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Not to mention the risk of hanging the
apex seal on the slot, which is parallel to the seal.
On 1/26/2015 3:23 PM, James R. Osborn wrote:
I agree with Ernie. However I don’t think it is PEAK pressure in
the exhaust chamber as it is most of the way through the expansion
stroke by the time the apex seal crosses the plug hole - the
exhaust port is about to open whether it is a side port (rx8) or
peripheral port (rx7). It is probably higher pressure than the
intake chamber, but not by a whole lot.
I think the way it is currently implemented (as a
hole rather than a slot) leads to some EGR (exhaust gas
recirculation) which isn’t supposed to be a bad thing, at least
for emissions. I imagine however that the bad thing about
making it a slot is it would be more difficult for the F/A
mixture to get into the spark plug antechamber, and it also
might affect the flame front propagation out of the antechamber.
Both of these things would be bad for a rotary, IMHO.
— James
You are correct,
Jeff. That is what he is saying. The problem
is, he is wrong. When the apex seal is
crossing the plug hole, there is no
compression on the intake side yet (it's
actually below ambient for an NA engine) and
the exhaust side is at it's most extreme
pressure. Look at the volume of the
chambers. The intake side has just finished
pulling F/A mixture in, the exhaust side has
been ignited and is providing the power
pulse. If anything, some burnt mixture from
the previous burn is going to be pushed BACK
into the upcoming one.
In fact,
providing more of a slot might just blow the
F/A mixture away from the apex seal and solve
half of the quenching problem.
What he’s
saying is the spark plug holes
inside the rotor housing are too
large (much larger than apex seal
width) so at peak compression and
just prior to combustion, a
percentage of compressed air/fuel
mixture enters the spark plug hole
and leaks ahead of the apex seal
into the exhaust cycle, creating
spontaneous combustion in the
exhaust and higher exhaust
temperature. His theory is if the
holes were slots, similar in width
to an apex seal this would stop
any leakage into the exhaust cycle
– more complete combustion =
higher efficiency – don’t put air
fuel into the exhaust for
spontaneous combustion.
Jeff
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From:
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Subject:
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RE:
[FlyRotary] My
next engine
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Date:
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Sat,
24 Jan 2015
23:03:22 -0600
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To:
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