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VTEC-E (economy) was designed to achieve better fuel economy, at the cost of performance. The engine operates in "12-valve mode", where one intake valve per cylinder in the 16-valve engine remains mostly closed to attain lean burn. The lean burn mode gets the air to fuel ratio above the 14.7:1 stoichiometric ratio and thus enables extra fuel ...
Variable valve control systems optimize more power and torque by varying valve opening times and/or duration. Some of these valve control systems optimize performance at low and mid-range engine speeds, while others focus on enhancing only high-rpm power. The MIVEC system provides both of these benefits by controlling valve timing and lift.
The valves are typically operated by a camshaft rotating at half the speed of the crankshaft. It has a series of cams along its length, each designed to open a valve during the appropriate part of an intake or exhaust stroke. A tappet between valve and cam is a contact surface on which the cam slides to open the valve. Many engines use one or ...
The solenoid valve regulates the amount of oil pumped by the cam action to either the valve or a bypass reservoir. When pressurized, the hydraulic line behaves like a solid body and transmits the lift schedule imparted by the intake cam directly to the intake valve. When the solenoid is disengaged, a spring takes over valve actuation duties.
The N73 engine also has variable valve lift (valvetronic), which varied intake valve opening lift from 0.30–9.85 mm (0.01–0.39 in), according to engine speed and load. Each cylinder head has a valvetronic assembly – including a motor, control module and position sensor. [4] The N73 was superseded by the BMW N74, a twin-turbocharged V12 ...
The 360 used the large intake port 340 heads with a smaller intake valve of 1.88 in (48 mm). In 1974, with the introduction of the code E58 4-barrel dual-exhaust version, at 245 hp (183 kW) SAE net, it became the most powerful LA engine with the end of 340 production. Power started dropping from 1975 on as more emission controls were added ...
3rd Strike was an American nu metal band, started by Jim Korthe (vocals), Todd Deguchi (guitar), Erik Carlsson (guitar), PJ McMullan (drums) and Gabe Hammersmith (bass). Their lyrics were primarily based upon the former lives of the group's members. [ 4 ]
VarioCam is an automobile variable valve timing technology developed by Porsche. VarioCam varies the timing of the intake valves by adjusting the tension on the timing chain connecting the intake and exhaust camshafts. VarioCam was first used on the 1992 3.0 L engine in the Porsche 968.