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<p>of the skirt than at the crown.</p>

<p>Early pistons were of <a href="page.php?w=cast_iron">cast iron</a>, but there were obvious benefits for engine balancing if a lighter alloy could be used. To produce pistons that could survive engine combustion temperatures, it was necessary to develop new alloys such as <a href="page.php?w=Y_alloy">Y alloy</a> and <a href="page.php?w=Hiduminium">Hiduminium</a>, specifically for use as pistons.</p>

<p>A few early <a href="page.php?w=gas_engine">gas engine</a>s had <a href="page.php?w=double-acting_cylinder">double-acting cylinder</a>s,</p><p>
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