Valve overlap
The portion of the operating cycle of a four-stroke-cycle reciprocating engine during which both the intake and exhaust valves are off of their seats at the same time.
Aviation Maintenance Technician Handbook — Powerplant, p. G-30
The portion of the operating cycle of a four-stroke-cycle reciprocating engine during which both the intake and exhaust valves are off of their seats at the same time.
Aviation Maintenance Technician Handbook — Powerplant, p. G-30