Quote:
Originally Posted by 8cd03gro
Clearance between all of the valvetrain components in an OHV also restricts timing precision at a given rpm, sepcifically higher rpm, in comparison to an OHC configuration. The concentric cam design would be most effective in an SOHC configuration. This would allow for multi-valve(4+) heads, centrally located spark and DI, and dual independent VVT with little added weight as SOHC packaging isn't much larger than OHV.
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mechanical clearance on a hydraulic lifter setup is zero, unless you count the small pocket of oil between the lifter piston and lifter body as clearance. and again there are ways around that.