What is the placement of the spark plug in an L head combustion chamber?

AI Thread Summary
The discussion centers on the placement of the spark plug in L head combustion chambers, which varies by engine type. L head designs were historically used in aircraft engines but became less common due to advancements in efficiency and cost-effectiveness. The conversation highlights the importance of optimizing power output and fuel economy in engine design. An image of an older engine, likely from a lawnmower, is shared for reference. Understanding spark plug placement is crucial for those studying older combustion chamber designs.
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hey guys ,
i am studying about the old combustion chambers. i came across the L head combustion chamber and am confused about the exact position of the spark plug.so please help me out of this.
 
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it is different for different engines obviously. they used to be used for aircraft engines, until they figured out that there was a much more efficient way to get power out of an engine, and it cost less to get more power per amount of fuel then to worry about the extra amount of money in manufacturing the engine itself. (not to mention, gas mileage is a great thing to improve on for aircraft). here is a picture of an older style, probably small engine (lawnmower?) with the spark plug shown maybe it might help http://html.rincondelvago.com/files/3/3/2/000333322.png
 
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