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Speedy Squirrel Speedy Squirrel is offline
Rocket Scientist
Join Date: Jun 2008
Location: Detroit
Posts: 906
All 911 turbos have had at least hollow stem exhaust valves. They are partially filled with sodium. Starting with the 964 based turbos, both valves are sodium cooled. For the 993 based turbos the stem diameter is decreased by 1mm and both are sodium filled.
Old 09-05-2018, 10:48 AM
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