Posted by Janicholson on September 08, 2011 at 20:37:53 from (67.72.98.45):
In Reply to: JaNicholson... posted by DeltaRed on September 08, 2011 at 20:12:48:
Owen is correct. The primary feature of a "popup" piston (one extending into the combustion chamber) is to raise compression without changing the combustion chamber design, or milling the head. The key factors are producing a design that doesnot hit the combustion chamber edges, or hit the valves during the Overlap moment. (not an issue with slow operating tractor engines, butr way important in auto engines that can (and do crash destructively if the timing belt/gears get out of sync. Swirl and compression turbulance is nice for increasing efficiency of combustion in days before direct injection gas engines now being introduced. Unless a lab is dedicated to high end research into flame travel, and unburned hydrocarbons, the "crater" element would be hard to prove effective in promoting swirl/turbulance. Intake runner, valve angle, and chamber design are vrey much more important in Swirl than dome shape. I hope this helps. Jim
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