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Old 06-18-2017, 05:58 PM   #1
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Default Baffling

After what seemed like an eternity, I have finished the aluminum portion of the engine baffles on my garage project. About to install the ruberized baffling material and was wondering if there were any tips or tricks I should know.

Best regards,

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Old 06-18-2017, 07:04 PM   #2
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I would drill the holes in the alum first the in the rubber. Use clecos to hold in place. That way you can put the cowl on and see if it fits correctly and show any gaps that
You need to raise the rubber higher. And just the opposite to see if
The rubber is to high that needs to be lowered.

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Jacksonville FL ( Birth place of the Pitts )
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Old 06-18-2017, 08:59 PM   #3
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You can not have the rubber seals too high. They should fold over and overlap the top cowling 1.5"+. At speed you will be surprised how much pressure is trying to flop those seals the wrong way and allow air to dump around the engine rather than going through the cylinders for cooling. The cylinders depend on high pressure air above them and lower pressure air below. If air blows by the baffle seals this pressure differential is upset and the engine temps rise.

If you are regularly running CHTs above about 360F, check your baffle seals.

Best of luck,

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Old 06-19-2017, 11:27 AM   #4
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What Wes said, been there
Finished Spezio Tu-holer N92JM(Oct. 2011), AcroDuster 2- SA750 N22JM, first flight 12-14-15
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Old 06-19-2017, 03:32 PM   #5
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Just finished replacing the baffles on the new plane yesterday. I recommend picking up one of these..

and you will need these..

Pitts S-1S N427RD
Extra 300/S N434TJ
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