Camshaft install tips and tricks
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|[[File:Bad lifter rollers.jpg|thumb|center|500px|Heavily chipped/pitted/galled lifter roller]] | |[[File:Bad lifter rollers.jpg|thumb|center|500px|Heavily chipped/pitted/galled lifter roller]] | ||
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+ | ==Effects of changing cam timing== | ||
+ | The cam timing, or phasing, can be changed at the time of installation by using a multi-keyway timing set, an adjustable cam gear like [http://www.cloyes.com/HighPerformance/Products/HexAJustTrueRollerSets/tabid/383/language/en-US/Default.aspx Cloyes Hex-A-Just], or by drilling the cam gear dowel hole and installing bushings. | ||
+ | |||
+ | ===Advance timing=== | ||
+ | *Open Intake Valve Sooner | ||
+ | *Builds more low-end torque | ||
+ | *Decreases piston to intake valve clearance | ||
+ | *Increases piston to exhaust valve clearance | ||
+ | |||
+ | ===Retard timing=== | ||
+ | *Keeps intake valve open later | ||
+ | *Builds more upper RPM power | ||
+ | *Increases piston to intake valve clearance | ||
+ | *Decreases piston to exhaust valve clearance | ||
+ | |||
+ | ==Effects of changing lobe separation angle== | ||
+ | The lobe separation angle (LSA) is ground into the cam at the time of manufacture and cannot be changed by the installer. | ||
+ | |||
+ | ===Widen (larger) LSA=== | ||
+ | *Raises torque to higher RPM | ||
+ | *Reduces maximum torque | ||
+ | *Broadens power band | ||
+ | *Reduces maximum cylinder pressure | ||
+ | *Decrease chance of engine knock | ||
+ | *Decrease cranking compression | ||
+ | *Decrease effective compression | ||
+ | *Idle vacuum is increased | ||
+ | *Idle Quality improves | ||
+ | *Overlap decreases | ||
+ | *Natural EGR effect is reduced | ||
+ | *Increases piston-to-valve clearance | ||
+ | |||
+ | ===Tighten (smaller) LSA=== | ||
+ | *Moves torque to lower RPM | ||
+ | *Increases maximum torque | ||
+ | *Narrow power band | ||
+ | *Builds higher cylinder pressure | ||
+ | *Increase chance of engine knock | ||
+ | *Increase cranking compression | ||
+ | *Increase effective compression | ||
+ | *Idle vacuum is reduced | ||
+ | *Idle quality suffers | ||
+ | *Overlap increases | ||
+ | *Natural EGR effect increases | ||
+ | *Decreases piston-to-valve clearance | ||
==Resources== | ==Resources== |