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techtalk:evo:engmech03 [2019/12/09 17:11] hippysmack [Heads] |
techtalk:evo:engmech03 [2020/06/06 02:27] hippysmack [Pistons & Rods] |
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| |{{:techtalk:evo:engmech:stock88-03xl1200pistonweight_by_aswracing.jpg?direct&200|}}|{{:techtalk:evo:engmech:stock04-upxl1200pistonweight_by_aswracing.jpg?direct&200|}}| | |{{:techtalk:evo:engmech:stock88-03xl1200pistonweight_by_aswracing.jpg?direct&200|}}|{{:techtalk:evo:engmech:stock04-upxl1200pistonweight_by_aswracing.jpg?direct&200|}}| | ||
| ====== Pistons & Rods ====== | ====== Pistons & Rods ====== | ||
| + | |||
| + | The piston pin clips used on all Evolution models changed in color from silver to bronze during the 1992 season. \\ | ||
| + | This was a manufacturing request for visual verification of installation during assembly. \\ | ||
| + | The part number was changed from 22589-83 to 22589-83A. The changed occurred in production approximately in September of 1991. ((HD Tech Tip $TT030 dated July of 1992)) \\ | ||
| + | |||
| |{{:techtalk:evo:engmech:piston_pin_lock_ring_22589-83b_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:piston_pin_lock_ring_22589-83b_by_hippysmack.jpg?direct&300|}}| | ||
| ====== Rocker Arms ====== | ====== Rocker Arms ====== | ||
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| ====== Pushrods ====== | ====== Pushrods ====== | ||
| + | ====== Gaskets ====== | ||
| + | |||
| + | Gasket thicknesses are especially useful when setting squish clearance. ((Tomcatt of the XLFORUM)) \\ | ||
| + | The squish band is the quench area. ((rocketmangb of the XLFORUM http://xlforum.net/forums/showthread.php?t=2075731&page=13)) \\ | ||
| + | The idea is to create turbulence in the chamber which helps the fuel air mix blend and distribute in the chamber. \\ | ||
| + | So the squish is determined by the length of the barrels and the gaskets PLUS the deck height of the cases from crankshaft centerline. \\ | ||
| + | (assuming the rods and pistons are correct) to the cylinder base) \\ | ||
| + | You can buy several different brands / thickness i.e., (.010" and .020" base gaskets) and (.030" and .040") etc. head gaskets to get the desired numbers. \\ | ||
| + | [[techtalk:ref:svcproc26|See more on the squish band here]] in the REF section of the Sportsterpedia. \\ | ||
| + | |||
| + | ===== Base Gasket ===== | ||
| + | 04-up: | ||
| + | Harley base gasket (HD 16789-04) measures .014" in thickness and comes in the top end kit (HD 17049-08). \\ | ||
| + | Cometic has .010" and .020" thick base gaskets. \\ | ||
| + | \\ | ||
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