Q&A with Trevor!

[Trevor]

I used to run the mcmaster type nozzles with my old kit and judging from testing them out of the car the ones that snow uses atomize better (especially the 15GPH mcmaster type...that thing was pretty bad).

Snow nozzles are rated at 60 psi.

FYI, Snow is notoriously conservative with nozzle size/flow rate. I get the impression they think us monkeys can't tune so they sell us small nozzles that are easy to tune thru.

I'm not monitoring my pressure. No need. I have a wideband staring me in the face. If the pressure takes a dive I'll see the AFR's suffer. Shurflo pumps are adjustable. When you get the 220 psi pump out of the box its set below 220 (for ?warranty? reasons or something like that) and you need to turn the allen wrench adjustment thru the roof to peg it out. That and hotwire the pump motor so the pressure switch isn't in the circuit (and it never throttles back).

How does it cool better than gas you ask? This is easier to steal off the net than to type out...keep in mind when you read this that you have to inject ALOT more Methanol than gas to get the same AFR.

Closely related to volatility is a quality called "latent heat of vaporization". When a liquid is at its boiling point, a certain amount of additional heat is needed to change the liquid to a gas. This additional heat is the latent heat of vaporization, expressed in Btu/lb in Figure 2-2. This effect is one of the principles behind refrigeration and the reason that water evaporating from your skin feels cool.

Referring to Figure 2-2, gasoline has a latent heat of about 140 Btu/lb; methanol, 474 Btu/lb; and ethanol, 361 Btu/lb. In an engine, vaporization of the gasoline fuel/air mixture results in a temperature drop of about 40 degrees Fahrenheit. Under similar conditions, the temperature drop for ethyl alcohol will be more than twice that of gasoline, and for methanol the drop will be over three times as great. These temperature drops result in a considerably greater "mass density" of the fuel entering the engine for alcohol as compared to gasoline. The result is a greatly increased efficiency for alcohol fuels. To visualize why, remember that at a given pressure, the amount of space a gas occupies is directly proportional to the temperature. For example, if one pound of a gas fits into a certain container at a given pressure and the temperature is cut in half, the container will now hold two pounds of the gas at the same pressure. In an engine, a stoichiometric mixture of methanol and air would be over three times colder than the same gasoline/air mixture. This means that there is now over three times (by weight) as much methanol in the cylinder. Now, even though methanol has only half the heat value of gasoline, the net gain in "volumetric mass efficiency" is over three times. So, for example, if the gasoline/air mixture in a given engine cylinder produces 100 Btu on each stroke, the same engine would produce 150 Btu per stroke with methanol. This power gain due to increased volumetric mass efficiency is the primary reason for the popularity of methyl alcohol as a racing fuel. With ethanol the effect isn't quite as dramatic, but the greater heat value partially offsets the lower latent heat. Overall, this power increase with alcohol fuels considerably mitigates the liability of low heat value.

[badass3000]

in this pic, what is the large black thing in the lowest left corner?
and the thing above it with one blue end?
then that smaller black thing above the pump elbow fittings?
and those 3 bullet looking things above that?
Do you use a Snow controller? VC25 or VC100?

[jackhammer]

How many licks does it take to get to the center of a tootsie roll tootsie pop?

[Trevor]

http://www.snowperformance.net/

Install instructions:
http://www.snowperformance.net/produ...tion_pdf-8.pdf

I run a VC-25 controller only because they didn't have the VC-100 when I built my kit. I've heard thru the grapevine that they don't reccomend the VC-25 with the 220 psi pump because it pulls too many amps. Mine hasn't died yet but I'm keeping an eye onit.

[badass3000]

still cant figure out what the bottom left is.....

Its not on the Parts List

--Parts List:
Pump -150psi with two 3/8 elbow adaptors
VC-25 Variable Controller
2qt Reservoir
8ft. of Red High Pressure Tubing
Black Wire Loom
Installation Instructions
--Electrical Packet
In small bag:
1 Green LED
4 Blue Butt Connectors
3 Small Eyehooks
1 Male Connector
3 Female Connectors
Vacuum “t”
10 Tie Wraps
VC-25 Controller with harness
---Mechanical Packet
In small bag:
1 nozzle holder
7 #8x1&1/2in. Screws
7-#8 washers
4 #6x1/2in. Screws
2 Stickers
18” 1/8” tygon tubing
2-nozzles
1/8” NPT Tap

[jackhammer]

Originally Posted by badass3000

still cant figure out what the bottom left is.....

Looks like the check valve that you use if installing the nozzle after the throttle plate

[badass3000]

no, that would be this..

or

[Highboosted]

3 bullet things are the nozzles....thats an older pic, not what you get with their current setup according to the site.

[badass3000]

Oh yeah, I see, that exsplains it then. thanks

[DoctorDex]

While were on the topic of meth injection, just curious as to whether or not you have the alky system signal your fuel controller somehow, so that you fuel controller knows to pull fuel, so as to lean out the mix when your spraying meth? Or do you just run meth all the time, so there is no need to adjust your mix??

If you have rigged this type of system up, how are you sending a signal to the fuel controller? Does the pump only get voltage when you're spraying and if so, are you using this signal for your fuel controller (ie. via a relay).

Thanks.