Air holes in hat nozzle bodies

I fear that I might sound like an idiot, but why?

Always have been told to run those in the hat, and obviously not in the manifold, just wondering what the holes actually do??

 

They bleed air into the nozzle when there's a vacuum behind it. Hence; aerated nozzle.

 

I've been told they aid in areation of the fuel. For me, they dowse me in alky when the chutes are out.

 

I'll second that...they make for a good windshield cleaner

 

Correct me if I am wrong because I am new at this but I understand them to work as a way for the blower to pull air rather then fuel when you lift on the throttle otherwise the blower would pull fuel and keep feeding the engine.
When the blades go shut the blower is still pulling vacuum and the fuel would just get sucked in, correct?

 

Fuel comes out my nozzles when i lift. Of course, my pump saver on my Kvalve is plumbed to the dist block for my hat nozzles. It is a nice way to cool off after a long hard 7 second pass.

 

The aerated nozzle is pretty much just to break up the fuel, especially at an idle. I think it's more important on naturally asperated engines, as the blower most likely mixes it up, but I dont know of anyone who doesn't use them on nozzles that are used at an idle in the hat.

 

Now you know one.

 

Yes that hole helps to atomize the fuel but that hole is also there to break the siphon action of the fuel when the engine is running and the throttle is shut and the hat is under vacuum.

 

wouldn't an air bleed take care of the problem? We run the bodies with no holes and a small air bleed.

 

Alot of it has to do with giving the engine extra air at idle. Without them you would have to have the injector blade opening alot wider.Guys running PSI's that dont use airated nozzles usually drill holes in a couple of the injector blades to compensate.

 

The first job of those airation holes is to atomize the fuel but the second function is to help break the vacuum behind the throttle blades,when you do a burn out and the first time you strick the throttle its ok the blower speed is low and the vacuum behind the plates isnt too bad now let off in the burn out with the engine speed @ 7000 or so and the blower sucking those plates shut the throttle gets soo hard to open that when you push on it....it takes soo much force it will snap open almost uncontrollably and make the car almost un-driveable.hope this helps (learned it the hard way)Ken