Exhaust manifold for four-cylinder engine
First Claim
1. An engine comprising:
- four cylinders;
an exhaust manifold mounted to a cylinder head of the engine; and
four exhaust manifold branches included in the exhaust manifold and arranged to each cylinder, wherein two exhaust manifold branches of two cylinders that are not fired in succession are convergent at a convergence angle equal to or below 20 degrees to form a first convergent exhaust manifold branch, two exhaust manifold branches of another two cylinders that are not fired in succession are convergent at a convergence angle equal to or below 20 degrees branch to form a second convergent exhaust manifold branch, and the first convergent manifold e second convergent exhaust manifold branch are thereafter made convergent.
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Accused Products
Abstract
In an exhaust manifold of a four-cylinder engine four cylinders of which line up in order of cylinder #1, cylinder #2, cylinder #3 and 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 #1 and an exhaust manifold branch of cylinder #4 in outward sides of the engine that are not fired in succession are made convergent with its convergence angle θ1 being equal to or below 20 degrees to form a first convergent exhaust manifold branch and an exhaust manifold branch of cylinder #2 and an exhaust manifold branch of cylinder #3 between the cylinder #1 and cylinder #4 that 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 θ3 from 0 degrees to 20 degrees.
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Citations
10 Claims
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1. An engine comprising:
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four cylinders;
an exhaust manifold mounted to a cylinder head of the engine; and
four exhaust manifold branches included in the exhaust manifold and arranged to each cylinder, wherein two exhaust manifold branches of two cylinders that are not fired in succession are convergent at a convergence angle equal to or below 20 degrees to form a first convergent exhaust manifold branch, two exhaust manifold branches of another two cylinders that are not fired in succession are convergent at a convergence angle equal to or below 20 degrees branch to form a second convergent exhaust manifold branch, and the first convergent manifold e second convergent exhaust manifold branch are thereafter made convergent. - View Dependent Claims (2, 3, 4, 9)
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5. An engine comprising:
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four cylinders that line up in order of cylinder #1, cylinder #2, cylinder #3, and cylinder #4;
an exhaust manifold mounted to a cylinder head of the engine; and
four exhaust manifold branches included in the exhaust manifold and arranged to each cylinder, wherein the four cylinders are fired in order of cylinder #1, cylinder #3, cylinder #4, and cylinder #2, two exhaust manifold branches of the cylinder #1 and the cylinder #4 are convergent to form a first convergent exhaust manifold branch, two exhaust manifold branches of the cylinder #2 and the cylinder #3 are convergent to form a second convergent exhaust manifold branch, the first convergent exhaust manifold branch and the second convergent exhaust manifold branch are thereafter made convergent, and a convergence position of the second convergent exhaust manifold branch is placed upstream of a convergence position of the first convergent exhaust manifold branch. - View Dependent Claims (6, 7, 8, 10)
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Specification