficiency
 problem persists because of the fundamental design of rotary
 engines. Unlike the piston engines found in today's cars, which keep
 oil out of the combustion chamber, rotaries must also burn oil,
 making emissions dirtier. But the road isn't the only place devoid of
 the rotary. After the howling, rotary-powered 787B
 <https://www.youtube.com/watch?v=az39eqLIbyU won Le Mans in 1991 —
 making it the first and only Japanese-made car to do so — the rules
 were changed significantly, and while rotaries weren't banned
 outright from racing, regulations made the engines "almost
 immediately uncompetitive," Barnes said. While Mazda never stopped
 racing, its signature engine has been sidelined. But what about a
 rotary-powered return to endurance racing? "If we can make a
 significant breakthrough, it's possible," Barnes said.

 Antonio Silveira

Some of this is wrong. My 2004 RX8 passes draconian CA smog rules
with flying colours despite an additional 1/2 oz of 2 cycle oil per gallon in the fuel.

Rumour has it it is a F1 style turbo compound hybrid.

Paul Lamar

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