Lifters
From Crankshaft Coalition Wiki
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| − | [[File:Hydraulic Lifter.jpg|thumb|200px|left|Generic hydraulic lifter]][[File:Schubeck hydraulic lifter made for zero lashing.jpg|thumb|150px|right|[http://www.schubeckracing.com/flathydraulic.html '''Schubeck hydraulic lifter'''] made to be zero-lashed]] <br><br> | + | [[File:Hydraulic Lifter.jpg|thumb|200px|left|Generic hydraulic lifter (c) 2007 ratwell.com]][[File:Schubeck hydraulic lifter made for zero lashing.jpg|thumb|150px|right|[http://www.schubeckracing.com/flathydraulic.html '''Schubeck hydraulic lifter'''] made to be zero-lashed]] <br><br> |
==Overview== | ==Overview== | ||
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===Flat tappet=== | ===Flat tappet=== | ||
| − | Flat tappet lifters are | + | Flat tappet type lifters are actually not perfectly flat, they have a very gradual radius ground onto them to help the lifter to rotate (along with the angle of the cam lobe). Most flat tappet lifters resemble a cylinder of steel with an internal snap ring on one end holding in a pushrod cup. |
Flat tappet cam/lifter valve trains were the primary form of valve actuation for domestic engines from the early '50s until about the mid-'80s. They were reasonable durable and reasonably reliable, although there were better designs. Not until the EPA mandated a change in the motor oil formulations did they fall out of favor. | Flat tappet cam/lifter valve trains were the primary form of valve actuation for domestic engines from the early '50s until about the mid-'80s. They were reasonable durable and reasonably reliable, although there were better designs. Not until the EPA mandated a change in the motor oil formulations did they fall out of favor. | ||
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| + | ====Flat tappet lifter foot==== | ||
| + | The lifter foot of a flat tappet lifter is not perfectly flat, instead it is slightly convex. This is done to allow the lifter to rotate, and the shape of the lifter combined with the shape of the cam lobe is what causes this rotation. The rotation of the lifter keeps the highly loaded interface between the lifter and cam lubricated and cooled so as to not cause excessive wear during operation. | ||
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| + | [[File:Cam lobe angle.jpg|thumb|left|300px|Exaggerated view of flat tappet lifter crown and cam lobe]]<br style="clear:both"/> | ||
====Mushroom flat tappet lifter==== | ====Mushroom flat tappet lifter==== | ||
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{{Note1}}If trying to repair a bad lifter and the lifter's inner bore is OK but the plunger is found to be unrepairable, replace the plunger assembly from another identical lifter and reuse the lifter body, then replace the lifter back on the same lobe it came from. | {{Note1}}If trying to repair a bad lifter and the lifter's inner bore is OK but the plunger is found to be unrepairable, replace the plunger assembly from another identical lifter and reuse the lifter body, then replace the lifter back on the same lobe it came from. | ||
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