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Development of New 3.5 L V6 Turbocharged Gasoline Engine for New NSX

Article of Honda R&D Technical Review Vol.29 No.2

Summary

The concept for Honda’s new NSX was to balance power performance achieving a high level of dynamic performance with a level of environmental performance meeting the demands of the times. A 3.5 L V6 turbocharged gasoline engine with a new frame was developed to realize this concept. In order to balance high power and high thermal efficiency, combustion was optimized through the use of in-cylinder direct injection and high-tumble ports, and the engine applies a twin turbocharger system featuring independent turbochargers positioned on the left and right banks and a fuel supply system combining in-cylinder direct injection and port injection. The powertrain was reduced in size and weight and given a low center of gravity in order to enhance vehicle dynamic performance. In addition, in response to the higher power of the engine, Fe spray-coated cylinder bores, a dry sump lubrication system, a three-piece water jacket, a swing arm valve train, and reduction chain drive were applied in order to help ensure cooling performance and frame reliability suited to the demands of sports driving.
As a result, the new engine achieves a maximum power of 373 kW (500 HP) and a maximum torque of 550 Nm across a wide range from 2000 rpm to 6000 rpm, in addition to complying with the European Euro6b and US ULEV125 regulations.

Reference

(1) Furumata, S., Kakinuma, T., Tochiki, H.: Development of New 3.5 L V6 Turbocharged Gasoline Direct Injection Engine, SAE Technical Paper, 2016-01-1012, (2016)
(2) Kakinuma, T., Tochiki, H., Furumata, S., Funane, T.: Development of New 3.5 L V6 Turbocharged Gasoline Direct Injection Engine, JSAE Annual Congress Proceedings 2016 autumn, No. 1-125, p. 700-705, (2016) (in Japanese)
(3) Nakano, K., Wada, Y., Jono, M., Narihiro, S.: New In-Line 4-Cylinder Gasoline Direct Injection Turbocharged Downsizing Engine, Honda R&D Technical Review, Vol. 28, No. 1, p. 139-146

Author (organization or company)

Takumi FUNANE(Automobile R&D Center)、Seiji FURUMATA(Automobile R&D Center)、Takashi KAKINUMA(Automobile R&D Center)、Hirokazu TOCHIKI(Automobile R&D Center)

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