Advanced Super Charge System for Small Engines

Paper #:
  • 1999-01-3318

Published:
  • 1999-09-28
Citation:
Fujiwara, S., Norimatsu, N., and Taue, J., "Advanced Super Charge System for Small Engines," SAE Technical Paper 1999-01-3318, 1999, https://doi.org/10.4271/1999-01-3318.
Pages:
8
Abstract:
The specific output of 4-cycle engines are generally smaller than that of 2-cycle engines. Increasing engine speed is one method to improve the specific output, however, it contains some disadvantages in application. Hence, improvement in torque with the 4-cycle engine is desirable. Although torque could be improved by super-charging, it seems difficult to apply existing systems for small displacement engines due to problems of their size and cost.We have, therefore, newly developed a super-charging system named Advanced Crankcase Super Charge (hereinafter referred to as ACSC) using a crankcase as a supercharger. In this study, we made a 50cc single cylinder prototype engine with ACSC and carried out the engine unit tests and actual running tests on a scooter. From these tests, the torque that is twice as that of the naturally aspirated engine was obtained.In addition, the driving performance equivalent to that of the vehicle with 2-cycle engine was achieved in the actual running test. It was also confirmed that the emission level was equivalent to that of a vehicle with a naturally aspirated engine. There was also an improvement in fuel consumption compared to the vehicle with 2-cycle engine.
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