[s-cars] New 5 cylinder vs. AAN

[Jared Robinson]

well, for the most part I was being facetious :D

However the seal problem is relatively resolved. They've gone back to a
thicker seal like the 12As, but they're making it out of some kind of
graphite composite that doesn't self destruct like it used to. Also the
change from a peripheral exhaust port to a side exhaust port reduces the
wears on the seals entirely.
Low fuel consumption is capable now with direct injection... however it's
not offered with it... yet.

As for the appetite for motor oil? that's expected: there are oil
injectors... the engine practically runs like a 2 stroke. Oil is a
consumable with a rotary engine.

Personally, I think Mazdas next trick is going to be a turbocharged, direct
injected rotary. the exhaust pulses on a rotary are really a great match for
a turbocharger. Direct injection should cure quite a bit of drivability
problems as well. The reason they suck so much gas is because the engine
isn't really all that efficient in it's design... The gas is port injected
and then had to swirl around with the rotor until it reaches the combustion
phase... so there can be a lot of fuel pooling in the intake port and on the
rotors themselves... injecting high pressure fuel during the compression
phase should be the cure.

The emissions problems were a result of the peripheral exhaust port being
fully open all the time and during the intake portion, there was an overlap
of the intake and exhaust being open at the same time, causing unburnt fuel
to be spit right out the exhaust port. with the side port exhaust, that
problem is nearly alleviated. Again, direct injection should cure that going
forward.

I expect the next rotary to be a 1.6L instead of a 1.3L. A 1.6L with direct
injection I would expect to make about 300bhp normally aspirated and upwards
of 400 with a single turbocharger.

I hope they do it.

Also, rotary engines are SUPER easy to fix... even without the ATF trick,
there's only a few moving parts in there

On Fri, Oct 15, 2010 at 9:22 AM, Peter Schulz <pcschulz at comcast.net> wrote:

> Better for what?
> What's your goal?
>
> rotories are not the best design when either torque nor low fuel
> consumption are desirable.
>
> As Herr Myers has pointed out, the rotorie's achile's heel are the seals.
>
> -
> On Oct 15, 2010, at 8:48 AM, Jared Robinson wrote:
>
> and this is why rotaries are better than reciprocating engines :D
>
> On Fri, Oct 15, 2010 at 6:46 AM, John Cody Forbes <cody at 5000tq.com> wrote:
>
> Yeah it's all down to piston acceleration and crank offsets.
>
>
>
>
>
> -Peter Schulz
> Chelmsford Ma, USA
> http://www.naaclub.org/
>
> 1995.5 S6 Avant Emerald/Ecru
> 1995.5 S6 Avant Silver/Platinum
> 1991 90Q 20v Q Red
> 1991 90Q 20v Indigo
> 1991 CQ silver  (eS2 recipient)
>
>
>
>


-- 
Jared Robinson