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==
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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.
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===Advance timing===
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*Open Intake Valve Sooner
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*Builds more low-end torque
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*Decreases piston to intake valve clearance
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*Increases piston to exhaust valve clearance
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===Retard timing===
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*Keeps intake valve open later
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*Builds more upper RPM power
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*Increases piston to intake valve clearance
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*Decreases piston to exhaust valve clearance
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==Effects of changing lobe separation angle==
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The lobe separation angle (LSA) is ground into the cam at the time of manufacture and cannot be changed by the installer.
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===Widen (larger) LSA===
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*Raises torque to higher RPM
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*Reduces maximum torque
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*Broadens power band
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*Reduces maximum cylinder pressure
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*Decrease chance of engine knock
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*Decrease cranking compression
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*Decrease effective compression
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*Idle vacuum is increased
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*Idle Quality improves
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*Overlap decreases
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*Natural EGR effect is reduced
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*Increases piston-to-valve clearance
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===Tighten (smaller) LSA===
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*Moves torque to lower RPM
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*Increases maximum torque
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*Narrow power band
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*Builds higher cylinder pressure
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*Increase chance of engine knock
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*Increase cranking compression
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*Increase effective compression
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*Idle vacuum is reduced
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*Idle quality suffers
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*Overlap increases
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*Natural EGR effect increases
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*Decreases piston-to-valve clearance
  
 
==Resources==
 
==Resources==

Revision as of 05:34, 12 December 2012

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