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Old 02-07-2010, 03:14 PM   #1
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VVT/ VCT... How's it work?

I'm just wondering how Variable Valve Timing/ Variable Cam Timing is actually achieved in an engine?

I heard that the 2012 Focus will have this (Ti-VCT).
I was trying to explain what VVT is to someone and realized I didn't know how it REALLY works. Does it vary the cam lobes or...

Help me out- Thanks!



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Old 02-07-2010, 03:39 PM   #2
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The vct system uses oil pressure to change cam timing by advancing or retarding the cam, at least on svtf's it's done this way.
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Old 02-07-2010, 03:43 PM   #3
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http://www.2carpros.com/how_does_it_...cam_timing.htm
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Old 02-07-2010, 05:14 PM   #4
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Thanks. Good stuff, both of you.

Now, I'm a curious cat, so here's a bonus question...
about how many WHP does the TiVCT add?
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Old 02-07-2010, 08:25 PM   #5
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Really hard to say how much hp variable cam timing adds to a particular engine. It's there for a variety of reasons, not just added hp. But, the new 5.0 mustang engine fitted with VCT on all four cams produces over 400 hp, NA!
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Old 02-09-2010, 04:58 PM   #6
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VVT/VCT allows for the engine designers to maximize the overall potential of a given engine.

w/o VVT/VCT the cam timing remains static, and you have to balance off things like performance, fuel econ, emissions, Torque VS HP etc.

with VVT/VCT the ECU can control Cam Timing to advance/retard the cams to optimize one or more characteristics, like less overlap at idle to provide a fuel efficient setting with very smooth idle, then under heavy throttle loads/higher revs it will adjust the cam timing for optimal power output.

It's the same reason someone came up with automated spark advance systems. Initially spark was fixed, and cars had a very limited power output, there was always a compromise that was needed to allow for starting and running hot or cold etc.

Then there were manual adv/retard settings in the cockpit, then mechanical advance in the distributor, and finally we now have fully electronic ignition controls that can even modify spark timing per cylinder with Coil On Plug type ignition.
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Old 02-09-2010, 05:01 PM   #7
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Old 02-09-2010, 06:01 PM   #8
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I like the illustrated URL that W8lifter provided us.
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Old 02-10-2010, 08:48 AM   #9
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This should be stickied, I've posted it three times as have others.

http://www.youtube.com/watch?v=Ba-oyIjGWGE
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Old 02-10-2010, 09:41 PM   #10
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TiVCT is more about efficiency i imagine than outright power
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