Exhaust pipe look and feel

[PTK]

The inside of the exhaust pipe on my plane has an off white, light grayish appearance. It feels very dry and definitly not oily at all. No sooty residue on fingers whatsoever. I run it deep lop, 30 to 60 deg lop and more sometimes. GAMI spreads typically range from 0 to 0.2 gph.

Here are a few pics. How does it look to you guys?

[1964-M20E]

Before I read you post I was thinking LOP.  Do you get a lot of the same type of residue on the belly of the plane?

[PTK]

Before I read you post I was thinking LOP. Do you get a lot of the same type of residue on the belly of the plane?

I haven't noticed any. But I haven't looked for it either.

I'd say no. If any its very little and doesn't stand out like black oily soot would. You know how you see on some planes aft the tail pile that characteristic black sooty oily tail streak.

[Marauder]

The inside of the exhaust pipe on my plane has an off white, light grayish appearance. It feels very dry and definitly not oily at all. No sooty residue on fingers whatsoever. I run it deep lop, 30 to 60 deg lop and more sometimes. GAMI spreads typically range from 0 to 0.2 gph.

Here are a few pics. How does it look to you guys?

That looks normal. It's just the excess CamGuard burning off

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[jetdriven]

Looks normal to me. Mine is more a brownish tinge but I fly 15-25 LOP

[orionflt]

Looks good for the range your flying, if it was blackish it would mean your running way too rich. Mine is more of a tan but i'm carburated and running between 50-100 ROP.

 

Brian

[Jeff_S]

I've not spent any time looking up my exhaust pipes, but I do get the whitish residue on the belly, especially toward the rear of the empennage.  Seems pretty normal to me...I had the same thing on my J, which I also flew LOP.

[Shadrach]

Mine looks the same, as does the GS antenna just down stream. Our belly is pretty much oil free. Just a grayish white film running from the exhaust to the tail. Oil consumption trends around 1qt every 12hrs. We're at ~1100SMOH 300IRAN.

[aaronk25]

Id offer a guess if your running deeper LOP than most and have more white build up its probably additional left over by-product from the lead since 60lop isn't as efficient as lesser LOP settings.