Carb Heat

[Pttim]

What source is commonly used for Carb heat? are you taking heated air from the bottoms of cylinders? heated air from oil coolers? shrouding and exhaust tube and using that source?

I'm thinking the best would be from the cylinders but dont want to cause a restriction so as to cause overheating. Any thoughts or suggestions on this.?

One thought was to take an inch and a half tube attach it to the bottoms tin on aft cylinder then plumb it to me carb heat box. The thought being if carb heat was not selected the tube would be deadheaded and the waste hot air would follow its normal path out the cowl.

Tim

 

[phzabriskie]

Good Question!....I will be interested in the response here too.
-Pete

 

[jriley]

Regarding your carb heat question. Most aircraft both certified and homebuilt use a heat muff that either surrounds the exhaust muffler or an exhaust tube. The fresh air for this is usually taken from the engine baffles but may also have a dedicated air inlet on the cowling. The benefit of using the heat radiated from the exhaust system is that it does not add a restriction to your cooling system.

JR

 

[SONERAISCOTT]

Do vw's need carb heat? Does it depend on the carb type? just wondering

 

[eschrom]

I don't think the engine makes any difference but the carburetor does. Some are more susceptible to icing than others. Many people who have used the slide type carburetors (Posa, Aerocarb) that were configured to draw warm cowling air claim to have run quite successfully without auxilliary carb heat. I'm using an Aerocarb and that's what I plan to do.

Ed
2LS, GP 2180

 

[splischke]

I made a small heat muff that surrounds the right rear exhaust stack. It fits within the tight confines of the cowl and provides a modest increase in intake temperatures. If you look carefully at the attached picture, you'll see a screen door return spring wrapped around the stack to help increase heat.