Small and extremely small turbocharged engines are in great demand. More and more manufacturers are investing in these mini drives – whether for small cars, the compact class or mid-range models. Manufacturers like Honda are thereby demonstrating that small engines can also offer great driving pleasure – while also delivering impressive fuel consumption and low exhaust emissions.
High power density
With its new 61 cubic inch (1.0 liter) unit, Honda is presenting a direct injection gasoline engine with three cylinders and turbocharging that sets itself apart thanks to its extremely high power density. The turbocharging system used is a particularly compact B01 turbocharger with wastegate from BorgWarner. The turbo significantly improves the engine‘s power output, response, fuel efficiency and exhaust emission values. In the Honda Civic, this leads to standard fuel consumption of 49 mpg US (59 mpg UK) and CO2 emissions of just 110 grams per kilometer. The tiny engine powers the Civic from 0-60 mph in around 10 seconds and allows the vehicle to reach a top speed of 126 mph. The maximum torque of 200 Nm is already available from just 1,500 rpm.
Turbo with extras
The BorgWarner turbocharger used displays several special characteristics. It has an NVH-optimized design (noise, vibration, harshness), allows the use of low-viscosity oil and is produced from materials capable of resisting exhaust gas temperatures of up to 950 °C. The low-inertia impeller wheel delivers snappy response from very low revs, reaching a speed of up to 285,000 rpm, and significantly expands the turbocharging system‘s performance range. For optimum control of the exhaust gas stream based on the engine state, the turbo is also equipped with an electrical wastegate actuator, which reduces boost pressure at higher exhaust gas rates.
First global development project
The innovative turbocharging system was created in the first joint global development project undertaken by Honda and BorgWarner. With the goal of providing customers with the best possible support directly on site, BorgWarner‘s Yokohama office in Japan was responsible for providing customer service. It was here that the long-planned prototype shop, equipped with the latest technology, was opened in February 2016. This represents an important milestone for the location, as it allows BorgWarner to assemble turbocharger prototypes directly in Japan for the first time – from initial performance samples through to series maturity – and evaluate them on the basis of endurance tests. The turbocharger for Honda‘s new 61 cubic inch (1.0 liter) engine is produced in Ningbo, China. The small turbocharged gasoline engine will be used in numerous Honda models worldwide.
Impressive: the B01 wastegate turbocharger from BorgWarner generates 127 hp (95 kW) from its tiny 61 cubic inch (1 liter) displacement.
The turbocharger for Honda‘s new 61 cubic inch (1.0 liter) engine is produced in Ningbo, China.
Photos: © BorgWarner