Honda Acura NSX 1991 Service Manual page 47

This engine has the following new features.
l VTEC; High output and a broad power band is achieved through control of low-speed and high-speed valve operation
by the PGM-FI ECU.
(Two knock sensors are used to detect octane level of the fuel.)
high strength is used for the connecting rods.
(Strength is at the same level as iron.)
(Weight is about 30% lighter than iron.)
by switching the chamber volume of the intake manifold according to engine speed. This is electronically controlled.
l Cooling system for the mid-ship engine:
l The cylinder block is highly rigid with deep water jackets.
In order to achieve lighter weight. magnesium.is
l
Cylinder head cover
l
Intake manifold cover
l
Intake manifold chamber
l
Major Specifications
Displacement
Bore x Stroke
Compression Ratio
Cam, Valve Mechanism
Valve Train
Fuel Supply System
aluminum alloy radiator and pipes made of aluminum alloy)
used for the following parts:
Water-cooled V6-90' Cross Flow
2,977 cm3 (181.6 cu.in)
90 x 78 mm (3.54 x 3.07 in)
DOHC (Ccamshafts),
Belt Driven
PGM-FI {Multi-Point Injection)
10.2
VTEC