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Old 08-05-2014, 12:40 PM
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120mm Jedi 120mm Jedi is offline
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Thanks Andy, I'll do some more digging around.
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Old 08-15-2014, 05:29 PM
jgoedker jgoedker is offline
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I noticed a lot of comments about VCT and weather it's good or bad in a F150. I agree, probably not. But you have to consider the pressure on the manufacturers to squeeze more MPG's. Every gimmick has to be looked at.

As for VCT? Back in my sprint car days which were also the early days of cam timing, a lot of guesswork was put into this subject. Yes the power was gained at high RPM's. But, we also ported the heads to the max. Low RPM operation was not even considered. Ford using VCT does allow them to gain HP while leaving port sizes relatively small and therefor not effecting low RPM performance or producing hesitations at low RPM's. With the port and timing configurations we used, the engine would just about kill below 2000 RPM due to the large ports and high airflow. My 04 F150 I feel, is a very nice balance. Hopefully it all continues to work as it should.
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Old 01-14-2015, 10:55 AM
brentv8 brentv8 is offline
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Knocking cause and fix summary

Hi, after reading all this, I wrote up the summary below. Please shoot or add.

At low rpm's (<800) the phaser movement should be locked with a pin. It is common for this pin to break. With a warmed up engine the oil pressure at idle is too low to keep the phaser (with a broken pin) in place. It starts to "flap" around and takes the chain with it. This causes the knocking sound. When the engine is cold the pressure is higher because the oil is cold and therefore creates more pressure. Therefore when the engine is cold you wont hear knocking at idle. At higher rpm's the oil pressure is higher and keeps the phaser securely in place, hence no flapping and knocking sound.

In order to prevent "flapping" a phaser lockout kit from Livernois can be installed. This kit costs USD 699,-. This kit forces the phaser in a fixed advanced position. This means the variable timing feature is completely disabled. In order to make this work without the car throwing codes and possibly go into limp mode, a ECU reprogramming is necessary. Livernois confirms that the VCT solenoids are not necessary after installing the kit. They could even be left out completely. Im still trying to figure out why they offer a kit with new OEM phasers.



Last edited by brentv8; 01-14-2015 at 10:59 AM. Reason: typo
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Old 01-15-2015, 07:20 PM
blueovalandy blueovalandy is offline
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Sounds about right.

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Old 01-15-2015, 07:20 PM

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