Re: Exhaust residue

["George (Pete) Tolleson" <gtoll@worldnet.att.net>]

ROBRTM3 wrote:

> Just curious if there is a consensus as to what would be the cause of 
> slight waterbase soot type residue from the exhaust pipe, mostly right 
> after start up; and it seems to be curbed after running for a while...

My first thought is water vapor from combustion condensing in the cold
exhaust pipe, and soot from the initial rich mixture before the choke's
released. The water stops condensing after the ppe's warmed up, and the
soot stops when the mixture's leaned out.

Pete
'68 BGT