vze4fhpv

iTrader: (5)

Two questions,

Number 1 - how many psi should there be in a 10lb bottle when full? My vendor can only get 800-900 psi... he attributes it to the bottle becoming hot and can only fill so much till it cools back down.

Number 2- how hot does a heater need to get your bottle to be effective, I called zex the other day and they told me the zex heater only heats to 85 degrees then turns off. Is that hot enough?

first350

iTrader: (24)

#1, I'm not sure about what the final pressure should be, but if you have a big frezzer at home, put the tank in there overnight before getting it filled...the shop I bring my bottle to also puts it in there freezer for about an hour and then fills it up. (I think the bottle pressure is usualy above 1K when I first hook it up w/ no heater...but that's also a function of ambient temps)

#2 it's not about how hot, but what pressure...you only heat the bottle to get the correct pressure. That's why a lot of new heaters don't have temp switches, but use pressure switches. The general equation PV=nRT comes into play (it won't follow this equation exactly b/c the N2O pressure is high enough that it'll be in a gas/liquid phase within the bottle...that's why bottle location and angle is important - they want liquid N2O going into your lines)...increase temps --> increase pressure. Also, as you loose N2O mass (from using N2O) you'll need higher temps to maintain the same pressure.

here's some technical data on N2O:
http://encyclopedia.airliquide.com/e...a.asp?GasID=55

-peter

Blurr350z

iTrader: (1)

PV=nRT would be a rough estimate because N2O is not an Ideal Gas

Old School

iTrader: (28)

You measure nitrous by weight, not by pressure....when they fill it up, they put it on a scale...that tells you when its full. Getting it colder before filling is always a good idea....makes room to cram more nitrous in the bottle...but again, pay attention to how much the bottle weighs...not pressure...if you want more pressure, the bottle warmer will take care of it. I have a Zex plug in bottle heater.

MikeEwithTheZ

iTrader: (11)

when you get it filled, a lot of people will put the bottle in a fridge and then take it out to fill it...for reasons Old School mentioned...make sure you see them weigh the bottle to avoid places rip'n you off...i caught a shop like that...

Audible Mayhem

iTrader: (48)

yeah, the old style nitrous refill stations need a cold bottle, the new ones dont.


we just set it in a bucket of ice or the freezer, even with the new style they use air to push in the nitrous, and if its cold the nitrous just flows right in...


the bottle needs to get from 90-98 degrees to get to the correct pressure for running nitrous...

vze4fhpv

iTrader: (5)

Thanks for the feedback guys... they do weigh my bottle to see if it's full but it still only goes to 800-900psi once installed. The heater works a bit but I asked the folks at zex and they said it only heats to 85 degrees... they should put some kind of adjustment on that...

rico3682

iTrader: (13)

you can wire up the heater and remove the temp sensor so the switch is in complete control of the heater being on or off, but you have to keep close watch on your pressure. it can be risky if you dont pay attention or you happen to leave it on when you get out of the car.

as mentioned, they weigh the bottle when filling it. a cold bottle allows them to cram more nitrous in the bottle. they do not fill based on pressure. usually mine is 900-1000 right when i get it filled, then after sitting in my hot car it is as high as 1200. which is not too safe, so i purge it a bit or i use it sporatically. ideal is 900-1000. even after a few sprays, my NOS heater can get the bottle to mid 900s. today my pressure was close to 1000 due to the high temps in sofla.

vze4fhpv

iTrader: (5)

Thanks for the info guys...

MikeEwithTheZ

iTrader: (11)

what zex?????????not you i thought you only rolled with NX stuff...j/k