Quote:
Originally Posted by serialk11r
Again you're sorely mistaken. Overlap is for exhaust scavenging, late valve closure is for maximizing volumetric efficiency due to acoustic intake effects. The inertia of the column of air traveling down the intake provides very significant pressure at the peak of the "wave".
Some engines have nominal 300 degree cams. Do you really think these cams close right after BDC? Hint, they close LATER than a 1NZ-FXE.
This is why I'm getting my 1ZZ-FE intake cam reground for higher duration: Improved efficiency AND improved peak power.
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What I suspect with the 1nzfxe is that the way this intake cam is degreed, you get less scavenging than you otherwise could.
I wonder if the 1zrfxe intake cam would fit the 1zz?