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VTEC
VTEC (Variable Valve Timing & Lift Electronic Control) is a system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine, resulting in higher performance at high RPM, and lower fuel consumption at low RPM. The VTEC system uses two (or occasionally three) camshaft profiles and hydraulically selects between profiles. It was invented by Honda engineer Ikuo Kajitani. It is distinctly different from standard VVT (variable valve timing) systems which change only the valve timings and do not change the camshaft profile or valve lift in any way. Context and description Japan levies a tax based on engine displacement, and Japanese auto manufacturers have correspondingly focused their research and development efforts toward improving the performance of their smaller engine designs. One method for increasing performance into a static displacement includes forced induction, as with models such as the Toyota Supra and Nissan 300ZX which used t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honda B Engine
The B-series are a family of inline four-cylinder DOHC automotive engines introduced by Honda in 1988. Sold concurrently with the D-series which were primarily SOHC engines designed for more economical applications, the B-series were a performance option featuring dual overhead cams along with the first application of Honda's VTEC system (available in some models). To identify a Honda B-series engine, the letter B is normally followed by two numbers to designate the displacement of the engine, another letter, and in US-spec engines, another number. The Japanese spec-engines are normally designated with a four character alphanumeric designation. The B-series, the B20B variant in particular, is not to be confused with the earlier Honda B20A engine introduced in 1985 and primarily available in the Prelude and Accord-derived vehicles from 1985 to 1991. While sharing some design elements and both being multivalve Honda four-cylinders, the B-series and B20A differ substantially in archi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3-stage VTEC
Three-stage VTEC is a multi-stage implementation of Honda's VTEC and VTEC-E (colloquially known as dual VTEC) technology, implemented in some of the company's D series engines from 1995 to the present day, allowing the engine to achieve both fuel efficiency and power. VTEC-E (for "Efficiency") is a form of VTEC that closes off one intake valve at low RPMs to give good economy at low power levels, while "VTEC" is a mode that allows for greater power at high RPMs, while giving relatively efficient performance at "normal" operating speeds. "Three-stage VTEC" gives both types in one engine, at the cost of greater complexity and expense. Stage 1 – 12-valve VTEC-E 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 ena ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honda Integra
The , marketed in North America as the Acura Integra, is an automobile produced by the Japanese automobile manufacturer Honda from 1985 until 2006, and then since 2021. It succeeded the Quint as a more luxurious and sport-oriented derivative of the Civic. The Integra was one of the launch models for Acura in the US in 1986 alongside Acura Legend. Throughout its production run, the Integra was highly regarded for its handling and performance. The 1995–2001 Integra Type R is widely regarded as one of the best front-wheel-drive cars of all time. ''Car and Driver'' magazine named the Integra to its annual Ten Best list six times: in 1987, 1988, and 1994 through 1997. The GS-R model was called out specifically in 1994 and 1995. It made a return on the Ten Best list as the Acura RSX, in 2002 and 2003. The Integra nameplate was revived in 2021 after a 16-year hiatus. The Honda Integra nameplate is used for a restyled Honda Civic sedan for the Chinese market, while the Acura Integ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honda CRX
The Honda CR-X (styled in some markets as Honda CRX), originally launched as the Honda Ballade Sports CR-X in Japan, is a front-wheel-drive sport compact car manufactured by Honda from 1983 until 1991. The first generation CRX was marketed in some regions outside Japan as the Honda Civic CRX. Although there are many supposed definitions for the acronym CR-X, the most widely accepted is "Civic Renaissance Experimental". In the U.S., the CRX was marketed as an economy sport Kammback with room for two passengers while Japanese and European market cars came with a 2+2 seating arrangement. Redesigned for the 1988 model year and produced until 1991, the CRX was popular for its performance, nimble handling, and good fuel economy. The CR-X was replaced by Honda's CR-X del Sol and was marketed as a CR-X in some markets. __TOC__ First generation Overview In 1983 for the 1984 model year, Honda introduced an all-new two-seater that shared the drivetrain with the Civic but offered u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable Valve Timing
In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems. There are many ways in which this can be achieved, ranging from mechanical devices to electro-hydraulic and camless systems. Increasingly strict emissions regulations are causing many automotive manufacturers to use VVT systems. Two-stroke engines use a power valve system to get similar results to VVT. Background theory The valves within an internal combustion engine are used to control the flow of the intake and exhaust gases into and out of the combustion chamber. The timing, duration and lift of these valve events has a significant impact on engine performance. Without variable valve timing or variable valve lift, the valve timing is the same for all engine speeds and conditions, therefore compromises are neces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honda K24A Engine 01
is a Japanese Public company, public multinational corporation, multinational Conglomerate (company), conglomerate manufacturer of automobiles, motorcycles, and power equipment, headquartered in Minato, Tokyo, Japan. Honda has been the world's largest motorcycle manufacturer since 1959, reaching a production of 400 million by the end of 2019, as well as the world's largest manufacturer of internal combustion engines measured by volume, producing more than 14 million internal combustion engines each year. Honda became the second-largest Japanese automobile manufacturer in 2001. In 2015, Honda was the eighth largest automobile manufacturer in the world. Honda was the first Japanese automobile manufacturer to release a dedicated luxury brand, Acura, in 1986. Aside from their core automobile and motorcycle businesses, Honda also manufactures garden equipment, marine engines, personal watercraft, power generators, and other products. Since 1986, Honda has been involved with artifi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honda
is a Japanese public multinational conglomerate manufacturer of automobiles, motorcycles, and power equipment, headquartered in Minato, Tokyo, Japan. Honda has been the world's largest motorcycle manufacturer since 1959, reaching a production of 400 million by the end of 2019, as well as the world's largest manufacturer of internal combustion engines measured by volume, producing more than 14 million internal combustion engines each year. Honda became the second-largest Japanese automobile manufacturer in 2001. In 2015, Honda was the eighth largest automobile manufacturer in the world. Honda was the first Japanese automobile manufacturer to release a dedicated luxury brand, Acura, in 1986. Aside from their core automobile and motorcycle businesses, Honda also manufactures garden equipment, marine engines, personal watercraft, power generators, and other products. Since 1986, Honda has been involved with artificial intelligence/robotics research and released their ASIMO rob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honda CBR400
The Honda CBR400 is a Japanese domestic market small-capacity sport motorcycle, part of the CBR series introduced by Honda in 1983. It was the first Honda motorcycle to wear a CBR badge. The CBR400R (NC17) naked bike was launched in December 1983. The 4-valves per cylinder, air-cooled, four-stroke, DOHC, inline-four engine has a rotational-speed valve stop mechanism "REV" (a prototype of Honda's VTEC system) that changed from two valves into four valves at 9,500 rpm. The following two years, it came as semi- and fully faired version as the F3 Endurance. The CBR400R and early CBR400RR models both carry the model number NC23, which makes up the first part of these bikes' frame numbers. In 1986 the CBR400R was also known as Aero, Jellymould, as it shares its major design features with the rest of the early CBR600F and CBR1000F Hurricane family of motorcycles, which include significantly rounded body shapes. Whereas the later 1988 model was designated CBR400RR and was also know ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Overhead Camshaft
An overhead camshaft (OHC) engine is a piston engine where the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion chamber in the engine block. ''Single overhead camshaft'' (SOHC) engines have one camshaft per bank of cylinders. ''Dual overhead camshaft'' (DOHC, also known as "twin-cam".) engines have two camshafts per bank. The first production car to use a DOHC engine was built in 1910. Use of DOHC engines slowly increased from the 1940s, leading to many automobiles by the early 2000s using DOHC engines. Design In an OHC engine, the camshaft is located at the top of the engine, above the combustion chamber. This contrasts the earlier overhead valve engine (OHV) and flathead engine configurations, where the camshaft is located down in the engine block. The valves in both OHC and OHV engines are located above the combustion chamber; however an OHV ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mazda RX-7
The Mazda RX-7 is a front-engine, rear-wheel-drive, rotary engine-powered sports car that was manufactured and marketed by Mazda from 1978 until 2002 across three generations, all of which made use of a compact, lightweight Wankel rotary engine. The first generation of the RX-7, SA (early) and FB (late), was a two-seater 2 door hatchback coupé. It featured a 12A carbureted rotary engine as well as the option for a 13B with electronic fuel injection in later years. The second generation of RX-7, known as the FC, was offered as a 2-seater coupé with a 2+2 option available in some markets, as well as in a convertible bodystyle. This was powered by the 13B rotary engine, offered in naturally aspirated or turbocharged forms. The third generation of the RX-7, known as the FD, was offered a 2+2-seater coupé with a limited run of a 2-seater option. This featured a sequentially turbocharged 13B REW engine. More than 800,000 were manufactured over its lifetime. __TOC__ First gener ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valve Timing
In a piston engine, the valve timing is the precise timing of the opening and closing of the valves. In an internal combustion engine those are usually poppet valves and in a steam engine they are usually slide valves or piston valves. Internal combustion engines Camshaft In four-stroke cycle engines and some two-stroke cycle engines, the valve timing is controlled by the camshaft. It can be varied by modifying the camshaft, or it can be varied during engine operation by variable valve timing. It is also affected by the adjustment of the valve mechanism, and particularly by the tappet clearance. However, this variation is normally unwanted. Valve overlap With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in drawing in the fresh cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valve Timing
In a piston engine, the valve timing is the precise timing of the opening and closing of the valves. In an internal combustion engine those are usually poppet valves and in a steam engine they are usually slide valves or piston valves. Internal combustion engines Camshaft In four-stroke cycle engines and some two-stroke cycle engines, the valve timing is controlled by the camshaft. It can be varied by modifying the camshaft, or it can be varied during engine operation by variable valve timing. It is also affected by the adjustment of the valve mechanism, and particularly by the tappet clearance. However, this variation is normally unwanted. Valve overlap With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in drawing in the fresh cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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