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2011-2014 Mustangs
Engine/Tuning
5.0 Coyote Valve Spring Upgrade: Brands, size, and price
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<blockquote data-quote="Shaun@AED" data-source="post: 13846734" data-attributes="member: 32381"><p>With reguards to spring pressure vs VCT movement we need to look at how the TiVCT system is controlled.</p><p></p><p>Unlike the 3V mustangs Ford utilizes the valve spring energy to move the Coyote camshafts. It then uses the VCT phasers to 'hold' cam timing using oil pressure inside the cam gear similar to the 3V's.</p><p></p><p>Where:</p><p></p><p>(Oil pressure * area which it pushes * Radius from center) MUST be greater than (Valve spring pressure * Radius from center where it pushes on the lobe * number rockers not on the base circle)</p><p></p><p>Given the above, there IS a point where spring pressure can overcome the forces at work in the phaser used to 'hold' the cams at the target VCT. Where that threshold is I could not tell you, but you would likely see occilations from target via data logs when things start getting too much for the Phasers to handle, and of course it relies heavily on oil pressure, which can also vary.</p><p></p><p>Once this happens you will need to 'lock out' the VCT phasers.</p></blockquote><p></p>
[QUOTE="Shaun@AED, post: 13846734, member: 32381"] With reguards to spring pressure vs VCT movement we need to look at how the TiVCT system is controlled. Unlike the 3V mustangs Ford utilizes the valve spring energy to move the Coyote camshafts. It then uses the VCT phasers to 'hold' cam timing using oil pressure inside the cam gear similar to the 3V's. Where: (Oil pressure * area which it pushes * Radius from center) MUST be greater than (Valve spring pressure * Radius from center where it pushes on the lobe * number rockers not on the base circle) Given the above, there IS a point where spring pressure can overcome the forces at work in the phaser used to 'hold' the cams at the target VCT. Where that threshold is I could not tell you, but you would likely see occilations from target via data logs when things start getting too much for the Phasers to handle, and of course it relies heavily on oil pressure, which can also vary. Once this happens you will need to 'lock out' the VCT phasers. [/QUOTE]
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Engine/Tuning
5.0 Coyote Valve Spring Upgrade: Brands, size, and price
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