MP3 Vs. '94 civic EX
#16
Re: VTEC
Originally posted by nate0123
One thing I've always wondered about variable valve timing is that, if they can enhance performance in a narrow band - doesn't that mean the car could perform better if the altered timing were applied to a wider band?
Another way of thinking about this is that the car is being choked up to 5500 rpm... For fuel economy?
One thing I've always wondered about variable valve timing is that, if they can enhance performance in a narrow band - doesn't that mean the car could perform better if the altered timing were applied to a wider band?
Another way of thinking about this is that the car is being choked up to 5500 rpm... For fuel economy?
that's the gist of variable valve timing and what its main objective is. The details I cannot explain as I did not take the time to study into it. But to answer your question, changing the timing to open up the alternative valve timing profile at a lower rpm MAY increase top-end power output, but it will almost certainly KILL any tiny bits of low RPM torques these high revving 4 cylinders have....
Edwin or Jesse or anyone more informed can go ahead and correct any misinformation that I may have pulled out of my a$$, but I think I've cut that to a minimum
#17
There's specific timings that make the engine run optimally at different RPMs. Ferarri implements cam lobes which are elongated from side to side to allow for highly optimized cam timing at every engine speed. As RPMs increase, the camshaft slides sideways a bit and that way the timing changes and the engine always performs very well.
VTEC is basically the same thing, but the timing is optimized for only one narrow band of engine speed (on my friend's Si it kicks in at around 5500 rpm and goes all the way up to 8200 rpm).
VTEC is basically the same thing, but the timing is optimized for only one narrow band of engine speed (on my friend's Si it kicks in at around 5500 rpm and goes all the way up to 8200 rpm).
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