Holley/Demon Carb stumble

flyfish said

That's funny that Mallory's propaganda says that their regulator is soooo much better than the Holley.....yet the diagram shows that they are the same on the inside, lol.

Click to expand...

I think the ball seat regulator is a deadhead type. Goes in line with the flow.
And it works something like this.
When pressure on the ball and diaphragm is low, fuel flows past the ball.

As pressure in the regulator rises, the diaphram moves up allowing the ball to seat.


With the Bypass regulator, I think it works like this.
As long as pressure is low, fuel goes straight through.
As pressure against the diaphram rises, the return valve opens; and the stem may also partially block straight through flow.