Several people have mentioned this.
Note a turbo charger is shown.
The oil drain back from the turbo will be improved.
I would be surprised if the patent office gave them
a patent. Too trivial IMHO.
Here is a jpg with the new configuration and simply rotated
180 degrees.
I can only see one or two advantages.
When the oil drains back from cooling the rotors it has
a cooler passage. it will also warm the cool side of the
engine which is a good thing. As it reduces the banana effect.
The hot Cat is located above the passenger seat foot well
instead of down by the drivers feet. This is an advantage
for the driver leading to more foot room.
There is a bit more length required for the intake so
that may lead to a more compact installation in a car.
I can't see how any of that will improve the BSFC.
Perhaps heating the intake with the hot oil will improve
evaporation of the fuel as it does in the Lycoming aircraft
engine.
Paul Lamar
Hi Paul,
what engine is this patent app for?
RX8 family or the new RX9?
Dave McC Perth Oz
I have no idea Dave. It is not hybrid turbo compound like a Formula One
engine
as I see no room on the turbo charger for a generator/motor. The RX9 is
rumoured to be just that
I don't think it will be applied to the RX8 car as that would entail a
complete
redesign of the car structure. If I were Mazda I would not go with the
larger
displacement 16B but would develop the current engine size. Some times
when the smallest of changes are made unforeseen consequences happen,
I have a six speed automatic transmission in my new Dodge motor home
with a 270 HP 3.7L Mercedes V6 and it is what Mazda really needs.
Instant down
shift when rapid acceleration is needed.
I just drove it back and forth across the country up to 7000 feet above
sea level and put 9,000 miles on it. It cruises at 80 MPH at 2300 RPM.
At a steady 65 to 70 MPH and only 2000 RPM t gets 22 MPG. The electric
retractable side view mirrors are worth one or two MPG in less drag.
Paul Lamar
As far as the 13B verses the 16B.
"Some times when the smallest of changes are made unforeseen
consequences happen," PL
Yeah, I agree. If more displacement is needed, then use a wider rotor,-
say 100mm
The Dodge V6.
Very impressive torque, obviously turbo induction.
Dave McC Perth Oz
Not a turbo.
It has a Helmholtz resonator tuned for 2000 RPM.
That give max torque at 2000 RPM and peak BSFC always occurs
at max torque. The torque curve is quite wide much like
the RX8 engine.
Paul Lamar
As per Mazda R&D the fuel burn does not travel sideways well when the
rotor width exceeds 75mm. This is why Mazda went back to 75mm wide
rotors. To increase torque they increase eccentricity and radius. A 12A
with a power recovery turbine equipped with variable geometry would
provide better results. Obviously any new engine will be equipped with
side exhaust ports. The difference in power between 12A and 13B does not
seem to be much with all else equal.
Dale Davies
I was puzzled why the 16B had narrower rotors, when they were chasing
displacement.
Thanks Dale,
Dave McC Perth Oz
One solution to fuel flame front with wider rotors could be to
implement dual plugs side by side at 1/3 the width.
Dale Davies
Yes side by side plugs and a wide pocket in the rotor.
Here is an Austro Engines AKA Diamond. At least 500
of these have been sold for AS motor gliders.
Opps forgot to attach the pictures.
Paul Lamar
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