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techtalk:ref:engmech01q [2019/02/18 04:00] hippysmack [Tappet Flats] |
techtalk:ref:engmech01q [2024/01/14 18:24] hippysmack |
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| ====== Tappet Flats ====== | ====== Tappet Flats ====== | ||
| **This is in consideration of induced noise from the use of high lift cams**. \\ | **This is in consideration of induced noise from the use of high lift cams**. \\ | ||
| - | The factory lifter is up to the job from the point of view of the hydraulics. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1510606&page=2)) \\ | + | The factory lifter is up to the job from the point of view of the hydraulics. ((aswracing of the XLFORUM https://www.xlforum.net/forum/vendors/hammer-performance/139198-well-been-doing-some-thinking-excess-valvetrain-noise/page2?t=1510606&page=2)) \\ |
| However, the factory lifter's weaknesses are lack of available travel and less durable axle bearings. \\ | However, the factory lifter's weaknesses are lack of available travel and less durable axle bearings. \\ | ||
| It's possible to machine the flat longer on a stock lifter. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=341901)) \\ | It's possible to machine the flat longer on a stock lifter. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=341901)) \\ | ||
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| In 2006, they changed the design to a plastic "anti-rotaion-device" or ARD. \\ | In 2006, they changed the design to a plastic "anti-rotaion-device" or ARD. \\ | ||
| - | One thing you need to pay attention to when using high lift cams is the tappet pin clearance. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=322680)) \\ | + | One thing you need to pay attention to when using high lift cams is the tappet pin clearance. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=322680)) ((http://xlforum.net/forums/showthread.php?p=1011178&highlight=lifter+pins#post1011178)) \\ |
| Without enough clearance, the tappet will contact the pin and make a racket. \\ | Without enough clearance, the tappet will contact the pin and make a racket. \\ | ||
| The generally accepted minimum clearance is .060": | The generally accepted minimum clearance is .060": | ||
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| From left to right you can see the retaining clip, pushrod seat, piddle valve, plunger / spring, and lifter body. \\ | From left to right you can see the retaining clip, pushrod seat, piddle valve, plunger / spring, and lifter body. \\ | ||
| - | The way these parts work is both simple and complex. For a better description, see [[techtalk:evo:oil01a#lifter_oiling|how a hydraulic lifter works]] in the Sportsterpedia. \\ | + | The way these parts work is both simple and complex. For a better description, see [[techtalk:evo:oil01#lifter_oiling|how a hydraulic lifter works]] in the Sportsterpedia. \\ |
| The plunger is inserted into the lifter body, where the clearance is .0002" or so. \\ | The plunger is inserted into the lifter body, where the clearance is .0002" or so. \\ | ||
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| High performance lifters are especially helpful as a piece of preventative maintenance when high spring pressures are used. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?s=73d24db8f0756ef41c6215fd92ad0055&p=4726240)) \\ | High performance lifters are especially helpful as a piece of preventative maintenance when high spring pressures are used. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?s=73d24db8f0756ef41c6215fd92ad0055&p=4726240)) \\ | ||
| The longer flats also allow higher lifts. | The longer flats also allow higher lifts. | ||
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| ===== Other Useful Links ===== | ===== Other Useful Links ===== | ||
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| ===== Feuling lifters ===== | ===== Feuling lifters ===== | ||
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| ===== Gaterman Lifters ===== | ===== Gaterman Lifters ===== | ||
| Four different models are available for XL's. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?s=73d24db8f0756ef41c6215fd92ad0055&p=4726240)) \\ | Four different models are available for XL's. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?s=73d24db8f0756ef41c6215fd92ad0055&p=4726240)) \\ | ||
