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nfonville

Heat Shield

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I have an issue with the heat shielding on the air input duct on the right side.  The exhaust is really close.  I keep replacing the heat shielding cloth every oil change at 25 hours. It's looking pretty burned from heat. I'm using cloth rated to 2000 Fahrenheit.  I've looked very closely for exhaust leaks and no exhaust soot is there. Is this a common issue?

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Right side sitting in the plane or right side looking from the front of the motor? Any pictures would be helpful??

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passenger side. I wish I would have shot photos.  I will next time when I open it up.  It just dawned on me when I got home to post.

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I had assumed it was standard, but maybe it got put there by a previous owner: the inside of my intercooler duct is covered by a thin sheet of aluminium

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I was thinking about fabricating an aluminum shielding to be more permanent.

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On the exhaust side of the intercooler duct you should have a thin piece of stainless riveted to the duct.  On your airplane a careless mechanic probably destroyed it.

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I don't have any aluminum or stainless on mine and there are no holes where rivets were, just the heat shielding cloth. Mine is serial number 27-0150.

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Cloth rated for 2k°F...?

The hottest part of the exhaust might exceed that or get kind of close...  the TIT is typically kept at 1650°F and that is further downstream than the exhaust headers all meeting...

Either way 2000°F doesn’t leave enough of a safety factor... the TIT is probably the hottest measured point in the exhaust, not the hottest part of the exhaust system...

PP thoughts only not a mechanic...

Best regards,

-a-

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Could someone that has the stainless shield please take a photo when they have their cowling off?

Sounds like in the mean time, I need to find some 3k type cloth.

Thanks, Neil

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