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techtalk:ref:engmech04a [2019/08/05 00:49] hippysmack |
techtalk:ref:engmech04a [2019/11/14 06:14] hippysmack [Dissecting the Hayden KVP38 Crankcase Breather Valve] |
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| - | The parts of the "Background" information in the patent material are shown in italics below. \\ | + | In preamble, the Hayden crankcase breather valve is of good quality. \\ |
| - | Comments on this information is shown in bold below. \\ | + | Most that have tried it are satisfied with it's operation. \\ |
| + | The foregoing is to clarify it's operation as it relates to Sportster engine breathing. \\ | ||
| + | The umbrella valve that it uses is the same umbrella that [[https://www.jamesgaskets.com/product/jgi-26856-89/|James Gaskets sells for all 1991-1999, Evolution® & Sportster® models]]. \\ | ||
| + | For that reason, it doesn't seem to be the umbrella that is the 'improvement' (same umbrella that James sells to many, many Sportsters). \\ | ||
| + | The 'improvements' appear to be machined ramps to and from the umbrella, the spacer and the shimming of the umbrella. \\ | ||
| - | //A crankcase breather valve for ventilation and pressure control within the crankcase of an internal combustion engine in which pistons stroke upwardly and downwardly in a synchronous movement. The valve is inserted into a breather hose which conducts gases into and out of the crankcase. The valve comprises a resilient valve member, preferably an elastomeric umbrella-type seal, spaced above a seal seat and forming a gap there between through which gases may flow either direction during portions of the pistons' stroke cycle. The valve construction permits three operating modes: firstly to permit the egress of positive pressure gas out of the crankcase and through the gap while the pistons stroke downwardly; secondly, to permit the ingress of a small amount of gas back through the gap into the crankcase when the crankcase pressure changes from positive to negative; and thirdly to check further ingress of gas into the crankcase at greater crankcase suctions, developed when the piston's are moving upwardly.// | ||
| + | The segments of the "Background" information in the patent material are shown in italics below. \\ | ||
| + | Comments on this information is shown in bold below. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=39)) \\ | ||
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| + | {{:techtalk:ref:engmech:hayden_breather_valve_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) | ||
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| + | //A crankcase breather valve for ventilation and pressure control within the crankcase of an internal combustion engine in which pistons stroke upwardly and downwardly in a synchronous movement. The valve is inserted into a breather hose which conducts gases into and out of the crankcase. The valve comprises a resilient valve member, preferably an elastomeric umbrella-type seal, spaced above a seal seat and forming a gap there between through which gases may flow either direction during portions of the pistons' stroke cycle. The valve construction permits three operating modes: firstly to permit the egress of positive pressure gas out of the crankcase and through the gap while the pistons stroke downwardly; secondly, to permit the ingress of a small amount of gas back through the gap into the crankcase when the crankcase pressure changes from positive to negative; and thirdly to check further ingress of gas into the crankcase at greater crankcase suctions, developed when the piston's are moving upwardly.// | ||
| **The breather valve has 3 functions**. \\ | **The breather valve has 3 functions**. \\ | ||
