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With the advance in modularization of engine parts in recent years, there is increased use of plastic-made products in air intake systems. Plastic-made intake manifolds (Fig. 1) provide many advantages including reduced weight, reduced cost, and lower intake air temperatures. However, these manifolds have one disadvantage when compared with conventional aluminum-made intake manifolds, in that they transmit more noise because of their lower material density. For example, plastic intake manifolds of early development often generate flow noise when the throttle is opened quickly. With conventional aluminum intake manifolds, this flow noise had generated, but was not heard. This flow noise is presumed to be generated because of high-speed airflow generated when the throttle is opened quickly, but the mechanism of this noise generation has not been clarified.

This paper covers the application of hybrid vibro-acoustic simulation methods to shorten the design cycle of power-plant components. A comparison is made between Frequency Response Function based and Modal based algorithms for the generation of a predictive powerplant assembly model. The effectiveness of design modifications is evaluated by loading the original and modified predictive models with experimentally identified excitation forces. The procedure is validated by correlation with experimental data.

The fuel economy was sharply improved from our 1976 model rotary engine cars mainly through modifications to the engine and improvements in the reactivity of the thermal reactor system. The progress of our development on these items of improvement and their effects are presented in this paper. Our advance program includes several development items in addition to the above, and the progress of development on these items and their future prospects are also presented.

This report covers the structural features of the 10A engine, which is a production type, 2 rotor, rotary engine designed for automotive use. Among the studies carried out, particular attention was given to problems concerning cracking of the rotor housing, attributable to thermal fatigue. Measures taken to solve this problem are described. Other investigations were directed toward trial application of a die-cast rotor housing with thin chromium plating applied by the transplant coating process; measurements taken of flame propagation within the combustion chamber by using ion gap plugs; and reduction of HC emission by adoption of air injection with a thermal reactor.