April 2007 Issue
Power Shift: Cirrus and Tornado Alley
In 2007, more than half of all the turbocharged singles sold will be powered by systems built by a little shop in Oklahoma. Hereís why we think thatís a big deal.
Itís not much of a reach to posit that the entire survival of piston general aviation pivots around the exhaust valve, a $100 part that lives a miserable existence being slammed against a hardened steel seat 10 times a second swirled in a gale of white hot combustion gas. When an engine tanks prematurely or needs a midstream top overhaul, itís often something to do with exhaust valvesóbad guides, leaky seats, cracks around plug bosses originating near the exhaust valve.The engine makers and airframers have tried to meet these problems head on with mixed success.
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