Exhaust heated induction air for two-cycle engine
AssigneeBrunswick Corporation
InventorGeorge E. Phillips
Life of this patent
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Abstract
Intake air to the carburetor of a two-cycle engine is preheated by ducting ambient temperature outside air past hot engine surfaces. Preferably, a portion of the intake air duct includes a heat exchanger formed integrally with the outer wall of the engine exhaust manifold. The use of heated intake air enhances idle and low speed operation of the engine by reducing or eliminating fuel puddling and by narrowing the temperature range used for carburetor calibration.
Claims15
In a two-cycle internal combustion engine including an exhaust housing receiving exhaust gases from the engine combustion chamber, an engine crankcase including means for supplying an air-fuel mixture to the combustion chamber, and a combustion air intake in communication with the air-fuel supply means, apparatus for improving engine performance at low speed and/or cool ambient temperatures comprising:
- a. intake air passage means for receiving outside air and directing the same to the combustion air intake;
- b. air heating means in communication with the intake air passage means for heating essentially all of the combustion air supplied to said engine;
- and
- c. first means for selectively directing ambient outside air through the air heating means at low engine speeds to heat the ambient air to a temperature sufficient to substantially eliminate fuel puddling.
Dependencies are inferred from the claim text.