Paul  It seems to me this engine set up is more or less what Tracy did
with his RV
The throttle body is a cut down of the standard RX 7 , and the primary
throttle plate
and barrel removed ,if i am not mistaken.

In such a set up A What type of rpm can you develop if you use the 3.1
redrive
planet and prop say for the falconair f12 in the photo B The dynamic plenum
volume i believe , must be 2,7 more than the volume of the intake
runners ,is this correct?
C Would it be better if the primary intakes (smaller diameter intakes)
would be
on its own throttle plate and chamber in the intake plenum and not been
removed
in the throttle body If you can help me on this
thanks

Le Roux  Breytenbach

Depends on the pitch and the diameter. Mainly the diameter is limited by
the tips
going transonic.

That plenum is a joke. It enhances the torque at 3000 RPM absolutely  where
you don't need it :-) I explained that to people many many times and
they still did it anyway :-)
I don't think Tracy ever understood it. Certainly not when he used it
for the first time.

Mazda did it because cars need low RPM torque for good acceleration in first
gear. Mazda called it a dynamic chamber.

Airplanes fly on HP and HP is RPM times torque. The more RPM and the
more HIGH RPM torque
the more HP.

You want max torque to happen at 6000 RPM or above. A simple runner 18
to 20 inches
long will give that with a p-port. You will get more HP with out the
dynamic chamber.

If Mazda uses the 16B in the new car it is a partial answer to the car
low RPM torque problem.
Torque is mostly related to engine displacement. The 13B is a small
engine for cars
or airplane engines. It 160 cubic inches while the typical light
aircraft engine
is 320 cubic inches. The 16B will be about 200 cubic inches if they make it.

The torque peak in my  New Dodge (Fiat) stealth motor home MB engine is
at 2000 RPM.
While I am at it I will mention the transmission is a computer controlled
six speed conventional manual transmission. The computer throws the
clutch out and
 shifts it with small hydraulic cylinders. Just like a Formula 1 engine :-)

-----------------------------------------------------------------------------------------

In 18 years of the newsletter there have been several situations like this.
Some one comes up with something that appears at first glance
to be an improvement. Someone else analyzes it and discovers draw backs
or it is simply undesirable for the new application. It might work in other
applications.

The first person lets his ego take over and refuses to under stand or learn what
the second person is saying.

In one case a new newsletter was formed by the angry first party :-)

To learn you must have an open mind and keep your ego in check :-)
Try to understand why the second party is saying that or just ask him
why do you think that?

Paul Lamar

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