Differences

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--- techtalk:evo:engmech02 [2025/09/16 17:54] – [1986-1990 models] hippysmack
+++ techtalk:evo:engmech02 [2025/10/01 06:32] (current) – [Comparing OEM and Andrews Cam Grinds] hippysmack
@@ Line 44: / Line 44: @@
 ==== Comparing OEM and Andrews Cam Grinds ====
+All of the old Andrews grinds ... the N2/N4/N6/N8 ... were all designed around the 03 & older heads, which are a totally different animal from the newer heads. If you notice, every one of those grinds is at .500" lift or less> That's because .500" was the maximum safe lift for the hardware that came in the older heads. ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/161578-cam-selection#post3442028)) \\
+W's actually came out in 1998 on the 1200S models. Then in 2004, all the 1200s got them. Then in 2007, all the 883s got them as well. W cams have a really, really early intake close event. What that does is it builds more cylinder pressure, since more of the compression stroke is used for actual compression. This helps bottom end and mid range a lot. But then at higher rpm's, it chokes the motor. So they're a good grind for low to mid rpm's. ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/161578-cam-selection#post3442028)) \\
 These figures are from the Sportster Evolution Cams PDF from Andrews Products. ((Page25 - http://www.bigboarv-twin.com/wp-content/uploads/2015/07/Andrews-Products-Catalogue-20141.pdf))
@@ Line 198: / Line 202: @@
 \\
-===== Checking Lifter Pre-load =====
-Hydraulic lifters self-adjust over about a .100" range, from .050" preloaded to .150" preloaded. ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/160330-squish-band-clearance?t=1720575)) \\
-They'll actually work outside that range but they might make noise, so it's best to stay in that range. \\
-  * **Measure at the rocker box how much the lifter will get preloaded at the rocker box**. ((http://www.hammerperf.com/ttpushrodlength.shtml))
-    * Put your pushrods in place (remember, the longer one goes on the exhaust).
-    * Set the gasket and rocker box on top, and start the four big screws only.
-    * Finger tighten the left (spark plug) side. \\ (while making sure the right side is resting with the upper pushrod ends sitting in the cups on the rocker arms)
-    * Now take a simple caliper and measure how much gap you have between the rocker box and the rocker box gasket, as shown in the photo below.
-    * This won't be an exact answer, but it'll be pretty close. \\ Remember, you'd like to see the plunger preloaded about .100", but anywhere between .050" and .150" should work. \\ You can order pushrod lengths that are longer or shorter than your stock pushrods by the amount it takes to achieve .100" of lifter plunger preload. \\ If you don't have a caliper to measure your stock pushrod lengths, the information is available in most factory service manuals.
-The lifter plunger should be preloaded between .050 and .150. Make the measurement if you're not sure. \\
-{{:techtalk:evo:engmech:checking_lifter_preload_by_aswracing.jpg?direct&300|}} ((photo by aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/42637-push-rod-length?t=113818)) \\
 ===== Oil feed to lifters =====
@@ Line 245: / Line 236: @@
 {{: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 ======
+-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 =====
 -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)) \\
@@ Line 263: / Line 257: @@
 |{{: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**: \\
 - screws (884) \\
@@ Line 288: / Line 282: @@
 |{{: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 =====
 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)) \\
@@ Line 302: / Line 296: @@
 |{{: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**: \\
 - anti-rotation screws (18532) \\
@@ Line 317: / Line 311: @@
 |{{: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**: \\
 - Anti Rotation Device blocks (18505-06) \\

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