Originally posted by bpt323
Otto cycle is jargon for '4 stroke'.
I'm sure Mike didn't need to seach anything on google either.
solid lifters are a solid bucket which when acted on by the cam, push down on the valve. Hydraulic lifters are a floating system, where oil-pressure pushes up on the lifter, creating a zero-tolorance at all times, and doesn't need adjustment. Solid lifters need to be shimmed to maintain the correct valve lash(the distance between the cam and the lifter), and has to be checker periodically. HLAs are zero-maintainence, but aren't as good for high RPM usage.
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