Hemi Rat
04-16-2004, 03:18 PM
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Hemi Rat Sonny Leonard's 21st Century Chevy Engine
By Jeff Burk
Photography: Jeff Burk
For decades Chevy racers and engine builders have known in their hearts that the venerable Chrysler Hemi combustion chamber design with huge intake and exhaust ports and valves was more efficient, and under most conditions, capable of making more power than the Bow-Tie wedge-design cylinder head.
One of the main reasons the hemispherical design has the capability of making more power is the position of the intake and exhaust valves in the combustion chamber. The valves in a hemi head are opposed exactly 180 degrees, which facilitates better airflow characteristics than a wedge head where the valves configuration are more inline or side-by-side. That valve configuration inherently restricts airflow and, in most cases, results in an engine that makes less than optimum power.
By Jeff Burk
Photography: Jeff Burk
For decades Chevy racers and engine builders have known in their hearts that the venerable Chrysler Hemi combustion chamber design with huge intake and exhaust ports and valves was more efficient, and under most conditions, capable of making more power than the Bow-Tie wedge-design cylinder head.
One of the main reasons the hemispherical design has the capability of making more power is the position of the intake and exhaust valves in the combustion chamber. The valves in a hemi head are opposed exactly 180 degrees, which facilitates better airflow characteristics than a wedge head where the valves configuration are more inline or side-by-side. That valve configuration inherently restricts airflow and, in most cases, results in an engine that makes less than optimum power.
04-16-2004, 03:21 PM
#2
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Join Date: Mar 2004
Posts: 104
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Hemi Rat Sonny Leonard's 21st Century Chevy Engine
By Jeff Burk
Photography: Jeff Burk
For decades Chevy racers and engine builders have known in their hearts that the venerable Chrysler Hemi combustion chamber design with huge intake and exhaust ports and valves was more efficient, and under most conditions, capable of making more power than the Bow-Tie wedge-design cylinder head.
One of the main reasons the hemispherical design has the capability of making more power is the position of the intake and exhaust valves in the combustion chamber. The valves in a hemi head are opposed exactly 180 degrees, which facilitates better airflow characteristics than a wedge head where the valves configuration are more inline or side-by-side. That valve configuration inherently restricts airflow and, in most cases, results in an engine that makes less than optimum power.
By Jeff Burk
Photography: Jeff Burk
For decades Chevy racers and engine builders have known in their hearts that the venerable Chrysler Hemi combustion chamber design with huge intake and exhaust ports and valves was more efficient, and under most conditions, capable of making more power than the Bow-Tie wedge-design cylinder head.
One of the main reasons the hemispherical design has the capability of making more power is the position of the intake and exhaust valves in the combustion chamber. The valves in a hemi head are opposed exactly 180 degrees, which facilitates better airflow characteristics than a wedge head where the valves configuration are more inline or side-by-side. That valve configuration inherently restricts airflow and, in most cases, results in an engine that makes less than optimum power.
04-16-2004, 03:45 PM
#3
Originally Posted by ZL1camaro
Sonny Leonard's 21st Century Chevy Engine
By Jeff Burk
Photography: Jeff Burk
For decades Chevy racers and engine builders have known in their hearts that the venerable Chrysler Hemi combustion chamber design with huge intake and exhaust ports and valves was more efficient, and under most conditions, capable of making more power than the Bow-Tie wedge-design cylinder head.
One of the main reasons the hemispherical design has the capability of making more power is the position of the intake and exhaust valves in the combustion chamber. The valves in a hemi head are opposed exactly 180 degrees, which facilitates better airflow characteristics than a wedge head where the valves configuration are more inline or side-by-side. That valve configuration inherently restricts airflow and, in most cases, results in an engine that makes less than optimum power.
By Jeff Burk
Photography: Jeff Burk
For decades Chevy racers and engine builders have known in their hearts that the venerable Chrysler Hemi combustion chamber design with huge intake and exhaust ports and valves was more efficient, and under most conditions, capable of making more power than the Bow-Tie wedge-design cylinder head.
One of the main reasons the hemispherical design has the capability of making more power is the position of the intake and exhaust valves in the combustion chamber. The valves in a hemi head are opposed exactly 180 degrees, which facilitates better airflow characteristics than a wedge head where the valves configuration are more inline or side-by-side. That valve configuration inherently restricts airflow and, in most cases, results in an engine that makes less than optimum power.
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