From Acura press: The 1990 Acura Legend luxury performance automobiles continue the Acura tradition of innovative design, advanced technology and precision engineering.
For 1990 the Acura Legend is available in four-door Sedan and two-door Coupe body configurations. Both feature aerodynamic styling and low coefficient of drag (Cd) figures -- 0.32 for Sedan, 0.30 for Coupe. Design elements contributing to Legend's aerodynamic efficiency include a low, tapered hoodline, narrow flush-mounted halogen headlights, sharply sloped windshield and rear glass angles and high rear deck.
The smooth body surface includes nearly flush windows, flush door handles and taillights, and aerodynamically-shaped side mirrors that are flared into the leading edges of the doors. The Legend's flared fenders are smoothly contoured into the wheel housings and the front and rear bumpers are integrated into the body.
Advanced design, first pioneered in Honda's Formula 1 engine program, was employed in the development of the Legend's lightweight aluminum alloy 2.7-liter 24-valve, SOHC fuel-injected V-6 engine. It utilizes a 90 degree cylinder bank design and innovative single-overhead camshaft, making the engine extremely compact -- which allows in part for the Legend's low, aerodynamic hoodline.
Among the numerous advanced engine systems are a pent-roof combustion chamber, which permits a symmetrical four-valve layout and central spark plug location, equal length crossflow exhaust and intake ports, variable intake control manifold and programmed fuel injection.
The Variable Intake Control System combines mechanical precision with electronic control. At low engine speeds, air passes through long (630mm) but relatively narrow (in cross section) rectangular ports. Their shape and dimensions create high intake air velocity and inertia, which increases volumetric efficiency and produces more torque for improved acceleration.
As engine speed increases, the engine's Electronic Control Unit (ECU) directs a solenoid actuator which opens six individual butterfly valves that allow air into short (420mm), oval, funnel-shaped ports - passing a greater volume of air into the combustion chambers. The transition from one set of ports to the other assures smooth power delivery throughout the full rpm range. Low to mid-range engine response is improved without sacrificing high end power. Torque is rated at 162 lbs-ft at 4500 rpm.
A sophisticated computer-controlled sequential fuel injection system helps develop the maximum engine power rating of 161 horsepower at 5900 rpm. An eight-bit microcomputer analyzes information from seven sensors (which monitor throttle angle, crankshaft angle, coolant temperature, manifold air pressure, atmospheric pressure and exhaust gas oxygen content) and uses the input to maintain the proportion of fuel and air within the ideal range. The ignition system is fully electronic.