Variable valve timing

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06-02-2009, 07:23 PM

Neil_E.

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Variable valve timing

I have heard that the 5.4 has variable valve timing. Is there a specific RPM point where the valve timing change occurs? Does it alter only the exhaust valve timing?

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06-03-2009, 11:30 AM

krewat

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I think it's technically VCT (variable cam timing). No idea when it does it, but I thought it was a variable thing as the RPM/load requires.

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06-03-2009, 11:48 AM

DavidB

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Vct

For a pretty good "generic" explanation, look here:

How Variable Cam Timing Works VCT

I believe that Ford also uses it to control the exhaust gases remaining in the cylinder and thereby eliminating the EGR system.

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