Someone at Honda must have forgotten that the company has already used the Integra name, as Honda Motor Co. has released details on its new mid-sized motorcycle motor. A two-cylinder 700cc four-stroke lump, the Integra motor promises to be a class leader in fuel-economy for the Japanese brand.
Boasting 40% greater fuel efficiency from other “sport” motors in the 500cc-700cc class, the Integra motor can do 63 mpg (US) according to our rough calculations of Honda’s consumption figure of 27km/L. Perhaps more interesting than its fuel economy, Honda has also stated that the new motor can be coupled to the company’s second generation dual-clutch transmission, the first generation of which can be seen on the Honda VFR1200F.
Honda plans on having the Integra motor showcased on three different concept motorcycles, which will debut at the 2011 EICMA show in Milan, Italy later this year. One of those models will surely be along the same vein as the Mid Concept scooter we saw last year, as that bike is nearly ready for production.
While we don’t know very much more about these concepts, we do know that the Integra motor is designed to be mounted with a 62º forward lean on the cylinder heads, making it lean very far forward — nearly parallel to the road. Expect to see both a DCT variation and a six-speed manual transmission configuration of the Integra at EICMA.
Main Features of the Honda Integra Motorcycle Motor:
Higher combustion efficiency and lower friction
- A wide variety of low friction technologies that aid better fuel economy are incorporated: To improve fuel efficiency through better-controlled combustion while realizing a powerful ride in the low- to mid-rpm ranges, the bore-stroke ratio is set at 73×80mm. An ideal combustion chamber shape and optimum valve timing also contribute to achieve stable combustion. Resin coating is applied to the pistons, and lightweight aluminum material is employed for the first time in a motorcycle in the friction-reducing roller rocker arm.
Uneven-interval firing and uniaxial primary balancer
- Adoption of uneven-interval firing with a 270° phase crank and uniaxial primary balancer help realize an engine with a pleasant throbbing feel that also reduces vibration.
Branch intake port inside the cylinder head, valve timing
- The layout of a branch intake port inside the cylinder head was chosen to have only one intake channel for two cylinders. This design creates deliberate interference between the two cylinders’ intake processes to achieve precisely calculated changes to combustion timing. In addition, to change the valve timing between the two in-line cylinders with one camshaft, the specifications provide for a cam with two timing routines for the intake valve. Through these measures, subtle combustion changes can be generated to give the engine a delightful, pulsating feel.
Exhaust emission purification system
- To maximize the efficiency of exhaust emission purification so that the catalyzer, a three-way catalyst, can be started promptly after the engine starts, the catalyzer has been placed directly beneath the exhaust ports. This design lets the combustion gas pass through the catalyst while the gas is still hot. In addition, a combination of measures, including the adoption of an electronically-controlled fuel injection system (PGM-FI), allows the engine to achieve an emission level approximately half the European emission standards (Euro 3). The resulting environmental performance is ranked among the top in the world without compromising powerful, smooth output.
Second-generation Dual Clutch Transmission
- The Dual Clutch Transmission, developed for the first time by Honda for motorcycles and installed on the VFR1200F, is now lighter and more compact through a simplified hydraulic circuit and other design enhancements. A learning function has been added to each selected running mode to detect a variety of riding environments from city streets to mountain passes and automatically performs the most suitable shift control. Although it is an automatic transmission, the Dual Clutch Transmission delivers fuel economy on a par with manual transmissions as a result of its excellent transmission efficiency.