Here's the problem on my buddies car. Here's his setup: 5lb bottle through aeromotive FPR. wet shot into carter carb. It seems that no nitrous is getting out of the bottle. When we purge, air comes out, and when we hit the wot, air goes into the carb not juice. We thought he had gotten a bad fill at the track, so we went to a different station to fill this bottle. Any help or suggestions would be awesome. Thanx

 

So your friend is still have the same problem after getting his bottle re-filled?

Matt

 

check the angle of the bottle, if the draw tube inside the bottle isnt submerged in the liquid nitrous it will just shoot air. thats why when you get a kit it comes with the 2 brackets, so that it keeps the bottle at the proper angle, and you should also have the label up, thats normaly the up side because the tube inside the bottle angles down, im guessing thats the problem.

 

we checked the tube and everything. We tore the bottle apart, pushed about45 psi of air through it to make absolutely sure there were no blockages or abnormal leaks.The only thing is there is a little blow by where the feed tube enters the nozzle. The problem is still there and hasn't changed through 2 fills from different stations.

 

Also we have checked the bottle at different angles, to include straight up. When it sits in the bracket, it sits at about 40 degrees

 

Are you saying there's some sort of leak where the top of the siphon tube connects to the valve? That would explain what's happening.

 

True,If there is a leak at the top of the pick up tube that may be the problem.Also make sure your bottle pressure is atleast 950
Dave

 

Is it being filled from a speed shop? Have you weighed the bottle before and after the fill?

 

It's been filled at the track, and out of a guy's garage(shop). With a 5lb bottle, we could only fit 4.5 lbs. The thing about the draw tube leaking where it is flared into the nozzle is, that bottle is a pressurized sys. right. I'm trying to think of Liquid O2 as a comparison. (I'm a C-130 Crew Chief) To me, someting is either making the NOS evaporate before it hits the system, or the it is too hot out, causing premature evaperation There is a solid supply of air coming out of the purge, and it is cool.

 

Well purging the system is supposed to remove the gaseous nitrous from the line right before a run. You should be able to purge until you see a whitish liquid coming out and that should only take a second. It won't just be cold, it can cause instant frostbite. It doesn't matter how hot it is, it will just have a higher bottle pressure. Nitrous boils at
-139F so temperature is kinda moot. It almost sounds as if your bottle has been filled twice now with gaseous nitrous insead of liquid nitrous. That can happen if you were trying to transfer nitrous from somebody's tank and for whatever reason they held it upsidedown, filling it with the vapor on top of the liquid due to the placement of the siphon tube. A good fill is really only going to come from a cryogenic pump at a speed shop. Freezing the bottle before filling can work, but its really tough to get a complete fill.

 

What I was trying to say about evaporation was, from the bottle to the jets/purge is approx 8 ft. (give or take). Could it be reasonable for ambient temp. to have an effect on "usable" NO2 to make it through the line. I might need you to break it down elementary style cause I'm a total nitrous rookie. I do however have plenty of experience with liquid oxygen. It's boiling point is -297, and temp/humidity will effect servicing and will cause it to freeze valves open/closed. Am I talking Apples and oranges here, or are they similar? BTW got any good deals on 255 pumps? Thanx

 

I understand. For all intents and purposes the nitrous is still "under pressure" in the line to the intake, or carb if you have a top shot type deal. Our ChevyII wagon uses a 15ft line from the bottle to the solinoid. All it takes is one full second for the purge to be liquid nitrous, maybe even sooner depending on when you open the bottle. Liquid being a relative term as its what you see when things start to frost up. When there are no solinoids open the line is an extension of the bottle being fed from the siphon tube. There isn't a problem of having gaseous nitrous in the line if the bottle valve is all the way open. I have to think you haven't been getting a good fill, or the siphon tube is much worse than you suspect. You can always take out the siphon tube and run the bottle upside down on its head, but that should not be necessary.