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View Full Version : What are these droplets on my throttle blade at idle???


catamount
06-28-2013, 11:03 PM
After rebuilding my 4160, I've noticed that my idle is still slightly rich. I lowered the float below the 'parallel' level and it seems to have helped, but not completely eliminated the problem.

Upon inspection tonight, I noticed these droplets on the primary blades only. Is this an indication of something? I swabbed them with a q-tip and smelled them and they smell like fuel BUT I'm wondering if it could simply be condensation with a lingering fuel smell.

I was expecting a flooded condition to leave much bigger drops. Has anyone seen this before?

http://i.imgur.com/9zxbNaD.jpg

mikeg205
06-28-2013, 11:45 PM
I bet condensation - I've never seen a petroleum product bead up like that.... but I am just guessing.

2010Prostar197
06-28-2013, 11:57 PM
Condensation...

I saw that on a 351 I had many years back.

Humid conditions along with cool temps can actually form ice in the venturies.

93Prostar190
06-29-2013, 12:39 AM
Old planes had carb heaters for a reason ....

thatsmrmastercraft
06-29-2013, 12:55 AM
Where are your idle mixture screws set at. Should be 1.5 turns out from lightly seated +/- 1/4 turn.