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 :-)

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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

Hi Paul,
My single rotor is almost ready to be assembled, because the side plates are all aluminum they have put in ceramic 1 piece seals with intention of reducing the side load on the side plates, I would be interested in your thoughts. They have also put a small hole in the e shaft that will squirt oil onto the rotor. Is it best to put the throttle at the start of the intake runner or on the engine? I will place the injectors at the start of the runners in a hope to get better mixing.
Andrew Campbell

I hope you are using Iannetti ceramic seals. There are some other ceramic seals on the market. If they shatter  everything in the engine is toast :-).

Iannetti have a very long and durable history.

That is a good idea. The Iannetti ceramic seals have a low coef. of heat expansion.

Two piece seals have tendency to grow in length due to the apex seal spring.

I assume they are Racing Beat end plates.

Keep the throttle on a p-port as close to the rotor housing as possible.
That improves the P-port idle. For some reason the TTC engine is not affected by this. it idles fine at 2000 RPM.It may be the turbo. The throttle is at the end of the runners ahead of the intake plenum.

Paul Lamar

I will find out about the seals, yes the side plates are from Racing Beat.
Andrew Campbell.


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