Quote:
Originally Posted by Joeggernaut
7500prm is no joke on a 3.7L v6. That is pretty high but I get what you mean. Too-bad toyota doesn't use the valvematic design and make it run like the old vvti-L. Those little celica gt-s pulled pretty good once lift engaged.
Most applications of this design seem to be targeted a slightly smoother torque curve and fuel consumption instead of performance output. Wonder what the long-term liability is like with these cvvl technologies.
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Actually I think the performance is "at its best", because they can utilize a higher maximum lift and duration at the top end with zero low end issues. The Valvematic ZR engines have more power than the non-Valvematic engines.
I think it's useful to think of it as similar to a pushrod valve engine, except the pushrods are lighter and adjustable length. The added mass puts more stress on the cams and requires stiffer springs, and creates more friction. You can rev them up, but the cams can suffer more wear (compared to an OHC engine).