> Torque peak is not only a function of pipe length
     > but also a function of diameter as shown in the least chart.
     > Perhaps something to due with Helmholtz theory.
     >
     > Paul Lamar ...No rotor no motor.

    Paul,

    OK I give up.  What is the red object that looks suspiciously like
    another
    spark plug.  It is too far down to be a leading plug and too far away to
    provide an exhaust gas scavenging spark.  So is it a  water
    injection port?

    DougFir


    Somebodies idea of where to put another spark plug.
    Richard Konnen I would guess.

    Paul Lamar ...No rotor no motor.

Paul,
 The electronic revolution is making it's way into consumer motorcycles.
The newest Yamaha R1 (1000cc repli-racer) is being fitted with a servo
motor driven 2 position variable length intake. Not enough throw to
duplicate the LeMans engine, ...yet.
Bill Jepson

Here are pics of the Lemans engine mechanism for the new guys.

Paul Lamar

It is hard to argue with success. That being said, it is mind boggling
to think that degree of complexity and consequent weight would be
optimum.

Doc Custer
Retired software engineer and sometime Audiologist
Building RV9-A. Fuselage


For a race car Doc. Not an airplane. Max instantaneous
acceleration is only a function of torque. The speed range
at Lemans varies from about 60 MPH to 220 MPH.

Therefore you want max torque at all RPMs. Not possible with
out variable length runners. Since about the most
number of gears you can get in a gear change box
is about six the RPM will vary about 1500 to 2000 RPM from
gear to gear.

The RX8 has a very complicated intake system for that reason.
It also broadens or flattens the BSFC curve because peak BSFC
(min fuel burn per HP) happens at peak torque.

The theoretical ideal is an infinitely variable ratio
gear box so peak torque can be at peak RPM along with
peak HP. In that case you can do away with variable intake
runners. Some passenger cars have those today. They are
typically used in hybrids as well.

Diesel electric locomotives also have that situation in effect.
The Diesel electric locomotive is a hybrid of sorts.
The diesel runs at roughly one RPM connected to a huge
generator. The electric load on the generator is varied by
the mechanical load placed on the electric drive motors.
Diesels prefer running at one RPM.

In an airplane you change prop pitch if you can.

Paul Lamar ...No rotor no motor.

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