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Re: Non-Audi Five Cylinder Engines, Honda!
Ian J Haseltine wrote:
> > Gotta give honda a little credit with designing the ultimate nightmare, the
> > CVT (continually varying transmittion.)
> Dont you mean VTEC?
No. Variable transmission changes the input-to-output shaft ratios monotoneously via
a set of cones, unlike the conventional one, where a fixed number of gears provides
a number of discrete torque transfer values.
VTEC, OTOH stands for Variable Intake blah blah something.
Valve/pistonstrokes have different frequency of operation across the engine's RPM
band. It's a typical occillating sys that has it's unique natural frequency and
During the operation a phenomenon of standing waves occures. It is said that the
engine gets filled by mixture more efficiently when the SWR (Standing Wave Ratio) is
at a certain value, which depends on the resonant frequency. Now, that very
frequency depends on the geometry and volume of the intake. For example, a
particular configuration, that is ideal at 2000rpms (the intake length is equal to
the even number of half-wavelengths) may be a real killer at 5000rpms (the intake
length is equal to the odd number of half-wavelengths) and v.v.
A number of companies have solved this problem in a first approximation, by changing
the length of the intake depending on the rpms (Honda, VW to name a few).
'89 200TQ - 18psi (TAP)
'97 A4TQ - on the boat