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Dico,
As you note, a hole that bleeds air from the engine upper deck wastes a serious amount of air. Be sure there’s not an
un-attached piece of scat behind your engine, and if not, plug the hole. Common places to run “extra” cooling air are the gascolator, engine fuel pump assembly (on the back of the engine) and alternator on the accessory pad. There are likely others… but if
you don’t have an “extra” piece of SCAT back there, time to fix this.
You might consider asking the original builder what it was for…given the quality construction of your airplane, he would have had a plan for this; not an accident that it’s there.
My two cents…
Bob
I was inspecting my baffling for holes and found 3 scat hoses at the aft section of the engine. 1 of them goes to the gascolator, 1 goes to the vacuum pump and one goes to no-where... just blows air around
behind the engine and in front of the firewall.
This 1.5" scat hose is taking away valuable cold air that could otherwise be closed up and help cool my #3 cylinder which run quite hot on climb out.
I'm wondering if there is any reason that I shouldn't remove this scat hose and cover the hole? (since it doesn't appear to do anything).
-dr
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