Quote:
Originally Posted by aerohead
As a 'passive' component, in today's sophisticated world of sensors, ECUs, and servos, a non-controlled device like this might be a non-starter, and also redundant.
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If you have VVT of some sort; possibly aerohead.
But
I feel that the fact that its passive and relies on the air pressure difference between ambient air the pressure downstream of the valve is in fact the beauty/simplicity of the concept:
Hot and even stock cams open the intake valve before TDC for 2 reasons;
1: To take advantage of the pressure wave in a tuned length intake to start forcing a bit more air in
and
2: to take advantage of a tuned length exhaust pulse sucking exhaust gas out, better scavenging the cylinder.
At low revs (as used by ecomodders) this does not work and you get exhaust going up the intake tract.
That will/can not happen with a reed valve in place.
Similarly; at the end of the intake stroke the valve closes a bit late as the momentum of the inrushing air-fuel gives the engine a slight turboing effect.
At low rpms there is not enough momentum, so some of the air-fuel is pushed out the intake again.
Unless there's a reed valve...
Even the exhaust cam can be somewhat hotter as the reed valve will stop the backward flow at the end/beginning of exhaust/intake stroke.
Basically the intake valve only has to be closed for the power stroke with a reed valve fitted.
The reed valve will provide infinitely variable and almost perfect valve timing at any/all rpms...
IMHO
Any ECU etc would find benefit from and auto adjust to the advantages of the reed valve/s.
And, as said, the restriction of the reeds has been tested and only loses you about 1kw of top end/rpm power.