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techtalk:evo:engmech03 [2020/02/25 03:05] hippysmack |
techtalk:evo:engmech03 [2020/10/30 21:33] ixl2relax [Cylinder Pressure Test] |
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| **Results** The difference between the two readings should not be more than 10%. A low reading on either cylinder indicates a possible valve or piston ring issue. To determine which, pour about 1/2 teaspoon of oil into that cylinder through the spark plug hole. Then repeat the compression test. If the reading returns to normal the rings may be defective. If the compression does not increase to within 10% then the valves of that cylinder may require service. | **Results** The difference between the two readings should not be more than 10%. A low reading on either cylinder indicates a possible valve or piston ring issue. To determine which, pour about 1/2 teaspoon of oil into that cylinder through the spark plug hole. Then repeat the compression test. If the reading returns to normal the rings may be defective. If the compression does not increase to within 10% then the valves of that cylinder may require service. | ||
| - | Compression test results vary on stock models but, typical rule-of-thumb is a minimum of 120PSI for 883 engines & 150PSI for 1200 engines. | + | Compression test results vary on stock models but, typical rule-of-thumb is a minimum of 120PSI for 883 engines & 150PSI for 1200 engines, but on 2004+ the 1200 engine minimum should be 180PSI. |
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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)) \\ | ||
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| |{{: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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| ====== Gaskets ====== | ====== 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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| + | \\ | ||
| [[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]] | [[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]] | ||
