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techtalk:evo:engmech02 [2025/05/29 14:05] – [Pinion Gear] bplinsontechtalk:evo:engmech02 [2025/09/16 17:59] (current) – [1991-Up Lifters] hippysmack
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 ====== EVO: Engine Mechanicals ====== ====== EVO: Engine Mechanicals ======
 +====== Camshafts ======
 +==== Sub Documents ====
  
-The Camshafts (4 of them) are used to operate the intake and exhaust valves by means of the lifters (AKA: tappets), the pushrods and the rocker arms. The #2 Cam is driven by the Pinion Gear. The Pinion Gear is mounted on the Pinion Shaft which is part of the Flywheel Assembly.+  * [[techtalk:evo:engmech02e|Cam Grind Comparisons]]
  
-#1 Cam - Rotates CW -- Operates Rear Exhaust Valve\\ 
-#2 Cam - Rotates CCW - Operates Rear Intake Valve - Driven by Pinion Gear\\ 
-#3 Cam - Rotates CW -- Operates Front Intake Valve\\ 
-#4 Cam - Rotates CCW - Operates Front Exhaust Valve\\ 
  
-====== Camshafts ======+The Camshafts (4 of them) are used to operate the intake and exhaust valves by means of the lifters (AKA: tappets), the pushrods and the rocker arms. The #2 Cam is driven by the Pinion Gear. The Pinion Gear is mounted on the Pinion Shaft which is part of the Flywheel Assembly. 
 +  * #1 Cam - Rotates CW -- Operates Rear Exhaust Valve 
 +  * #2 Cam - Rotates CCW - Operates Rear Intake Valve - Driven by Pinion Gear 
 +  * #3 Cam - Rotates CW -- Operates Front Intake Valve 
 +  * #4 Cam - Rotates CCW - Operates Front Exhaust Valve 
 + 
 +===== Cam Oiling =====
 The cams get oiled by drainage from the rocker boxes and splash oil in the bottom end. \\ The cams get oiled by drainage from the rocker boxes and splash oil in the bottom end. \\
 Oil flows off the pushrod side of the rocker boxes through the pushrod covers, into vertical holes in the lifter bores and into the gearcase. \\ Oil flows off the pushrod side of the rocker boxes through the pushrod covers, into vertical holes in the lifter bores and into the gearcase. \\
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 |{{:techtalk:evo:oil:cam_alignment_by_aswracing.jpg?direct&300|}}|{{:techtalk:evo:oil:lifter_oiling_by_aswracing.jpg?direct&300|}}| |{{:techtalk:evo:oil:cam_alignment_by_aswracing.jpg?direct&300|}}|{{:techtalk:evo:oil:lifter_oiling_by_aswracing.jpg?direct&300|}}|
  
-====== 1986-1990 models ======+====== 1986-1990 Lifters ====== 
 +These year motors have off-center lifters. If you run a straight line through the center of the lifter, it does not go through the center of the cam. It's offset to one side, to give the lobe a better angle of attack when raising the lifter. \\ 
 There was a running change in 1986 to new style hydraulic lifters as opposed to the original 1986 versions for Sportsters. ((1986-1990 HD Sportster FSM pg 3-44)) \\ There was a running change in 1986 to new style hydraulic lifters as opposed to the original 1986 versions for Sportsters. ((1986-1990 HD Sportster FSM pg 3-44)) \\
 They were the same as those used in 1340cc engines beginning in the 1986 model year. The change was to allow for one component to service the entire product line. \\ They were the same as those used in 1340cc engines beginning in the 1986 model year. The change was to allow for one component to service the entire product line. \\
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 {{:techtalk:evo:engmech:86_engine_8_by_xtremraptor.jpg?direct&300|}} ((photo by xtremraptor of the XLFORUM)) {{:techtalk:evo:engmech:86_engine_4_by_xtremraptor.jpg?direct&300|}} ((photo by xtremraptor of the XLFORUM)) \\ {{:techtalk:evo:engmech:86_engine_8_by_xtremraptor.jpg?direct&300|}} ((photo by xtremraptor of the XLFORUM)) {{:techtalk:evo:engmech:86_engine_4_by_xtremraptor.jpg?direct&300|}} ((photo by xtremraptor of the XLFORUM)) \\
  
-====== 91-99 Lifters ======+====== 1991-Up Lifters ====== 
 +1991-up motors have on-center lifters. In other words, it's a straight line through the center of the lifter to the center of the cam underneath it. \\ 
 + 
 +===== 1991-1999 Lifters =====
 1991-1999 engines have AMC-Mopar style lifters (.903" diameter). (("A 4 liter V8 eater" of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/148387-100-ci-s-s-cases?t=1611832)) \\  1991-1999 engines have AMC-Mopar style lifters (.903" diameter). (("A 4 liter V8 eater" of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/148387-100-ci-s-s-cases?t=1611832)) \\ 
  
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 |{{:techtalk:evo:oil:inlet_hole_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:hole_toward_the_crankcase_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:hole_toward_the_crankcase_2_by_hippysmack.jpg?direct&300|}}| |{{:techtalk:evo:oil:inlet_hole_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:hole_toward_the_crankcase_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:hole_toward_the_crankcase_2_by_hippysmack.jpg?direct&300|}}|
  
-===== 91-99 Anti-Rotation Pins =====+==== 1991-1999 Anti-Rotation Pins ====
 **Parts**: \\ **Parts**: \\
 4 - screws (884) \\ 4 - screws (884) \\
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 |{{:techtalk:evo:engmech:91-99_anti-rotation_pins_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:91-99_anti-rotation_pins_5_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:91-99_anti-rotation_pins_6_by_hippysmack.jpg?direct&300|}}| |{{:techtalk:evo:engmech:91-99_anti-rotation_pins_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:91-99_anti-rotation_pins_5_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:91-99_anti-rotation_pins_6_by_hippysmack.jpg?direct&300|}}|
  
-====== 2000 and Up Lifters ======+===== 2000 and Up Lifters =====
 2000 and up have GM/twin cam style lifters (.842" diameter). ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/148387-100-ci-s-s-cases?t=1611832)) \\ 2000 and up have GM/twin cam style lifters (.842" diameter). ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/148387-100-ci-s-s-cases?t=1611832)) \\
  
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 |{{:techtalk:evo:oil:2002_cam_chest_by_scuba10jdl.jpg?direct&300|}}|{{:techtalk:evo:oil:inside_right_case_by_meherdad_it.jpg?direct&300|}}| |{{:techtalk:evo:oil:2002_cam_chest_by_scuba10jdl.jpg?direct&300|}}|{{:techtalk:evo:oil:inside_right_case_by_meherdad_it.jpg?direct&300|}}|
  
-===== 00-05 Lifter Ant-Rotation Screws =====+==== 2000-2005 Lifter Ant-Rotation Screws ====
 **Parts**: \\ **Parts**: \\
 4 - anti-rotation screws (18532) \\ 4 - anti-rotation screws (18532) \\
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 |{{:techtalk:evo:oil:05_tappet_screws_1_by_johnk.jpg?direct&300|}}|{{:techtalk:evo:oil:05_tappet_screws_2_by_johnk.jpg?direct&300|}}| |{{:techtalk:evo:oil:05_tappet_screws_1_by_johnk.jpg?direct&300|}}|{{:techtalk:evo:oil:05_tappet_screws_2_by_johnk.jpg?direct&300|}}|
  
-===== 06-Up Anti-Rotation Device =====+==== 2006-Up Anti-Rotation Device ====
 **Parts**: \\ **Parts**: \\
 2 - Anti Rotation Device blocks (18505-06) \\ 2 - Anti Rotation Device blocks (18505-06) \\

Trace: • REF: Engine Control - Sub-50B • EVO: Engine Mechanicals • IH: Engine Mechanicals - Sub-01B