![]() By making thousands of calculations per second the system constantly adjusts the air/fuel ratio to maintain it at the peak of driveability, power, fuel economy and within acceptable exhaust emissions. The system, which is controlled by a microprocessor, meters fuel on the basis of continuous information gathered by the array of engine sensors. The new Vigor engine is fueled by the Honda R&D-engineered PGM-FI sequential port fuel-injection system. This increases the volume of air entering the combustion chamber and also produces an inertia ram-tuning effect for more complete cylinder filling, increasing both horsepower and torque. Above 5000 rpm, however, the engine vacuum opens a butterfly valve, allowing the passage of air through a secondary runner. Below 5000 rpm, the cylinder is fed by the primary runner. Based on technology developed for the NSX and the 1991 Legend, the intake manifold is a dual-stage design to increase both low-end torque and high-end horsepower. This has allowed the engineers to design a manifold with long, tuned intake runners to optimize engine breathing. The Vigor inline 5 engine is tilted to the right, 35 o from vertical. To reduce weight and to improve durability the exhaust system is constructed of seamless stainless steel. In order to achieve packaging efficiency and reduce weight, the valvetrain uses a single overhead camshaft design. The Vigor engine features four valves per cylinder to optimize performance and improve breathing at all points in the power band. It is also lighter than an inline 6 or V-6and in some cases more powerful. It provided ample low-end torque and direct, linear response at all levels of the power band. Since it is only slightly longer than an inline 4, it could easily be packaged in a longitudinal location and leave adequate space for a properly designed double-wishbone suspension. Initial experiments with an inline 5 engine indicated tremendous potential. By tilting the engine 35, the engineers were also able to achieve a low hoodline for maximum visibility and a reduction of frontal area to reduce aerodynamic drag. Also, it allows the use of softer engine mounts which reduce the level of noise and vibration reaching the cabin. It creates an ideal 60/40 weight distribution for excellent handling and turn-in response. The longitudinal arrangement of the powertrain achieves a number of desired goals. An electronically controlled 4-speed automatic is optional. The standard transmission is a 5-speed manual with a rod-activated shifter mechanism. ![]() It produces 176 hp at 6300 rpm and 170 lbs.-ft. The engine of the Vigor is a compact, all-aluminum inline 5-cylinder equipped with a single overhead camshaft, four valves per cylinder, Programmed Fuel Injection and a dual-stage intake manifold.
0 Comments
Leave a Reply. |