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Types of Valve Lifters....................................................................................... 2
Hydraulic ................................................................................................................................................................2
Variable Duration Hydraulics .................................................................................................................................2
Solid .......................................................................................................................................................................2
Roller ......................................................................................................................................................................3
Lifter Diameter........................................................................................................................................................3
Oil Aeration ............................................................................................................................................................3
Types of Rocker Arms ...................................................................................... 4
Stamped Steel........................................................................................................................................................4
Aluminum Roller Rockers ......................................................................................................................................4
Stainless Steel Roller Rockers...............................................................................................................................4
Shaft Mounted Rockers .........................................................................................................................................4
Additional Rocker Arm Information ..................................................................... 5
Rocker Ratio’s........................................................................................................................................................5
High Ratio Rockers ................................................................................................................................................5
Pivot Points ............................................................................................................................................................5
Optimizing Valvetrain Geometry......................................................................... 6
Pushrod Length......................................................................................................................................................6
Checking Pushrod Length......................................................................................................................................6
Geometry For Best Power .....................................................................................................................................7
Valve Spring Information................................................................................... 8
Delivered Force......................................................................................................................................................8
Spring Surge ..........................................................................................................................................................8
Crankshaft Torsional Dampers ...............................................................................................................................8
Spring Dampers .....................................................................................................................................................8
Constant Rate Springs...........................................................................................................................................8
Variable Rate Springs ............................................................................................................................................8
Barrel Wound Springs............................................................................................................................................9
Multiple Springs......................................................................................................................................................9
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Types of Valve Lifters....................................................................................... 2
Hydraulic ................................................................................................................................................................2
Variable Duration Hydraulics .................................................................................................................................2
Solid .......................................................................................................................................................................2
Roller ......................................................................................................................................................................3
Lifter Diameter........................................................................................................................................................3
Oil Aeration ............................................................................................................................................................3
Types of Rocker Arms ...................................................................................... 4
Stamped Steel........................................................................................................................................................4
Aluminum Roller Rockers ......................................................................................................................................4
Stainless Steel Roller Rockers...............................................................................................................................4
Shaft Mounted Rockers .........................................................................................................................................4
Additional Rocker Arm Information ..................................................................... 5
Rocker Ratio’s........................................................................................................................................................5
High Ratio Rockers ................................................................................................................................................5
Pivot Points ............................................................................................................................................................5
Optimizing Valvetrain Geometry......................................................................... 6
Pushrod Length......................................................................................................................................................6
Checking Pushrod Length......................................................................................................................................6
Geometry For Best Power .....................................................................................................................................7
Valve Spring Information................................................................................... 8
Delivered Force......................................................................................................................................................8
Spring Surge ..........................................................................................................................................................8
Crankshaft Torsional Dampers ...............................................................................................................................8
Spring Dampers .....................................................................................................................................................8
Constant Rate Springs...........................................................................................................................................8
Variable Rate Springs ............................................................................................................................................8
Barrel Wound Springs............................................................................................................................................9
Multiple Springs......................................................................................................................................................9
