Acura NSX 1991 Manual page 977

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This engine is a 2,977 cm (181.6 cu-in) DOHC mid-ship unit having 6 cylinders of 90° —V configuration; it is water cool-
ed and equipped with a center plug type pent roof combustion chamber. It is specified for unleaded fuel and uses a
PGM-FI system. This engine incorporates a new mechanism called Honda Variable Valve Timing and Valve Lift Elec-
tronic Control System (VTEC). This mechanism, the world's first, allows the timing and lift of the intake and exhaust
valves to be changed simultaneously. The engine also includes a new electronically-controlled intake manifold system
that can change the volume of the intake chamber.
PGM-FI system: The PGM-FI system on this model is a sequential multiport fuel injection system.