Sweating Carb

[Swift III]

Well the 2N front mount that we rebuilt seems to be working ok. It doesn't idle up and down like it should I am thinking its the Gov. however...

Everytime I run it the Carb sweats :? . The carb was rebuilt, soaked for over 24 hours, Blown out with 90psi, dug around in it with some wire for the gunk you can't see.

What would make it sweat? improper setting? I don't remember our other N sweating, this think when you shut it off has a puddle of condesation on top. It doesn't feeel or smell like anti freeze. What do Ya'll think?

 

[HCooke]

Well when gasoline is vaporized it cools dramatically. So, if the temp of the metal drops below the dew point you will get condensation on the outside of the carb. OT - my uncle's WW2 unit used av fuel to cool beer in the Burma-China theater. Same principal.

 

[Den N Ms]

The alcohol thats in the gasoline now days will make the carb sweat easier than just straight gasoline.

 

[Swift III]

Thanks for the replies, if its the darn new gas :roll: guess I'll just have to live with it.

 

[Colin King]

It's a result of the venturi effect of the carburetor sucking fuel into the intake and is perfectly normal. In winter, you may notice frost build-up on the outside of the carb body, which is the same phenomenon.

Colin, MN

 

[old]

I would not worry about it. Now if it didn't do that then it is time to worry because that is just how a carb works

 

[Kevin Singleton]

I wonder if this might be the result of a "pusher" fan? My "52 8N with a "puller" fan seems to move enough warm air over the carb to avoid any sweating, but a pusher fan would be blowing the other way.

Just wondering.
My 8N

 

[GB in MT.]

[b:05d968ee87][i:05d968ee87]
You said:....."What would make it sweat? improper setting? I don't remember our other N sweating, this think when you shut it off has a puddle of condesation on top. It doesn't feeel or smell like anti freeze. What do Ya'll think?"
I think, yer air to fuel mixture needs atten.!!!
I also will tell ya this....I've done LOTs of carbs' for members of this forum,
and never have had any reports of sweating to Your extent.
Do carb's sweat?????.....yes
Can it be any of the symptoms that others have already posted here????
Yep........But you say: that yer other "N" didn't sweat like this one, and prob. didn't .
I use and run my 2N with the cheapest fuel I can buy, and MINE don't sweat.
Here's a few things to check on.
Are you useing a thermostat??? If not get one. Runs the engine at proper heat.
Is the oil in the air cleaner pot, at proper level....Fuel to Air!!!! again!!!
Check to insure the venturie is in the carb. correctly...NOT up-side down!!
Insure NO air leaks, at the carb. to manny!!
Pe-heat the engine , just a little above idle, before using the "N"
Last...but NOT least.....Reset your carb adj. needles to:
Two complete turns out on the power needle,...and leave it there!!!!
One turn out on the idle adj. needle, then adjust for highest RPM's, and lowest idle screw adj.
Once ya do ALL that.......report back how it tested out.!!!!!!
Inquireing minds....want to know!!! :lol:

Gary :?: [/i:05d968ee87][/b:05d968ee87]

 

[Jerry/MT]

By "sweat", I think you mean water vapor condensing on the carburetor"s exterior surfaces. That"s perfectly normal due to the evaporative cooling occuring when the gas vaporizes in the caburetor body. In ambient conditions when the air temperature is below ~50F and the humidity is elevated, you can actually form frost on the carb. The engine may run ratty for a while because there can also be ice formation inside the carburetor as water vapor in the air flow condenses out and freezes in the venturi section where the metering nozzle is located. Once the engine warms up a bit this condition will clear from the heat transfer to the carb body from the manifold.

Some folks build contraptions to duct radiator cooling air over the manifold and then over the carb to reduce the length of time that the engine runs rough. Me, I just let it clear itself.
Personally, I don"t think you have a problem.

 

[Anonymous-0]

My carb doesn't sweat and I have a pusher fan. The engine does run just a little warmer since the fan really doesn't use the shroud in the same way as it does when it pulls. My 2 cents.

 

[Musclenut]

My carb always sweats and runs great.

 

[G.Bott]

This may sound a little off topic but I know on the newer chainsaws they have heated carburetors to help this problem. It is a option along with heated hand grips.
G.Bott
Tree trimmer by profession

 

[Swift III]

thanks all as soon as the rain stops I am gonna try GB's carb suggestion and post back!