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techtalk:ref:engmech04a [2019/08/05 00:55] hippysmack [Dissecting the Hayden KVP38 Crankcase Breather Valve] |
techtalk:ref:engmech04a [2019/08/05 04:50] 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. \\ |
| + | 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. \\ | ||
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| + | 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)) \\ | Comments on this information is shown in bold below. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=39)) \\ | ||
| - | //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.// | + | {{:techtalk:ref:engmech:hayden_breather_valve_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) |
| + | //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**. \\ | ||
| Line 76: | Line 85: | ||
| The Hayden assembly shims the James umbrella to prevent that movement and to adjust the air gap around it. \\ | The Hayden assembly shims the James umbrella to prevent that movement and to adjust the air gap around it. \\ | ||
| ** | ** | ||
| - | **It's the same umbrella that James sells for all 1991-1999, Evolution® & Sportster® models. https://www.jamesgaskets.com/product/jgi-26856-89/ \\ | ||
| - | 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.** \\ | ||
| //Various modifications are apparent to those skilled in the art. For instance, variances in the materials of manufacture of the valve head will clearly affect the gap used. Further, use of a reed-type valve, spaced above a seal seat and being enclosed within a housing, can be seen to provide an equivalent valve in these instances.// | //Various modifications are apparent to those skilled in the art. For instance, variances in the materials of manufacture of the valve head will clearly affect the gap used. Further, use of a reed-type valve, spaced above a seal seat and being enclosed within a housing, can be seen to provide an equivalent valve in these instances.// | ||
