I am building a pulse jet out of plumbers piping: 3/4' air intake ,2" combustion chamber, 1" exhaust, and a spark plug driven by an electronic grill igniter. I'm using a shop vac on reverse as an air supply. When I try to start the pulse jet, it will either backfire (sounds like a gunshot!) or it will start humming. We turn up the gas (using propane) and the buzzing gets loud. As soon as I pull the air away, the jet will stall out. Any thoughts on why it won't come to an idle without forcing air into it?
Thanks!
Plumbing Pulse jet stalling
Moderator: Mike Everman
Re: Plumbing Pulse jet stalling
Are you using a regulator on your propane bottle? As a rule of thumb: if you think you have too much gas, you don't have nearly enough.
What type of fuel injector are you using and how far down the intake is it?
Is your engine build from known plans (i.e., the pipewood/ ugly stick?)
What type of fuel injector are you using and how far down the intake is it?
Is your engine build from known plans (i.e., the pipewood/ ugly stick?)
Quantify the world.
-
- Posts: 5007
- Joined: Fri Oct 31, 2003 7:25 am
- Antipspambot question: 0
- Location: santa barbara, CA
- Contact:
Re: Plumbing Pulse jet stalling
The intake looks too short, and needs to be rounded inside as much as the wall thickness will allow.
Mike Often wrong, never unsure.
__________________________
__________________________