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Wankels are interesting engines, really.
They use a 3-sided rotor that spins and
kinda slams into the side to compress or
exhaust gasses. The main problem with
Wankels in sealing loss. They need seals
to keep the cycles sealed in their specific
chamber. The problem is that the seal
go from the extreme temperature
of combustion straight to the cold
temperature of intake and in the process
they expand and contract, resulting in
some seal loss.
We have scavenged piston engines, why
not wankels? I propose a wankel engine
that has rotary valves, much like the
Coates Patented Rotary Valves (link).
There would be two of them in each spot
and they would be in the 2 places where
the rotor is at its greatest expansion.
This is because with the scavenged
design, the place of combustion would
change each time. Since by scavenging
the exhaust and intaking all at once, this
frees up an extra cycle. This means it can
start the process over again that much
sooner. This means there would also be
sparkplugs in the two areas where there
is the greatest compression.
So the wankel gets its intake and exhaust
all in one, making it more efficient as
both cycles individually are inefficient. It
also makes more power since it would
have twice the combustion strokes per
every rpm. It also prevents seal loss due
to temperature change because the fact
that the intake and exhaust happen all at
once and the fact that it varys each time
mean that there is essentially no great
temperature difference from cycle to
cycle. And the rotary valves allow for
variable valve timing so more control on
low rpm and high rpm performance.
Coates Rotary Valves
Pretty cool [acurafan07, Nov 16 2007]
[acurafan07, Nov 20 2007]
||Sorry to be way off tangent here, but does a wankel lubricate itself? If so, then perhaps a grease wankel would be cool. I'm tired, gn.
||This idea doesn't seem very good to me right now, but I'm tired too...
||I don't think it would work the way you describe it. You would first need to change the shape of the path the rotor takes, and then change the motor design itself.
||But, scavenging a wankle, [+]
I don't understand your drawing, are you still using the original intake/exaust ports? If not, how is the air exiting the block, I only see it entering. You need an in and an out for scavenging
||Actually, in both places where you see a rotary valve, there are actually two side by side (one for each purpose). You just cannot see it since the drawing isn't 3D. These are the only open ports in the entire engine, and I think it would be pretty easy to implement on the current design of a wankel.