ok so i just finished installing 2 air horns off of an old fire truck. i used a SCBA tank because im a fireman and can get them refilled for free. I had to build my own kit for these horns. First off I bought a welding regulator because the SCBA tank hold 3000psi. I bought a 1/4in solenoid and 1/4in tubing and all the fittings i needed from lowes. Because of lack of room due to my small car Scion tC i mounted one horn behind the front bumper and one by the rear bumper.When I ran all the tubing and everythhing im only getting air goin to one horn. I pushing 150psi through the airlines. i forgot to say that the reason i went 1/4in tubing is because the horns i have use 1/8in. Any sugestions on why im only getting air to one horn?
check your splitters and airline for cracks and are you sure the second horn is working to begin with? try supplying air to that horn only and see what happens
also pics of your setup might help
yes i know both horns work. i bought repair kits for both of them and i tested them out and they do work. i doubt if it the air lines because they are brand new and i didnt even drive the car before testing. but i will check my splitter. another question will the horns sound diff because of diff lenghts ho lines running to them? I have about 15ft running to the front horn and about a foot and a half to the rear
i suppose the one that’s working fine is the rear one, right?
I can’t imagine a welding regulator having enough flow capacity.
Could be wrong though.
actually the it was the front one that was working when both are hooked up
There’s something wrong then… teorically the one with the shorter pipe should play first. Maybe there’s something wrong with the splitter. Remove the front one and see if rear one gets air. You should find the problem.
they both work fine by themselves when i just run them off the regulator and tank. but when i run them by one at a time off the solenoid the dont sound right (the start off high pitch then get a deeper tone). i dont kno if the solenoid isnt letting enough air through or what
I used to blow a 1510 with a 1/8" solenoid… so a 1/4" should be perfect for 2. In any case you should use the same lenght for both horns from the solenoid.
If i were you i’d use 2 solenoids.
Mine was connected directly on the horn using a 1/8" nipple and honking was immediate.
Anyway just try what i told you. Block the flow on the working horn and see if the other one gets air.
And remember, 1510 works with 120psi max, don’t go over 120!!!
thanks for the info. i was thinkin bout moving the solenoid closer to one of them and only running one horn
Sounds like lack of air flow. The 1/4" solenoid might be big enough but a welding regulator allows very little flow. Think about it - when you’re welding you can barely hear the gas coming from the nozzle. They’re not meant for high flow.
Thinking some more… If you had enough air volume/flow, both horns would sound strong, but one would sound before the other because of the different lengths.
a regulator used for soda fountains works well
This doesn’t explain why the horn which plays is the one with longest pipe… it doesn’t make sense.
thats right if it has air going to it it should sound
regulator i have can hold up to 4000psi and cuts it down from 0-150psi (its a co2 regulator from a welding shop). this might be a dumb question buytwhat is the diff between air flow and psi. and does anyone kno what kind of pressure a soda fountain regulator can hold (the tanks im using hold 3000psi)
Ok, take lesson from what i’m telling you.
When i first installed my 1510 on my car i asked for a pipe which could handle me 150psi (10 bar) and the gut gave me a 4mm pipe (2 or 3mm ID i suppose). I installed the whole system, the manometer in my car was reading the correct pressure but when powered the solenoid i was only able to hear a weak BUO suddenly followed by SHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH (air flow).
That means pressure inside the pipe was correct but not enough.
Then i replaced the pipe with a 8mm ID and the horn blasted correctly.
Since you are running 1/4" pipes it should be ok, but i think the problem is in the splitter. Check it, and also inspect the pressure regulator… if pressure is ok check for the air flow!!! 
^ Well said. You needed more volume. A 5/8" line at 150 psi will have much more volume that a 3/8" line at the same pressure. Now that being said, you can make up for the lack of volume in a smaller line by increasing the pressure, but I’m not how much more pressure you would need to make it up. I’m sure there is a formula for that somewhere.
Damn, i make too many mistakes… i should check twice every post!!!