Differences

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--- techtalk:evo:engmech02a [2018/08/19 17:46]
hippysmack [Inspect the Pinion Gear Mark and Keyway Slot]
+++ techtalk:evo:engmech02a [2020/10/25 00:38]
ixl2relax [Cam Timing Mark Identification]
@@ Line 1: / Line 1: @@
 [[:techtalk:menu|{{  :techtalk:gototechnicalmenu.jpg|}}]]
 ====== EVO: Engine Mechanicals - Sub-02A ======
-====== Installing Evo Cams ======
+====== Installing Evo Cams (91 and Up) ======
-==== Positioning the Pinion Gear ====
+===== Positioning the Pinion Gear =====
   * To rotate the engine to correctly position the pinion gear, either:
@@ Line 24: / Line 24: @@
-==== Installing the Cams ====
+===== Installing the Cams =====
-=== Checklist ===
+==== Checklist ====
   * Read the Service Manual prior to performing any work! ((Turbota of the XLFORUM http://xlforum.net/forums/showthread.php?t=31258))
@@ Line 37: / Line 37: @@
 {{:techtalk:evo:engmech:gearcase_cam_location_by_phillober.jpg?direct&400|}} Cam hole identification in the gearcase: ((photo by Phillober, annotated by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=1122547&page=6)) \\
-=== Cam Identification ===
+==== Cam Timing Mark Identification ====
 **Note**: If your cams have “V” markings on them, disregard those markings. The “V” markings on the cams are not used for timing Sportsters. ((Turbota of the XLFORUM http://xlforum.net/forums/showthread.php?t=26379)) {{:techtalk:evo:engmech:cam_markings_by_bsaman.jpg?direct&400|}} ((photo by bsaman of the XLFORUM http://xlforum.net/forums/showthread.php?t=693559&page=2)) {{:techtalk:evo:engmech:cam_timing_by_austinxl.jpg?direct&400|}} ((photo by AustinXL of the XLFORUM http://xlforum.net/forums/showthread.php?t=1701132))
+Here's a Buell Blast (single cylinder) using the 'V' timing marks on the cams. ((photo by soulhamster of the XLFORUM http://xlforum.net/forums/showthread.php?t=1321505&page=3)) \\
+{{:techtalk:evo:engmech:buell_v_mark_on_cams_by_soulhamster.jpg?direct&500|}}
 ==== Working Around the Lifters If Installed ====
@@ Line 57: / Line 59: @@
 |{{:techtalk:evo:engmech:installing_evo_cams_2_by_phillober.jpg?direct&300|}}|{{:techtalk:evo:engmech:installing_evo_cams_3_by_phillober.jpg?direct&300|}}|{{:techtalk:evo:engmech:installing_evo_cams_4_by_phillober.jpg?direct&300|}}|
-==== Timing The Cams ====
+===== Timing The Cams =====
-=== Piston Position (TDC) Has Nothing To Do With Cam Installation or Timing ===
+==== Piston Position (TDC) Has Nothing To Do With Cam Installation or Timing ====
 The mark on the pinion gear has to be pointing to the center of the #2 cam. \\
@@ Line 79: / Line 81: @@
 All you have to do is line up the dots on the gears. ((steelworker of the XLFORUM http://xlforum.net/forums/showthread.php?t=695947&page=3))
-=== Checklist ===
+==== Checklist ====
   * **Caution**: \\ The dots on the cams correspond to the cam lobe positioning in relation to the crankshaft, pistons and valves. \\ Cam lobes open / close the valves at the proper 'time' and in relation to the rise and fall of the pistons. \\ All dots must line up properly. \\ Incorrect cam timing can result in engine damage from the valves opening / closing out of sync. \\ [[techtalk:evo:engmech02a#damage_pics_from_incorrect_cam_timing|Some damage pics from this can be seen below.]]
@@ Line 86: / Line 88: @@
   * The notch on the pinion gear tooth can be difficult to make out. It's just a small slot cut long-ways on one tooth face. \\ You may need to clean the pinion gear teeth enough to be able to clearly tell the difference. \\ [[techtalk:evo:engmech02a#positioning_the_pinion_gear|See pics of the pinion mark by itself above.]]
-=== Cam Placement and Arrangement ===
+==== Cam Placement and Arrangement ====
@@ Line 94: / Line 96: @@
 |**#1** cam dot faces the center of the #2 cam bore|**#3** has two dots. Each dot faces toward the center \\ of the two adjacent cam bores (#2 and #4 respectively). \\ The dots won't line up correctly installed upside down.|
 |{{:techtalk:evo:engmech:installing_evo_cams_5_by_phillober.jpg?direct&400|}}|{{:techtalk:evo:engmech:installing_evo_cams_6_by_phillober.jpg?direct&400|}}|
+| 86-90 cam alignment ((photo by iwntobliku of the XLFORUM http://xlforum.net/forums/showthread.php?t=50047))|
+|{{:techtalk:evo:engmech:89_cams_lined_up_by_iwntobliku.jpg?direct&400|}}|
   * #4 cam can be installed at any time after #3 is in place and it's the least of the worries of installing incorrectly (outside of checking that the cam number is correct).
@@ Line 103: / Line 108: @@
 |{{:techtalk:evo:engmech:installing_evo_cams_7_by_phillober.jpg?direct&400|}}|{{:techtalk:evo:engmech:installing_evo_cams_8_by_phillober.jpg?direct&400|}}|
-=== The Exact Position of the Timing Marks May Have To Be Interpreted ===
+==== The Exact Position of the Timing Marks May Have To Be Interpreted ====
   * Sometimes, the cam marks leave room for interpretation as in don't quite line up dead bang. \\ The root cause of the problem is the clearance between the camshafts and their respective bushings. \\ Without the cover in place, the cams hang down some. \\ Some hang down more than others because they have less support. \\ It's particularly bad on the #1 cam, as pictured, because the #1 cam sags down and the #2 cam doesn't (it's supported by the pinion gear). \\ And, you're relying on a mark on the #1 cam that's not directly on the teeth. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=693559))
+  * If it's advanced a tooth, you'll lose power by opening the exhaust too early, essentially dumping power right out the exhaust before it's done pushing on the piston. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=693559&page=3)) You may even make your pipes glow red. You'll also lose a lot of overlap, meaning you'll lose exhaust augmentation of intake flow, again costing power.
+  * If it's retarded a tooth, you'll likely get valve to piston contact. The piston chases the exhaust valve closed, and if the valve is that late getting closed, the piston will likely catch it. If you're using cams with very little overlap to begin with, say "D" cams, you might get away with it, but with most any performance oriented grind, you don't have that much margin.
 {{:techtalk:evo:engmech:cam_alignment_by_hippysmack.jpg?direct&400|}} ((photo by Hippysmack)) {{:techtalk:evo:engmech:cam_timing_2_by_austinxl.jpg?direct&400|}} ((photo by AustinXL of the XLFORUM http://xlforum.net/forums/showthread.php?t=1701132))
@@ Line 117: / Line 124: @@
     - Cam #2 to cam #3.
-==== Before Installing the Cam Cover ====
+**Another consideration**:
+The position of the mark on the pinion gear to line up #2 cam is straight across from the slot in the back of the gear. \\
+This slot can be widened with wear and not line up perfectly with the keyway on the pinion shaft. \\
+The key is actually what #2 cam should line up with. \\
+So if the pinion gear is off a little from the woodruff key location, the cams can appear not to line up perfectly together (even though they are). \\
+So while lining up the pinion gear and #2 cam, there may be a fudge factor there also to consider when the dots aren't lined up perfectly. \\
+You can see that the pinion gear is installed to the right of the center of the slot in the third pic below. \\
+{{:techtalk:evo:engmech:pinion_gear_keyway_clearance_by_grind_-_labeled_by_hippysmack.jpg?direct&300|}} ((photo by ~Grind~ of the XLFORUM, labeled by Hippysmack http://xlforum.net/forums/showthread.php?t=1448694)) \\
+|  Be in mind of the woodruff key location in the pinion gear slot. ((photos by ~Grind~ of the XLFORUM http://xlforum.net/forums/showthread.php?t=1448694))  |||
+|{{:techtalk:evo:engmech:pinion_gear_alignment_on_woodruff_key_1_by_grind.jpg?direct&300|}}|{{:techtalk:evo:engmech:pinion_gear_alignment_on_woodruff_key_2_by_grind.jpg?direct&300|}}|{{:techtalk:evo:engmech:pinion_gear_alignment_on_woodruff_key_3_by_grind.jpg?direct&300|}}|
+===== Before Installing the Cam Cover =====
 |Lube the cover bushings and the cam gears and shafts. ((photos by Phillober of the XLFORUM http://xlforum.net/forums/showthread.php?t=1122547&page=7))||
 |{{:techtalk:evo:engmech:installing_evo_cams_12_by_phillober.jpg?direct&400|}}|{{:techtalk:evo:engmech:installing_evo_cams_13_by_phillober.jpg?direct&400|}}|
-==== Damage Pics From Incorrect Cam Timing ====
+|Some like more than others but the more lube, the better. \\ Just be sure not to put thick lube in the pinion shaft hole and block the oil path. ((photo by chris_b_owens of the XLFORUM http://xlforum.net/forums/showthread.php?t=1843303&page=4))||
+|{{:techtalk:evo:engmech:cam_gears_installed_1_by_chris_b_owens.jpg?direct&400|}}|{{:techtalk:evo:engmech:cam_gears_installed_2_by_chris_b_owens.jpg?direct&400|}}|
+===== Damage Pics From Incorrect Cam Timing =====
 |All dots on the cams are correct but the pinion gear and #2 cam marks were out of alignment. ((photos by groovemeisterus of the XLFORUM http://xlforum.net/forums/showthread.php?t=322680&page=6))||Resulting in bent intake pushrods and valves ((photo by groovemeisterus of the XLFORUM http://xlforum.net/forums/showthread.php?t=322680&page=4))|
@@ Line 128: / Line 150: @@
-==== Some useful links on cam installation ====
+===== Some useful links on cam installation =====
   * [[http://www.hammerperf.com/ttxlcaminstall.shtml|Installing XL Cams]] from Hammer Performance. AKA, more than you ever wanted to know about installing cams in an XL. (aswracing)
   * [[http://www.nrhsperformance.com/tech_xlcaminstall.shtml|XL Camshaft Installation]] from NRHS Performance
+  * [[http://xlforum.net/forums/showthread.php?t=171329&highlight=wanted+cams|XLFORUM thread on cam specs]].

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