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The design and orientation of the intake manifold is a major factor in the volumetric efficiency of an engine. Abrupt contour changes provoke pressure drops, resulting in less air (and/or fuel) entering the combustion chamber; high-performance manifolds have smooth contours and gradual transitions between adjacent segments.
Fiat – Controlled High Turbulence (1989–92, Fiat Croma CHT), StarJet engine, dubbed Port Deactivation (PDA), Variable Intake System on the 131HP 1.8 16V and on the 155 HP 2.0 20V Pratola Serra engine. Ford — Dual-Stage Intake (DSI), on their Duratec 2.5 and 3.0-litre V6s, and it was also found on the Yamaha V6 in the Taurus SHO.
Toyota Variable Induction System, or T-VIS, is a variable intake system designed by Toyota to improve the low-end performance of multi-valve engines. [1]T-VIS is intended to improve the low-end torque of high-performance, four-stroke internal combustion engines - by changing the geometry of the intake manifold according to the engine rotation speed.
With low-rise, medium-rise, high-rise, tunnel-port, or SOHC intake manifolds. The low-rise intake, designed to fit under a low hoodline, was the first. The high-rise intake required a hood bubble for clearance. While the low- and medium-rise heads could be used in combination with either low- or medium-rise intakes, the high-rise head required ...
The SHO V6 was a high-tech and revolutionary design when it debuted in 1988. Displacing 3.0 L; 182.2 cu in (2,986 cc), it was an iron block, aluminum head 24-valve DOHC engine with an innovative variable length intake manifold.
Ram-air systems are used on high-performance vehicles, most often on motorcycles and performance cars. The 1990 Kawasaki Ninja ZX-11 C1 model used a ram-air intake, the very first on any production motorcycle. [2] [3] Ram-air was a feature on some cars in the sixties. It fell out of favor in the seventies, but recently made a comeback.