Simota CF650-6 Air Intake Review

[invader166]

Originally Posted by tmontague

There is no way that your rpm's dropped by 200. Gear ratios are a fixed thing that will not be changed regardless of air flow (unless wheel size or other is affected).

Your engine could very well be working less hard but the rpm's should be the same. Someone please correct me if i'm wrong

Yes way! While the gear ratios are constant (like you said), it's been demonstrated that it is possible to drop the RPM at which the engine reaches it's torque peak!

For example, Tooter was able to do this with his intake manifold spacer design:

http://www.yarisworld.com/forums/showthread.php?t=49609

The intake valves on your engine open and close. They are abruptly starting and stopping the incoming air. Now the incoming air has inertia so starting and stopping creates pulses, or pressure waves that travel back and forth inside of the intake manifold runners. If the runners are made longer the pulses will resonate harmoniously at a lower frequency because they have a longer distance to travel to get to the other end. A lower harmonious frequency means reaching peak torque at a lower rpm. More torque at lower rpm means the engine pulls stronger without needing to rev higher.