Racing Beat's Holley carbs have had a nipple for oil injection for decades. Works well enough. The oil doesn't seem to mess up anything.

I'd like to add a nipple to an Edelbrock so I don't have to premix. There is an undrilled vent casting for marine use that I'd like to drill and tap for a nipple. How would the introduction of oil affect the accel pump plunger and other carb seals? Any thoughts?

 

Well, lets think about it. if you premix you have the same issue because the oil is in the gas. So I would think its a non issue. You could tap it into the bowls instead. Just an idea.

 

That's a good point about the premix oil getting in all the same places. Thanks.

I gotta pull the carb today anyway so I'll take a good look at it for places to install the fitting.

 

I guess the only thing to watch out for is to NOT put the nipples in a place that generates positive pressure.

Not familiar with the Edlebrocks. How will they do on cornering? Better than a holley (even with the special floats setup)? Keep us posted.

 

I used the marine vent location for the oil nipple. Most people wouldn't do this because most of the oil tends to go to the front rotor. However in a supercharged setup where the intermediate ports are joined together just inside the manifold, it doesn't really matter.