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Old 07-12-2011, 12:57 PM   #8 (permalink)
DonR
Master EcoModder
 
Join Date: Mar 2009
Location: Northeast Ohio
Posts: 269

The Wife's Hot Rod - '09 Pontiac G8 GT
Last 3: 23.22 mpg (US)

Big Outback - '13 Subaru Outback 2.5i

Little Outback - '02 Subaru Impreza Outback Sport
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WWII German Torpedo's used engines with rotary valves. No springs. I can't attest to how much friction there was. & it's not like longevity was at the top of the priority list. Only had to go maybe a mile or two on a limited air supply.

I know F1 engines use pneumatically assisted valve springs to close faster. This does not use a solenoid.

Just make sure you can never crash a valve.
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