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The VK engine (formerly known as the ZH) is a V8 piston engine from Nissan. It is an aluminum DOHC 4-valve design. The VK engine was originally based on Nissan's VQ V6 rather than the VH V8 used in previous Q45/Cima models. Changes include: a variable intake manifold, newly designed heads, and a larger drive by wire throttle chamber.
It has sequential fuel injection, two valves per cylinder with self-adjusting hydraulic followers, forged steel connecting rods, one-piece cast camshafts, and a cast aluminum lower intake manifold, with either a cast aluminum or plastic/composite upper intake manifold plenum. Bore and stroke are 91.5 mm × 83 mm (3.60 in × 3.27 in).
Nissan QR25DE Engine. The QR25DE is a 2.5 L (2,488 cc) variant built with cast steel connecting rods, a steel timing chain, counter-rotating balance shafts, and an aluminum intake manifold. The engine bore and stroke is 89 mm × 100 mm (3.50 in × 3.94 in) and a compression ratio ranging from 9.5:1 to 10.5:1 depending on the vehicle.
The VE engine is a 3.0 L (2,960 cc) piston V6 engine from Nissan.It is based on the Nissan VG engine and was only used for the 1992, 1993, and 1994 model years. This engine has an iron block, aluminum cylinder heads with 4 valves per cylinder and dual overhead camshafts, variable valve timing on the intake camshafts, coil-on-plug ignition, and an available variable intake manifold (5-speed only).
The engine displacement remains the same, while the intake manifold and exhaust, air-fuel ratio, ignition timing, VTC and other specs have been optimized for street use. The engine produces maximum power of 257 kW (345 hp; 349 PS) at 7200 rpm, and maximum torque of 397 N⋅m (293 lb⋅ft) at 4800 rpm.
The late model Japanese CA18DETs received 8 port (low port) heads, with butterfly actuated auxiliary ports in the lower intake manifold which corresponded with 8 ports in the head. Below c. 3,800 rpm, only one set (4 ports open, 1 per cylinder) of long, narrow ports would be open, accelerating the intake charge to the cylinder.
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