Quote:
Originally Posted by serialk11r
Not really. Nissan VQ37s hit 7500rpm but they seem to have very high oil temperature when run at high speed (and their specific torque isn't all that great at the top end) suggesting there is some serious friction going on. No Toyota Valvematic engine runs over 7000rpm.
Camless valve actuation sounds nifty but yes, bent valves when power is lost is a problem.
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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.