Just got off the phone with snow and learned some interesting stuff. First off, my 150 pump is maxed at 150 so I would need the new pump to get the 220. Also found out that spraying pure water actually takes pressure off the cylinders and that 2 .625 nozzles is to much for pure water. It's the meth itself that adds pressure since it's the one doing the burning and that if I was to add more meth in then the 2 .625 nozzles might not be to much. Also learned that they've got a stock 04 dodge (stock turbo, stock injectors, stock head, stock head bolts, 500hp) that's been spraying 70% meth for 120k miles with no issues. Now to me this seems backwards. Wouldn't the water increase the cylinder pressure since when it's converted to steam it expands at an insane rate? I know it takes the heat away but all that steam has to go somewhere?

 

Your assuming it converts to steam BEFORE the exhaust port opens! For that matter...I don't think it's safe to assume it ever gets to steam ... in the milli-seconds it's being compressed? Compression might keep it from vaporizing (to steam)? Just thinking out load.
Point is, I think, it cools the compressing air before the fuel is injected!

The engineer at Snow's told me they were getting 100 hp out of their 04.
Better them then me.

RJ

 

Well if their adding 70% meth their puttin more burnable fuel to the engine than say a 40/60 mix so more than likely for a stock truck they should see more of a gain in power......right

 

That's right, Rowland - the high cylinder pressure present during the compression stroke raises the boiling point of the injected water much higher.

Another important benefit of adding methanol (or nitromethane ) to the water is to realize the significant cooling effect imparted to the charge air by the methanol's latent heat of vaporization.

 

Ahh, didn't even think about the effect pressure has on the boiling point. And to think I'm in basic chemistry.

So maybe I shouldn't be to worried about spraying washer fluid? Need to do some testing.

 

How much fluid does your system shoot into the intake system for a 1/8mile run? I would run a primary pump to supply the 220psi pump. Has any body ever ran a pressure guage at the orifice? Interesting discussion.

 

No but there is a kit to put a pressure gauge in line with the nozzles. Why would you run a primary pump to supply the main pump? I haven't run the truck down the strip since I installed it.

 

Reworked the math (with some help). The Nozzles are .625 gal/min at 220 psi!
Make sense when you consider going through a gallon in about 10 passes at the 1/4 mile.

BC847 may have a point about the 1/4" hose being the limiting factor...reducing the flow... especially with two nozzles?

On the other hand... Matt Snow is no rookie and should have a reason for the 1/4" lines.... and injecting H2O/Meth is, I bet, one of those times when more is not necessarily better.

RJ

 

Rowland, that seems like an awful lot of flow for those nozzles... 75 GPH for both?

AFAIK, the pumps deliver a volume of fluid at a rate which is about an order of magnitude greater than the jets require; for instance, my jets flow 10 GPH per pair at 100 psi, and the pump delivers 84 GPH at 100 psi.

Due to the large flow rate "overhead" of the pump to the nozzles, I don't really think smaller diameter lines, longer lines or multiple angle fittings significantly handicap the supply volume to the jets. Of course, supply pressure is unaffected by such things.

However, I prefer to use long lengths of large diameter (1/2" ID) high-pressure supply tubing, as it acts as a sort of "surge reservoir" (similiar to a diaphragm tank in a wellwater-pumped fresh water supply system) to keep the pump from cycling too rapidly on it's pressure switch. I also ran a fixed-orifice bypass bleed to circumvent the cycling, since the pump is rated for a continous duty cycle.

p.s. I mounted a 160 psi gauge on the H2O/meth injection manifold for dyno testing.

 

Interesting. I've got washer fluid in the tank now but I haven't sprayed on it yet. I'm a little nervous. I turned the pressure up on the start and stop so hopefully that'll help with the bog.

I'd do all new lines but that would require new fittings as well and that's a pain in the behind. I think I am gonna go ahead and get the bigger pump though.

 

I think that would be good, Tyler

 

Thinking out of the box on this one, what are the beniefts of running a higher pressure pump like around 1000-2000psi to a variable flow injector. I'm thinking about building a system like that. I just have to find some solenoids to allow me to pressurize my system up to that pressure.

 

It certainly wouldn't be a cheap mod, and I'm not sure what it's benefit might be... if your jets atomize the fluid properly (sub 50 micron droplets), and the pump flows enough volume and pressure overhead under high boost conditions - what more do you need?

 

NOS, lots of NOS. How much before you would lose an engine? A engine should survive a 900 plus run right? I'm thinking of trying this as long you wastegate my twins to 45 to 50psi, I should be safe for the fun stuff. My tranny might die but that something different. Whats the PSI rating on snow's solenoids. I have to see if my buddy was selling me BS on the variable flow methanol injectors. He's a salesman and we were drinking beer.

 

Properly prepped, sure - but don't expect to make a bunch of withdrawals like that from your CTD account year after year!