Quote:
Originally Posted by mr220v
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?
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That should be the case, the reason why VVTi works so well and most manufacturers don't have multiple cam profiles like Honda is because by adjusting the cam's position alone you can cut out the overlap for stable low rpm operation, you can increase overlap in ranges where the acoustics will help scavenging, and at high rpm the valve closing point is more important than scavenging so you don't give up too much power, especially with a higher compression ratio.
The bore spacing is different between a 1zz and a 1nz, so it wouldn't fit, but I'm going to get a regrind on a spare 1ZZ cam to ~270 from 240 stock and then degree it so the peak is like maybe 7-10 degrees later. That would make the valve close 22-25 degrees later and open 5-8 degrees earlier, for a tiny bit of increased overlap (which hopefully doesn't cause any problems) and at low load it should be running at ~60% VE instead of the 77% or whatever it is at stock. The 1ZZ is only 10:1 compression so hopefully the tiny bit of extra overlap doesn't do too much damage.