Nitrous Question

[JJAB]

I have a friend that has nitrous on his drag truck. He is only shooting a 100 shot but here is the scenario. When he made his pass, we really think that the nitrous did not operate properly. Prior to the run we noticed that the bottle pressure was only 350. After some research, we found out that it should have been between 900 and 1050. Also, the bottle was full. Info please?

[vin63]

Researching things about nitrous after the fact can be very expensive. Not knowing how his system is set up, there really isn't any help we can provide. I would really spend time learning about running nitrous before making another run. He should've known about bottle pressure long before attempting to run the car - I would be quite concerned about how the rest of the system is set up if he installed it.

[nxtruck]

You need to check with the company that his kit is from on tune info. Yeah, it's not going to run clean with that low bottle pressure. Should be around 900-1050, like you stated. But, check with the manufacterer to be sure. Bottle will have to be heated to bring the pressure up to where it needs to be, and preferrably not with a torch!!

[Marv D]

Are you 'positive' it was full. Must have been a really COLD night somewhere in the USA for it to be 350. I used to keep one bottle on ice here in the desert SW (105° at frickin midnight) . Was in the 300psi range coming out of the ice as I remember. By the time I got to the front of the lanes I was purging to get the bottle cooled and PSI back down. Nitrous goes criticle at 97.5°f (can not be a liquid, but gas only)

[nomrlz]

^^^tru dat. a full bottle is lucky to get under 600psi on even a 50* night. even half full bottles will be double what your friend had on chilly nights. 900-1000psi is about perfect for spray. over that and your solenoid may get jammed and not open correctly.

[shawnt]

What jets did he use, what was the fuel psi flowing, what was the timing set at, plugs used and what kit is it? More info about the setup also.

I do agree that 300lbs of bottle pressure is way off but dont see how it got there unless you were racing when it was snowing (not literally, but it had to be cold) get a bottle heater to get that pressure up!!
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[1Bad62Pro/Street]

Throttle in a Bottle ...
Like Vin63 says we need to know how his system is set up, and how he is using it.

•Bottle: Aluminum or carbon fiber cylinder used to store nitrous oxide under high pressure. Nitrous bottles range in weight from about 2.5 lbs. to 20 lbs., and typically you can get 5-6 runs from a 10-lb. bottle (with most 125-horsepower kits).

•Bottle Heater: An electrically powered device used to heat a nitrous bottle for the purpose of increasing the pressure of the stored nitrous oxide. Recommended bottle pressure is usually 850-950 psi.

•Distribution Block: A component in the nitrous or fuel system used to feed individual ports from one incoming line.

•Dry System: A type of nitrous system that feeds only nitrous through the intake manifold and not fuel. Fuel is added by the fuel injectors or secondary nozzles.

•Fogger System: A type of nitrous that offers a more precise distribution of nitrous by having individual lines that go to each port in the intake manifold. Specially designed fogger nozzles atomize the fuel mixture very well so the fuel can be more easily burned.

•Nitrous Jet (Pill): Jets, or pills as they are sometimes called, are small machined pieces resembling little arrows that offer precise control of the nitrous and fuel flow to the engine. Individual jets are placed in a nitrous or fuel line the exact flow is determined by the size of the orifice in the jet. Jets with larger holes will flow more nitrous or fuel.

•Nitrous Oxide: Nitrous oxide (N2O) is a non-toxic, clear gas comprised of two parts nitrogen and one part oxygen. When stored under pressure (such as in a nitrous bottle), nitrous is in a liquid state. However, when released from the bottle nitrous instantly changes into a gas. At approximately 572*F the bond between the nitrogen and oxygen is broken and the oxygen be used for combustion. Nitrous also cools the intake charge, sometimes by as much as 75 degrees.

•Port System: A type of nitrous system that injects nitrous oxide (or nitrous and gasoline) directly into the individual ports in the intake manifold. This type of system allows for tuning of individual cylinders, but is more complicated than plate systems.

•Plate: A device installed between the carburetor and the intake manifold (similar to a carburetor spacer) that injects nitrous and gas into the engine. A typical nitrous plate has two spray bars (one for fuel and one for nitrous) that span the opening and spray a fine mist (of fuel and nitrous) directly into the intake manifold.

•Purge: A purge system allows any buildup of air in a nitrous system to be vented from the nitrous lines just before nitrous use. This prevents any hesitation caused by excess fuel without the shot of nitrous. A purge system is recommended for all nitrous kits.

•Solenoid: A type of electrical coil that when activated acts as a valve and in turn allows nitrous or fuel to flow from the bottle to the intake manifold.

•Wet System: A type of nitrous oxide delivery system that introduces gasoline and nitrous at the carburetor or throttle body and allows the mixture to flow through the intake manifold.



Take at a look at these more specific FAQ's:

http://www.holley.com/TechService/FAQ.asp?category=NOS

http://www.nitrousexpress.com/faq.php

Drive it like you stole it... 10.5 Outlaw In car...