Nicks,

Thanks for the post. I'm glad to see all the conjecture and hyperbole regarding IMRC opening come to a close with your dyno evidence.

What's amazing to me is how clearly visible the effect of intake resonance on volumetric efficiency (hence power) is. Take a look at your early-stock-late IMRC opening dyno, and it's easy to see how the long runner's efficiency drops off and the short runner's picks up in that transition region. This trend is consistent for all 3 runs. You could easily curve fit a consistent %VE vs RPM curve for each intake path based on your results. All the IMRC changeover point does is decide which %VE curve (long vs short runners) is being used.

Guess this interest shows that I'm a dork engineer, huh? A colleague of mine calls plots like this 'engineering pornography'.

Thanks for the info.

-Kurt laugh

-Kurt

"I'm a little sceptical of that internet thing. After all, what's it got besides information?"
-DB, 1/97