[94cobra69ss396]

Anyone have experience with using a bottle heater? I just installed one on the Chevelle and wanted to know how long it takes to heat the bottle up prior to a run on say a 65 degree morning? Do you turn it on in the pits or do you wait until you are in the staging lanes?

[Sonic03SVT]

way too many variables. if you cant read pressure, get a gauge. if you can, just warm her up until you see 1100-1200 psi or thereabouts, depending on temp outside, bottle size, mounting location, can vary greatly as far as time spent warming. - definitely dont wait till the staging lanes, chances are you wont get it warmed up, unless youre going to be waiting a while.

[94cobra69ss396]

Thanks Sonic03SVT. I do not have a pressure gauge but the kit does have a thermostat that cuts out at 85º F +/- 5º F and according to NOS ideal temp for the bottle is 90º.

[Vettezuki]

What's the technical reason for heating the NOS?

[BADDASSC6]

Standard temperature and pressure my friend. the idea is by warming up the bottle you will increase the pressure differential between the atmospere(14.7psia) and the bottle (900psia). The greater the pressure differenttial and higher the mass (and volumetric) flow rate out of the bottle. The highe the mass flow rat the greater the amountof oxygen inserted into the motor the greater the amount fo fuel you can burn. More fuel burning under normal conditions the greater he amout of power the motor can put out. As youy hit the Nitrous. The expansion of the gassed will cause the bottle to cool down significantly. As the bottle cools down the gassesb will contract and the bottle pressure will frop dramaticaly. This pressure drop will result in a unreliable system and give ou inconsistent power levels based on the varience an NO2 O2 flow
CNj

[Vettezuki]

Thanks! I suspected the gas laws were involved (well duh I guess) but didn't put it together that it was so important for short blasts. I've been enriched.

[94cobra69ss396]

The issue that I've had is that if I run anything more than a 150 shot there is not enough bottle pressure and the car runs rich. I did some testing on a chassis dyno using jetting for a 180 shot and a bottle temp of 65º. I started with the recommended jetting for N2O and fuel but the afr was below 10:1. I kept dropping the jetting size for the fuel but it was still rich so I call NOS and they told me the bottle temp needs to be 90-95º to have 950psi of bottle pressure which they say is ideal.

[94cobra69ss396]

Also, when I was doing the testing I pulled the bottle out and set it in the sun for about an hour and was able to get the bottle temp up to 70º. I then re-installed it and made another pull. It picked up 13rwhp from the increased N2O flow because of more pressure.

[Vettezuki]

Originally Posted by 94cobra69ss396

Also, when I was doing the testing I pulled the bottle out and set it in the sun for about an hour and was able to get the bottle temp up to 70º. I then re-installed it and made another pull. It picked up 13rwhp from the increased N2O flow because of more pressure.

Maybe you could hook up an inverter to your lighter and use a heat pad.

[94cobra69ss396]

I actually tried that but even with the heating pad on the highest setting it wasn't hot enough to warm the bottle. With the Edelbrock bottle heater I purchased the instructions have a warning that states the surface temp of the heater can reach over 400º.