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techtalk:ref:engmech01q [2019/02/18 03:34] hippysmack [Jims lifters] |
techtalk:ref:engmech01q [2024/01/14 18:24] hippysmack |
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| ====== Lifter Comparisons ====== | ====== Lifter Comparisons ====== | ||
| ====== 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)) \\ |
| - | A .590 lift cam on a stock base circle will cause the tappet to run into the pin. \\ | + | Without enough clearance, the tappet will contact the pin and make a racket. \\ |
| + | The generally accepted minimum clearance is .060": | ||
| + | (with the cam positioned at full lift, lifter sitting on top of it, use a magnet to pull the lifter up until it stops) \\ | ||
| + | You want it to move .060" at least. \\ | ||
| + | |||
| + | A .590" lift cam on a stock base circle will cause the tappet to run into the pin. \\ | ||
| Maybe not on a roll-through, but almost certainly with the motor warm and running. \\ | Maybe not on a roll-through, but almost certainly with the motor warm and running. \\ | ||
| If you get a lot of valve train noise, check it. Simply unscrew your pins and look for contact marks. \\ | If you get a lot of valve train noise, check it. Simply unscrew your pins and look for contact marks. \\ | ||
| They tend to get a little smiley face impression on them when the tappets are hitting them. \\ | They tend to get a little smiley face impression on them when the tappets are hitting them. \\ | ||
| - | The lifters can hit the pins with less lift than that. JIMS lifters have longer flats on the tappets. \\ | + | The lifters can hit the pins with less lift than that. \\ |
| + | Jims lifters have longer flats on the tappets, but roller failure has been reported while using them. \\ | ||
| |Pin damage from lifter ((photo by groovemeisterus of the XLFORUM http://xlforum.net/forums/showthread.php?t=1647586))|Tappet and pin wear ((photo by groovemeisterus of the XLFORUM http://xlforum.net/forums/showthread.php?page=2&t=1647586))| | |Pin damage from lifter ((photo by groovemeisterus of the XLFORUM http://xlforum.net/forums/showthread.php?t=1647586))|Tappet and pin wear ((photo by groovemeisterus of the XLFORUM http://xlforum.net/forums/showthread.php?page=2&t=1647586))| | ||
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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)) \\ | ||
