Quote:
Originally Posted by Ecky
I'm fairly certain BMW uses EIVC, but I suppose there also have infinitely variable lift.
It doesn't seem unreasonable to be to have two cam profiles, perhaps one very low RPM profile with a switchover as low as 2500RPM, which is intended for EIVC.
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That's right, Multiair, Valvematic, Valvetronic, and VVEL are EIVC, since they reduce lift and duration together.
What you see with the Honda R18 and K20C2 is 1 LIVC and low lift cam and 1 normal duration cam. The R18 would use the normal cam all the way to the rev limit but the K20C2 uses the big cam at >6100rpm for powah.
LIVC without excessively high lift is better for pumping losses than EIVC since you draw air through a bigger opening, and there's also a little less negative work from compressing air heated by the cylinder walls. Ideally, you'd be able to close the intake valve at 300 degrees ATDC while idling.