Lifters
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(→Flat tappet) |
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===Flat tappet=== | ===Flat tappet=== | ||
| − | Flat tappet lifters are flat on the bottom. | + | Flat tappet lifters are flat on the bottom. They're 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), and resemble a cylinder of steel with a 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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