[AJ85WA]

Hey guys

Engine is Lycoming o-320 160hp carb running AVGAS with 4 into 2 vetterman exhaust.

I am seeing at the two exhaust tips what looks like lead crystals forming, imagine looking at ice crystals in a freezer forming long spikes. Well the spikes past the exhaust tip is only about 2/16 long max.

Is this normal?
I forgot to take a picture

Engine is making great power and only has 200hrs since rebuild.

 

[RV10inOz]

Too much rich running?

One other significant contributor is the refinery supplying your Avgas. They use more TEL than the other one in Australia due to a lower spec alkylate.

 

[AJ85WA]

Thanks Dave

Hi Dave

Thanks for the reply, I will grab a picture next time, but don't think it's serious, I was just more curious

BTW what is TEL?

 

[RKellogg]

Tetra Ethyl Lead

Tetra Ethyl Lead