2 bottles

[WOOSAB]

Im currently running a 40 shot on my 08 busa with a 1 pound bottle. Well it doesn't last long. Originally I did 1 pound bottle because I could fit it under the passenger seat no hump and no1 knew I had it. No after a few races most of my friends know.  So my question is can I add a 2 or 2.5 bottle on frame by back tire and have the 1 and 2 pound bottle work together? If so what all do I need.

[Noswizard]

2 bottles are always better than 1 BUT for optimum results they should be IDENTICAL (in all respects), otherwise one bottle will empty before the other and to a great extent, defeat the object of having 2. This is particularly applicable to Drag racing use.

[wildphil69]

If you have them T'd together they will empty at the same time because the pressure will equalize. unless im just dumb and cant understand the concept

[Noswizard]

If you have them T'd together they will empty at the same time because the pressure will equalize. unless im just dumb and cant understand the concept

That's what you'd expect and if you were dealing with a high pressure gas and NOT A LIQUID GAS, that would be the case. However, in actual practice when dealing with a high pressure LIQUID GAS, the bigger bottle (or the bottle that can maintain its heat better), will empty before the other.

Both bottles will start to flow initially but as the bottle that is least able to maintain it's heat falls in pressure, the one that maintains its heat best will not only feed the solenoid but it will also top up the low pressure bottle.

That's why the bottles on multi-bottle systems MUST be IDENTICAL in ALL respects. Even the colour and type of coating (paint/nylon powder), affects the heat transfer rate and therefore the rate of pressure drop. For example; a bottle with a white nylon coating will lose pressure much quicker than a bottle which has a thin black coating, because nylon is an insulator and white reflects heat, whereas black absorbs heat and paint conducts heat. Likewise, a small bottle will lose pressure quicker than a big bottle, because there is less bottle mass and surface area for heat to act on and conduct through, plus you have a greater mass of liquid nitrous readily available.

BTW this is NOT a matter for debate, these are absolute FACTS that I've proven beyond a shadow of doubt and when you apply the basic laws of physics, it's OBVIOUS that what I'm describing MUST be the case.

[RansomT]

and you missed one Trev:  If you "T" the bottles together you have introduced a 90 degree turn that will cause all kinds of turbulance.  The result is inconsistent flow and all kinds of other issues.

You have to be careful on how you tie the bottles together (don't use blocks or Ts), plus as Trev (sometimes not so gracefully says  ) the bottles need to be at the very least the same pressure and same volume before introducing them to the system.

[Noswizard]

and you missed one Trev:  If you "T" the bottles together you have introduced a 90 degree turn that will cause all kinds of turbulance.  The result is inconsistent flow and all kinds of other issues.
All very true (didn't miss it as such but just concentrated on the bottles themselves) and that applies to numerous aspects of system design.

You have to be careful on how you tie the bottles together (don't use blocks or Ts), plus as Trev (sometimes not so gracefully says  ) the bottles need to be at the very least the same pressure and same volume before introducing them to the system.
I leave "graceful" techniques for those of a more delicate nature. 

[SLEEPERBUSA]

the bottles need to be at the very least the same pressure and same volume before introducing them to the system.

Won't the pressure and volume equalize when both opened?

[Noswizard]

INITIALLY yes they will BUT what happens after that, is what's important and that depends on how much heat/pressure EACH BOTTLE can maintain and unless that is IDENTICAL, then one bottle will empty while the other stays full, so all you're doing is carrying surplus weight for no performance gain!!! Plus you're also most likely to be causing disruption to the original single bottle nitrous flow, so your results are likely to be worse with 2 DIFFERENT bottles than if you only had one. 

[SLEEPERBUSA]

I have 2, 2.5 pound bottles that are identical. I probably won't ever need 2 unless I'm going the whole mile, so I should be good.
IF I go the mile, I'll make sure volume and temps are the same.

[Noswizard]

Assuming they are NOS brand bottles (or any other with a nylon coating), you'd get better results by removing the coating and either giving them a light coat of black paint or leaving them bare metal.

Furthermore, I've seen bottles that 'APPEAR' to be the same from NOS, that have actually had a different coating thickness and as a consequence have performed differently, so it's even more important to remove the coating when 2 are used together.

[SLEEPERBUSA]

How about powdercoating them to match my bike?

[WOOSAB]

So can I run a manual y valve and use 1 at a time. As 1 runs out switch to the next?

[Noswizard]

You wouldn't need a Y 'valve' you'd just need a Y 'piece' and turn one bottle on and off at a time.

If it's not for racing applications you can turn them on together and it doesn't matter that one will empty before the other.

If it is for racing I'd just switch bottles as they ran out, rather than carry both on the bike at the same time.

[California Kid]

      Call NX Nitrous Express and get a billet pure-flo Y fitting . I use 2-2.5 lb bottles mounted on my rear hump and I connect the 2 lines to a billet pure-flo Y fitting  and the other single line goes stright to the air box , it works perfect  .




Bill

[BlueHaya]

I have a 2# bottle in the hump and a 2# bottle in the swingarm connected via a Y using a spray bar instead of fogging