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Mazda Taiki
Mazda says Taiki's next-generation Rotary Engine 16X or "Renesis," a
1,600-cc (800 Ã? 2) powerplant with a new trochoid chamber shape,
boosts thermal efficiency and torque. These and other innovations help
make it a fuel miser. The shape change increases displacement. Still,
Mazda says the new engine is as compact and lightweight as the current
Renesis.

Lengthening the trochoid radius and eccentricity while making the
rotor housing narrower brought a longer stroke, thus shrinking the
combustion-chamber aspect ratio. And the surface area-to-volume ratio
of the combustion chamber dropped, limiting losses from cooling. The
smaller combustion chamber, the company says, promotes flame growth
for faster combustion and better fuel economy.

This is the first gasoline rotary engine developed to use direct-fuel
injection. The system inherits the basic design of the hydrogen rotary
engine, injecting gasoline in a high-pressure spray during the intake
cycle, promoting atomization and vaporization of fuel and formation of
a stable air-fuel mixture. The latent heat of fuel vaporization lowers
the temperature of the air-fuel mixture, thus raising the engine's
charging efficiency. At the same time, it reduces fuel adhesion to the
chamber wall â?? a problem for conventional port-injection systems â??
while promoting a more homogenous air-fuel mixture. This, in turn,
improves thermal efficiency and boosts torque.

Matt Prather

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