1. Home
  2. Honda R&D Technical Review Vol.18 N...
  3. Development of 1.8L CNG Engine for ...

Technical Review e-Book: Summary

Development of 1.8L CNG Engine for 2006 CIVIC GX

Article of Honda R&D Technical Review Vol.18 No.2


Honda has developed the 2006 CIVIC GX, a natural gas vehicle that it has been mass-producing since 1998. For this model, Honda has developed and fitted a new Compressed Natural Gas (CNG) engine. This new engine was designed to further enhance power. The increased engine displacement and use of a variable-length air intake manifold have achieved a 15% increase in power. In addition, engine fuel consumption has been reduced by 4% through a combination of a reduction in pumping loss due to the inlet valve delayed closure, and a charging stroke injection that harnesses the properties of gaseous fuel. As a countermeasure for tail pipe emissions, a cylinder head integrated with the exhaust manifold and a close-coupled two-bed catalyst have been used. As a result, the amount of precious metal used was reduced by approximately 30%, and is in compliance with the Advanced Technology Partial-Zero Emission Vehicle (ATP-ZEV) Standards. Despite the increased weight of the larger vehicle design, the CIVIC GX achieved a fuel economy increase of 15% in FTP highway mode, and an equivalent fuel economy in combined mode.


(1) Seko, K., Taga, W., Torii, K., Nakamura, S., Akima, K., Sekiya, N.: Development of 1.8L i-VTEC Gasoline Engine for 2006 Model Year Honda CIVIC, Honda R&D Technical Review, Vol. 18, No. 1, p. 8-15
(2) Seko, K., Hayashi, A., Nakajima, M.: Achievement of Enhanced Fuel Economy via i-VTEC Intake Valve Closure Delay Mechanism, Honda R&D Technical Review, Vol. 18, No. 1, p. 88-93
(3) Toda, T., Matsuki, M., Ohmori, T., Yamamoto, Y.: Development of a 1.7L CNG Engine for the 2001 Civic GX, Honda R&D Technical Review, Vol. 14, No. 1, p. 49-56
(4) Arai, S., Muraishi, T.: HONDA Compressed Natural Gas Vehicle, HONDA R&D Technical Review, Vol. 9, p. 17-24
(5) Watanabe, S., Kono, S., Kurata, M., Koga, H.: Research on Extended Expansion General-Purpose Engine–Theoretical Analysis of Multiple Linkage System and Improvement of Thermal Efficiency–, Honda R&D Technical Review, Vol. 18, No. 1, p. 81-87

Author (organization or company)

Susumu NAKAJIMA(Automobile R&D Center)、Hiroyuki GOTO(Automobile R&D Center)、Osamu WATANABE(Automobile R&D Center)、Toshihide MATSUNAGA(Automobile R&D Center)、Hiroaki NAKASHIMA(Automobile R&D Center)、Masahiro NAKAJIMA (Automobile R&D Center)

We would like to get your opinion on this research paper. (This is only applicable to registered members.)

The readers of this research paper have also selected these research papers.

Downsizing as Evolution of High Thermal Efficiency Gasoline Engine
Article of Honda R&D Technical Review Vol.27 No.2
Development of Induction and Exhaust Systems for Third-Era Honda Formula One Engines
Article of Honda R&D Technical Review F1 Special (The third Era Activities)
Development of 3-stage i-VTEC VCM Engine for CIVIC Hybrid
Article of Honda R&D Technical Review Vol.18 No.2