PVC wasn't made for air pressure.It'll take it for awhile but as temp under the hood increases the PVC handles less pressure.Just beware of it and make sure your okay with it.I've seen PVC pipe explode under pressure expecially if it gets hit with something.I'm talking around the same pressure your running.
Google using PVC for air lines.
The horn sure sounds nice,If you could find some copper pipe scraps from a plumbing contractor or scrape yard,then that would be a solid horn.Good job on your horn
Even when finished, my horns look like the last picture in post #2, where you can see the blue diaphram.
As for pressure on the PVC, there really is none. The pressure from the tank is held back by the valve. When pressure is released the air goes through the manifold, and through the brass nipple, then the diaphram releases with vibration and the air/sound waves goes up the center 1" pipe. I understand your concern over the heat and constant pressure on the PVC, but there is none. I am more concerned about the diaphrams holding up over time, but that is why I made the back 4" retaining ring removable so the diaphram can be replaced.
Last edited by jaxfljeep; 02-15-2012 at 11:29 AM..
Awesome write up. I've been wanting to do this myself. Of course I'd love to put a big ol' lesslie tyfon A-200 on my jeep, but the pcv setup is so much more economical. Now all you have to do is get rid of that ball valve and wire a solenoid in there for push button response. I'm sure I'll be referencing this later to build my own.