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| techtalk:evo:engmech02 [2025/09/16 17:49] – [Sub Documents] hippysmack | techtalk:evo:engmech02 [2025/10/01 06:32] (current) – [Comparing OEM and Andrews Cam Grinds] hippysmack | ||
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| ==== Comparing OEM and Andrews Cam Grinds ==== | ==== 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:// | ||
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| + | 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' | ||
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| These figures are from the Sportster Evolution Cams PDF from Andrews Products. ((Page25 - http:// | These figures are from the Sportster Evolution Cams PDF from Andrews Products. ((Page25 - http:// | ||
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| - | ===== Checking Lifter Pre-load ===== | ||
| - | Hydraulic lifters self-adjust over about a .100" range, from .050" preloaded to .150" preloaded. ((aswracing of the XLFORUM https:// | ||
| - | They' | ||
| - | |||
| - | * **Measure at the rocker box how much the lifter will get preloaded at the rocker box**. ((http:// | ||
| - | * 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. | ||
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| - | The lifter plunger should be preloaded between .050 and .150. Make the measurement if you're not sure. \\ | ||
| - | {{: | ||
| ===== Oil feed to lifters ===== | ===== Oil feed to lifters ===== | ||
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| |{{: | |{{: | ||
| - | ====== 1986-1990 | + | ====== 1986-1990 |
| + | 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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| {{: | {{: | ||
| - | ====== | + | ====== |
| + | 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:// | 1991-1999 engines have AMC-Mopar style lifters (.903" diameter). (("A 4 liter V8 eater" of the XLFORUM https:// | ||
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| - | ===== 91-99 Anti-Rotation Pins ===== | + | ==== 1991-1999 Anti-Rotation Pins ==== |
| **Parts**: \\ | **Parts**: \\ | ||
| 4 - screws (884) \\ | 4 - screws (884) \\ | ||
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| |{{: | |{{: | ||
| - | ====== 2000 and Up Lifters | + | ===== 2000 and Up Lifters ===== |
| 2000 and up have GM/twin cam style lifters (.842" diameter). ((aswracing of the XLFORUM https:// | 2000 and up have GM/twin cam style lifters (.842" diameter). ((aswracing of the XLFORUM https:// | ||
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| |{{: | |{{: | ||
| - | ===== 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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| |{{: | |{{: | ||
| - | ===== 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) \\ | ||
