What is the purpose for using vtec killer cam?


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kinki2046

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Actually what is the purpose for using vtec killer cam?
it is make the engine always on vtec?
it is to increase its torque or horsepower?

I heard their sour are noise and just like the motorcycle sound, like out of timing.
Will this can make engine damage?

What is the advantage and disadvantage for using vtec killer cam?

Thanks.
 
As far as I'm aware, the only real reason to use them would be if you were entering a race class that didn't allow variable valve timing. Although there can be other top-end benefits, as a good friend of mine has pointed out in a prior discussion:

Variable valve timing/lift has its advantages - great for a road car. If it's a race car and you typically live up in the rev range, say 6-9krpm, then you may not need it. And with the common close ratio gear kits these days it’s quite possible. Eliminating vtec means you lose rotational mass from the cams (not as many lobes needed), less inertia and friction, don’t need the LMA’s and you would gain a little oil pressure stability. It would also be one less variable to not have to worry about. In a B series you can go to roller rockers when eliminating vtec. With the rollers you can run a more aggressive cam profile so you get the valves accelerating open and decelerating quicker so you can get a bit more 'area under the curve’.
It’s a fairly extreme thing to do if you want results on the track but has some advantages.
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My understanding of Vtec is that it helps with fuel economy and makes the car more drivable at low speeds, I would think using vtec killer cams would be just like driving any other make of car with high lift cams , this would be fine for race cars they don't need to worry about low end drivability. I can't see that using vtec killer cams would damage the engine mechanically.
 
msc52 said:
My understanding of Vtec is that it helps with fuel economy and makes the car more drivable at low speeds, I would think using vtec killer cams would be just like driving any other make of car with high lift cams , this would be fine for race cars they don't need to worry about low end drivability. I can't see that using vtec killer cams would damage the engine mechanically.
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Correct, but also the smaller primaries offer better torque at lower engine speeds.

Bar a race engine which will spend most it's life above 6k rpm, Vtec killer cams aren't really suitable for other applications. Advantages would be, less valve train components(weight) and with the removal of Vtec operation it's said that oil pressure is more stable as obviously oil pressure is not required to engage the Vtec pin.
 
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