Originally Posted by SStrokerAce

Now I think we are getting someplace!!!!!

Here is another graph that can show you the difference in which harmonic you are working on in a motor.

http://usera.imagecave.com/sstrokera...onicPulses.jpg

The sheetmetal example is working on a lower order harmonic that has stronger pulses.

The LT1 intake as you can see has lower peaks on it's pulses and therefore can't overcome the cylinder pressure as the valve is closing so the IVC has to be earlier.

This really does get to be a mental "beating"

BTW the motors in those two examples are vastly different the sheetmetal intake motor is 2 times + the power of the LT1 motor.

Bret