peak torque
for familiar engines
RX8 150.2
Chevy truck 157.3 pushrod 2 valves low comp ratio
Cont IO-360 171 pushrod 2 valves low comp ratio - but some
resonant
boost
Hyundia 163
NissanMX 180
Le Mans 211 full race engine - over 3 psi resonant
boost
Ferrari 200 advanced street engine
And you do not want to even see what a stock 13B does. Vance
Your right! I give up! The engine is a shitty 4 liter engine. No
more use
in aircraft. The BMEP is not up to piston engine standards. Besides
all
that
it is missing a bunch of essential parts like pistons, crankshafts
and
poppet valves.
No way will the FAA ever certify a rotary.
I only ask one thing Vance. I want you to send me a messages stating
unequivocally, without if ands or buts, that the 13B is an 80 cubic
inch
displacement engine.
Paul Lamar
Sorry - While I will gladly state that the Wankel is a fine, inovative
engine with
amazing packaging size for the swept volume, and will make a very
satisfactury
aircraft power plant (especially with it's robust construction and
reduced
catastrophic failure modes) - you will see an evil looking fellow with
horns
and tail
lining up to buy long johns and down jackets - before I agree that it
is an
1.3 liter
engine. Although I am a firm advocate of truth and honesty in
engineering, I
have
to admit the fact that Mazda is continuing to screw the Japanese tax
man
does not upset me. Vance Jaqua
You must have read my mind. I was about to get on your case. Then you
must also admit your bogus (your word) BMEP calculations are based on
your
over estimated bogus displacement :)
You also failed to answer 50% of the exam so you get an F. I will up
your
grade to a C - and give you another chance to answer the last question.
Name another 2.6 L street engine that gets 250 HP like the RX8 engine
does?
BTW H. Heisler in his book Advanced Engine Tech also disagrees
with you. He states it is equivalent to a two cylinder four cycle
engine of twice the displacement. Just like a two cycle is equivalent to
a four cycle of twice the displacement. You are out of sync with the
world
on this point alone Vance :)
Paul Lamar
We will have to add R.F. Ansdale to the list of world famous authors
writing
on the rotary engine that disagree with you. Here is one of his
illustrations.
Ansdale also mentions the two stroke displacement equivalency to twice the
four stroke displacement. You do agree that a two stroke is equivalent to
a four stroke of twice the displacement do you not?
Next I will examine Jan Norbye's book on the subject of displacement.
Paul Lamar
If that mid row example is supposed to represent the Wankel as by Mazda, he
is exhibiting
a total lack of understanding of the Wankel system - When has a single rotor
had a
John Deere firing order - -ie put put-------put put------- put put? The
minimum volume
(tdc at power stroke start) is not when the point of the rotor protrudes
into the top (in this
sketch), it is when the flank of the rotor lays against the necked section
where the spark plugs
are, BDC maximum expansion is when the flank faces one of the enlarged ends
of the housing,
and travel from TDC to BDC requires 270 degrees of E shaft rotation ( as
differing from
180 degrees of a conventional crank. Actually this is also 180 gegrees of
the eccentric
rotation relative to the rotor. This guy is really clueless.
I think my illustration is much more correct (which compares it to a 3
cylinder radial
true to my displacement exhortations. Both engines are shown with clockwise
rotations
(altho on second look my flank numbering is anti-clockwise - in the order
they approach
the spark plug) cylinder numbering is clockwise.
Vance Jaqua
Your diagram is totally bogus. You are comparing a 3 cylinder engine
that fires one and a half times per 360 degrees with a one rotor
engine that fires once in 360 degrees. You are fixated on the rotor
rotation when it has nothing directly to do with the amount of fuel and
air processed in unit time. The reference for the unit time is the RPM
of the output shaft and NOT the rotation of the rotor. Again HP
is the amount of air/fuel processed in unit time.
Here is the Ansdale proper comparison with a 3 cylinder engine.
Note there is an engine that looks like the Mazda but the housing
rotates with a different gear ratio to the rotor. There are many variations
on this type of rotary engine. Many of which are covered in the
Ansdale book.
Here too is the info from the Norbye book on the displacement
comparison.
Get some of the books I mentioned and read up on the wankel engine.
I don't think you understand how the Mazda wankel really works.
Paul Lamar
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