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Old 02-06-2014, 04:04 PM   #1
ShadowFocus603
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SVT upper cam cover

Alright so as of today I have all the parts in my possession to do a VCT delete with new timing belt and tensioner as well as a new water pump. I also went with adjustable AEM Tru Time cam gears. I know the standard modus operandi for most is to completely remove the upper cam cover to show off the adjustable gears but does anyone know if a standard Zetec cam cover will fit once the VCT pulley on the intake cam is removed? I'd like to have the option of covering the gears if I don't dig the whole exposed gear shirt grabber style. Thanks. And before anyone asks, I am deleting the VCT 1) because it doesn't appear to be working (no noticeable change past 6000rpms or anywhere else) and I don't want to shell out the money for a new solenoid and 2) because I'd much rather have full control of as much as possible in my engine. The car will be getting tuned in a couple weeks so I will have Tom provision for that as well for the mods I have done.


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Old 02-06-2014, 04:08 PM   #2
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Your not suppose to feel anything above 6000 it doesnt work like that , Why do you need a new solenoid , Your in for a lot of work

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Old 02-06-2014, 04:27 PM   #3
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Alright well maybe I am misinformed then. I was under the impression that there was supposed to be a change in sound from intake at 6000ish due to the camshaft phasing. I assumed the VCT wasn't working and that the solenoid was likely to blame. I guess that's my duh for not doing more research. Live and learn I guess. Anyways it'll still be nice having the adjustable gears I guess. Hope to find somewhere here in NH that is able to dyno tune so I can dial the gears once they are in. Tom are you able to test and tune local to you? I've been tempted to just swing down your way this spring rather than mess with etune after etune.
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Old 02-06-2014, 07:03 PM   #4
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Remote tuning is easy to do and I do a lot of the hard work for you

If your VCT isnt working properly then you would get a code for it , if it is working properly I would leave everything as it is , you will have no gains from doing adj cam gears on the SVT

A tune will do far more for daily driving and performance

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Old 02-06-2014, 07:41 PM   #5
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It's the intake manifold that switches over at a certain rpm, not the VCT. The VCT is just there for emissions in place of the EGR valve.
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Old 02-24-2014, 01:19 PM   #6
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when i unpluged my VCT Solenoid not on purpose i notice a huge issue with the top end not pulling as hard as it should. if you want to delete it more power to you. but good luck finding someone to dyno tune around our neck of the woods. all the dyno guys said no to me. so i just got a wideband o2 and tom tunes my car. couldnt be any happier! :)
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Old 02-24-2014, 01:37 PM   #7
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oh! I see what your getting at, I like where your going with that. After you delete the VCT gear, and install the regular sized cam gear a different a zetec cam gear might fit.

I was just thinking about this when I get mine put back together, sounds totally worth picking out of the junkyard to see if it fits. I was also looking at the spark plug cover and thinking about picking up a regular one with the delete plug too.
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Old 02-24-2014, 04:28 PM   #8
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Deleting the VCT on a street driven car makes absolutely NO sense. It's true that it helps with emissions but it is also great for performance .The secondary intake runners and the VCT work in tandem to help the engine extend its usable RPM range. Having electronic adjustment of cam timing is HUGE when it comes to calibration. I only wish they had fitted VCT on the exhaust as well.
If you had an engine that was steady state such as a full on race engine then yes, deleting it may be advantageous. But for a street driven car leave it alone. The solenoid doesn't cost much and as Tom stated you would have a CEL if you had a problem.
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Old 02-24-2014, 04:55 PM   #9
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I pulled this off of FJ somewhere since its better written that what I would write.

Basically though, no the VCT doesn't and last i check still can't be tuned for the most power. It comes down to the fact you really just can't control what the gear is doing with your tune. However with the little benefits of some power you lose some driveabilty and emission(as mentioned you have to want "because race car" to remove it).

Keeping will actually (in theory) work excellent in areas that you need a emissions sticker and want a modded car, without it you will most likely fail even with a tune.

The runners switch over to short runners at a optimal time allowing for higher rpms and more power in the higher rpm range that long runners would fall flat. Short runners alone would do this but how long are you going to daily drive that kind of vehicle around as an adult.


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Actually, the exhaust VCT is there for both emissions and power, depending on what you do with it. The same is true for most variable cam timing systems, from different manufacturers.

For example, VTEC allows Honda to use an emissions friendly cam profile at low rpm where the high rpm cam profiles would have emissions problems and very low torque. Conversely, VTEC allows the use of high rpm cam profiles above the range where the low performance, emission friendly cams run out of spunk. Which is it, emissions or performance ? The correct answer is both.

A similar situation exists for the BMW VANOS system which is nearly identical to Ford's VCT. VANOS was first introduced on the exhaust side on BMW engines.

Unfortunately Ford did very little to develop the exhaust VCT to it's full potential. I wouldn't bother trying to develop the VCT in the older Zetec, since Ford and Mazda are moving to more advanced engines at this time.

Exhaust VCT was first developed for the European Zetec to allow the use of longer duration, higher speed cams while maintaining emissions compliance. German emissions requirements are as stringent as those in the US.

The intake cam on the VCT Zetec is 214 deg at 0.050 with 0.367" lift. The Focus intake cam is 206 deg with 0.353" lift.

The VCT exhaust cam is 211 deg at 0.050 with 0.338" lift. The Focus exhaust cam is 205 deg with 0.242" lift.

VCT allowed Ford to eliminate EGR and use the longer duration cams installed with less overlap at idle and low rpm. As VCT becomes active the exhaust cam is retarded up to 60 cam degrees. Under certain conditions, with high cam retardation, the exhaust is sucked back into the cylinder on the intake stroke simulating EGR operation.

With VCT off, the cam timing has less overlap than you might expect with these cams. The benefit is better idle and low end torque. People who have eliminated VCT have found they need to retard the exhaust cam 6-8 (cam) degrees for optimum high rpm power.

The potential exists to use intermediate amounts of VCT to optimize cam timing for power. As you retard the exhaust cam, you increase overlap and move the HP peak upward. Both benefit power up to a point.

With VCT active you can use somewhat more aggressive cams and pass emissions in even the most stringent states (if you know what you are doing.) if you are careful to keep intake/exhaust overlap within reason at idle and low rpm.

Unfortunately, Ford did not develop this idea to it's full potential.

The CWQ3 S/R PCM code (which is not 50-state emissions legal for obvious reasons) made limited use of VCT timing to get more potential from the ZX2 cams. Stock rating on this engine was 146 HP and 140+ ft-lb of torque, without EGR and even with the terrible ZX2 log exhaust manifold. There was a 147 HP VCT Zetec 'crate engine' that was sold to tuners in Europe. "muahhahaha" to you, too...

Most stock CWQ3 S/R's dyno at 120+ WHP and with even more using mild tweaks (UDP, Focus exhaust manifold or header, cut intake, etc...)

Another idea with potential that Ford let go to waste...
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Old 02-24-2014, 05:13 PM   #10
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That post pertained to the Escort ZX2 exhaust VCT not the SVT Zetec intake. However I see what you are saying based on that post. BUT my personal experience is that is helpful to have. Especially if you are willing to have a custom exhaust cam ground for your turbo application. Not saying anyone ever did that :evilgrin
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