| 摘要 |
An internal combustion engine 1 includes a supplemental fuel passage 26, 27 which connects the carburetor 9 to the exhaust chest cover (28) Fig. 2 (not shown). A supplemental air inlet having a metering orifice 36 and passage (35) connects to the supplemental fuel passage. The resultant air-fuel mixture is heated before entry into the combustion chamber by passing the mixture through a heating passage 32 directly in front of the exhaust ports 13. When the engine is at idle with a completely closed throttle valve 19, the entire air-fuel supply for the engine is provided through the supplemental fuel and air passages and is heated in the heating passage prior to combustion. At increasingly open throttle, air-fuel is increasingly provided from the conventional primary carburetor output, with the heated air-fuel mixture being supplied in gradually decreasing amounts. <IMAGE> |
