Air Cooled Cylinder Head Material
Air Cooled Cylinder Head Material
(OP)
What is the best alloy for a cast aircooled OHV cylinder head?
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Air Cooled Cylinder Head Material
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RE: Air Cooled Cylinder Head Material
RE: Air Cooled Cylinder Head Material
RE: Air Cooled Cylinder Head Material
Tmoose is right on target. Seats dropping out of the head is your biggest design worry. The distance (think both material and cooling) between the valve seats is something that you must work to obtain. (0.15" between the seats is a ball park estimate for something with around a 3" bore).
RE: Air Cooled Cylinder Head Material
RE: Air Cooled Cylinder Head Material
RE: Air Cooled Cylinder Head Material
RE: Air Cooled Cylinder Head Material
The 300 series aluminum alloys are primarily aluminum alloyed with silicon. These alloys pour well, and are the bread and butter alloys for most aerospace and automotive use. But they are not the best at high temps, therefore are not the best for air cooled engines. Continental and Lycoming both use a 200 series alloy (aluminum alloyed with copper) for the cylinder heads of their air cooled aircraft engines. Duetz Diesel uses a special alloy called RR350 for the cylinder heads of their air cooled diesels.
RR350 is similar to A201 (A201 is an alloy designation that is more common in NA -- RR350 is a European spec). A201 is relatively expensive (it is aluminum alloyed with copper and silver) and hard to pour (consider only a foundry expereinced with A201). But it is the best in terms of fatigue life at high temperature.
Dick
RE: Air Cooled Cylinder Head Material