1, F20C
F20C Source:
From the last century, the 1980s, Japan has stirred up a wave of high-performance cars, since that time no environmental regulations, there is no collision regulations, oil prices have always remained at low levels, so each Japanese manufacturers can be more pure speed to chase and passion. It is in this special historical background and persistence concept cars, the birth of a leisurely high performance classic cars, but behind every high-performance cars are both hides a restless “heart.” Honda R & D has produced F20C engine on this property, and its performance almost reached the pinnacle of naturally aspirated engine, has become the king of a generation of NA.
Before introducing this engine, let’s talk about carrying the king of this NA models – Honda S2000. Honda S-series models represent the movement and speed, its history dates back to the earliest in 1962, a new concept car S360, this concept car’s displacement of 0.356L, engine at 9000rpm can output 33 horsepower, and unprecedented equipped with a 5-speed manual gearbox. For at that time still in the reconstruction of post-war Japan who, S350 launch motor racing sensation in Japan, but also some old European and American automobile manufacturers by surprise.
Subsequently, Honda’s market to continue to inject S500, S600, and in 1970 discontinued S800, and the 1999 Honda S2000 is the company set up 51 anniversary of the launch of the new S-series coupe. It has passed exactly 29 years from the discontinued S800, after the nearly 30 years of accumulated technology, S2000 models can be said to integrate a variety of Honda’s advanced technology cars. It uses a rear-drive driving mode, on the weight of the vehicle to achieve a perfect 50:50, double-wishbone front, rear multi-link independent suspension which ensures good athletic ability, the most important is it is equipped with a liter of power reached 91.9kW (125 hp) 2.0L naturally aspirated engine.
F20C part of thisTian red top engine in a series in the automotive world, red represents passion and high performance. Honda’s high-performance engine has three series: B, C, H, F can only be considered intermediate level, before F20C no-show, the highest performance undoubtedly F20B, the maximum power of 200Ps, until the ultimate F20C born. It virtue or power Pobai, a high degree of balance and make a little change can break madness million transfer performance, as well as high-load operation for 10 years are still working good life, making it the pinnacle of Honda Red Roof family make, no doubt it is one of the civil naturally aspirated engine performance best.
of the F20C bore and stroke of 87mm and 84.4mm respectively, while using a cylinder rectangular flat design, structurally speaking, is biased high speed power output. F20C compression ratio reached 11: 1, which for more than ten years ago, naturally aspirated engine, it has a very high value. Higher compression ratio to improve the efficiency of the engine, but also to F20C in power and torque outputs are even better.
To increase the power of the engine, the most direct and effective, there are two methods, the first is to increase the displacement of the engine, the second is to increase the engine speed. Of course, each means there will be a corresponding technical problems after reaching a certain extent. Honda chose the second option, which is also its field of expertise, through performance F20C also proved this point. Redline of 8800rpm, up to 9000rpm fuel cut speed, the distance a million go only one step away, 183kW (250 hp) maximum power / 8300rpm and a maximum torque of 217N · m / 7500rpm, and only for one row 2.0L the amount of naturally aspirated engines, really surprising.
F20C tips have such a high engine speed lies weight parts, when the speed reaches 8000 rpm for the engine, the piston in the cylinder bore runs very fast, and because of its own weight will have a great reason for inertia, a large inertia is one of the biggest disadvantage engine speed increase. Thus each member are inside the engine through forging F20CMaking processing, such as pistons and connecting rods. Not only can withstand high temperature and pressure of the working environment, and can effectively reduce the inertial mass, so that into the high speed range F20C breeze.
F20C lightweight member can easily reach it 9000rpm, but another problem is brought about by the high speed dynamic balance, the higher the speed, the balancing problems will become more apparent. F20C highly balanced crankshaft and other high-speed rotating member due to sophisticated manufacturing process, so that weight distribution to achieve a perfect balance. This Honda from the 60s of last century has been involved in F1 race, perhaps not a big problem.
in the intake system, using a 4-cylinder F20C separate throttle body, although relatively complex mechanism but for the provision of high speed when the engine breathe more smoothly played a significant role. Since F20C-valve structure using small angle, so the timing transmission mechanism is also more specific. Crankshaft by a timing chain driven timing pulley rotates, the timing of the back wheel has a gear directly engaged with the intake and exhaust camshafts to drive its operation. By way of gears mesh directly also ensures accurate system timing requirements for high engine speeds.
F20C equipped Honda VTEC technology, namely variable valve timing and lift electronic control system. The system on the intake and exhaust camshafts integrates the two angles of the cam, at low speed, by a common cam to the top of the movable valve, when the engine is in the high speed range, the oil will be located within the valve rocker push cam plunger to perform two conversions, high angle so that the cam will not only open the valve in a working cycle longer, while increasing the lift of the valve, which can effectively ensure a high rotation speed of the engine intake air demand.
F20C VTEC of technology is not infinitely variable, when the engine is 5500rpm or less, but the F20C is a common 2.0 liter naturally aspirated engine, when reaching the operating speed of about 5500rpm VTEC, high angle of the cam will sudden start, so that the
the intake air amount of the engine reaches 5500 rpm before 2.5 times, which makesF20C sudden burst of power should, at the same time driving skills which also put forward higher requirements.
F20C also has its Achilles heel, and for many people, F20C may seem too “extreme” some, complete track of the orientation, too much emphasis on the design of high speed range, so that became a daily driving a kind of torture. Especially at low speeds, a relatively weak torque output can even be an ordinary family cars more relaxed beyond, so it’s a real skill can continue to maintain or to show up at the high speed track in order.
F20C high speed and high compression ratio, making it the Honda engine to be proud of a trump card. And because of its high potential for conversion, but also for many performance enthusiasts have them greater power output of mining. F20C modification to the turbo supercharger from a pressurized, often to different tuners character. In 2007TOPFUEL Tsukuba circuit specially adapted S2000 (F20C), reached 720 records. It is the legend created a naturally aspirated engine of the car, it is also the last paragraph of using DOHCVTEC system inline four-cylinder engine, and it is through successful experiences F20C, the new K20A be born.
Technical parameters
the displacement of
1997 ml
arranged in the form of a cylinder [123 ] inline 4-cylinder
bore
87 mm
stroke
84.4 mm
compression ratio
11: 1
or power
maximum speed
9000rpm
maximum power
183kW (250 hp) / 8300rpm
maximum torque
217N · m / 7500rpm
specific technology
independently of the throttle valve per cylinder, VTEC, dry sump
mounted models
Honda S2000
summary: [123 ] F20C has created a myth naturally aspirated engine, or power its 125 horsepower has rarely surpassed. Of course, it is inseparable from the birth of the specific historical environment, along with stringent emissions regulations have been put forward, rising international oil prices and other factors are high, this high-speed commercial engine hard to believe again. Although not won any awards during its service, but it is difficult to create a brilliant and highly forgotten. Occasionally review by this old generation of products, perhaps also allow us to recognize what mind really want.