Exhaust manifold for four-cylinder engine

Details Exhaust manifold for four-cylinder engine Exhaust manifold for four-cylinder engine

2005-11-08

2005-11-08

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Common receiver having inlets from plural cylinder

C060S305000, C060S312000, C060S320000, C060S322000

Reexamination Certificate

active

06962049

ABSTRACT:
In an exhaust manifold of a four-cylinder engine four cylinders of which line up in order of cylinder #1,cylinder #2,cylinder #3and cylinder #4,temperature rise performance of a manifold catalyst improves by shortening a total length of the exhaust manifold while preventing exhaust gas interference between the cylinders. Therefore, an exhaust manifold branch of cylinder #1and an exhaust manifold branch of cylinder #4in outward sides of the engine that are not fired in succession are made convergent with its convergence angle θ1being equal to or below 20 degrees to form a first convergent exhaust manifold branch and an exhaust manifold branch of cylinder #2and an exhaust manifold branch of cylinder #3between the cylinder #1and cylinder #4that are not fired in succession are made convergent at a minimum distance having a laterally projected shape to form a second convergent exhaust manifold branch. The first and the second convergent exhaust manifold branches are thereafter convergent at a convergence angle θ3from 0 degrees to 20 degrees.

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