2150 air cleaner

[pyro]

I bought my 2150 carb 2nd hand and it came with a generic looking 8" air cleaner/filter combo, but no mount screw. Just curious to see what others have for an air cleaner setup.

[haminawag]

Well, I'd like to have either the stock air cleaner for my '79 so I could hook up the warm air snorkle for cold WX driving, or a dual snorkle setup off of a Plymouth 400 ci police interceptor, had one on my Fury for years, shoulda never gotten rid of it. Right now I'm using a generic 12" round, with a K&N element on the 2150. Runs fine except when cold.

[FSJunkie]

Engines need a richer carburetor in cold weather than in hot. Back in the day, carburetors ran a little rich in hot weather to make sure the engine didn't lean out in the cold.

Emissions came around and the carbruetors couldn't get away with being slightly rich in hot weather any more, so now carbruetors were jetted for the proper mixture in hot weather, but unfortunately ran too lean in cold weather. This was made up for with the warm air intake air cleaner to basically fool the carburetor into thinking it is summer all the time.

What does this mean for you?

It means if you run an emissions-era carb designed to use a warm air intake air cleaner with a conventional open air cleaner, it will be too lean in cold weather, particularly until the engine reaches operating temperature.

[VOX]

Engines need a richer carburetor in cold weather than in hot. Back in the day, carburetors ran a little rich in hot weather to make sure the engine didn't lean out in the cold.

Emissions came around and the carbruetors couldn't get away with being slightly rich in hot weather any more, so now carbruetors were jetted for the proper mixture in hot weather, but unfortunately ran too lean in cold weather. This was made up for with the warm air intake air cleaner to basically fool the carburetor into thinking it is summer all the time.

What does this mean for you?

It means if you run an emissions-era carb designed to use a warm air intake air cleaner with a conventional open air cleaner, it will be too lean in cold weather, particularly until the engine reaches operating temperature.

Uhhh...that's what a choke is for guy.

[Tatsadasayago]

The main purpose of the heated air inlet system was to ensure consistent air/fuel mixing to lower emissions and reduce fuel usage. A secondary purpose was to prevent carb icing.

By increasing the temperature of the air, the fuel will more effectively stay in suspension rather than falling out and forming droplets on the floor of the manifold.
The down-side is a loss of volumetric efficiency due to lower intake air density caused by the temp increase.