Actual jet size???????

[SideSlip]

Does anyone actually know how big their alcohol nozzels in use are? The SMC kits, as far as I'm aware, number their nozzels like #7 or #14.............which doesn't seem to mean much. How big is it really? .025....... .028...... .030 and at what pressure? Is it an oil furnace jet, or NOS jet, or pressure washer jet?


I'm trying a do-it-yourself combo running a 100 psi SureFlow pump. I've been investigating different nozzels for spray atomization and uniformity on a flow bench. The best I've seen to date is a #2- 40 degree pressure washer jet. Awesome atomization across a wide field. I'm not impressed at all with the pattern from the NOS 90 degree fan body with an .030 jet suggested on the DIY alcohol site (no offence intended-JMHO).........first of all the fan outlet is about in the middle of the up pipe and it fires the mixture at the far side of the tube (as they all do, but the NOS starts firing in the middle, so its got a serious jump on hitting the far wall before being atomized by airflow). The NOS fan body was placed as far down as the intercooler neck, and at about a 4500 RPM run on a 3.8, flow-wise(the most I could get), nearly the entire volume of alcohol was collecting on the up pipe wall PRIOR to reaching the throttlebody. ---UGLY--- Atomization is relatively poor as well, so this would hurt even manifold distribution. Any idea what size the average SMC nozzel is, and at what PSI? I'm just trying to compare real world success with what the flow bench shows. ------In the persuit of knowledge------no flames please! Thanks.

 

[blackbuick87]

.030 is a pretty big jet. Also in your testing at 4500 rpm, how was this done? was it 4500 rpm under vacuum or 22psi of boost? BIG difference there.

My Jay Carter kit did not even come with an .030 jet, .025 was the biggest. With a smaller jet you should get better atomization.

 

[SideSlip]

The flow rate was approx. 600 cfm+-.......an addapter plate was made(duct tape wonder). As far as I'm aware, boost pressure in the manifold is not dependant on motive flow. While it requires flow to build pressure, at a fixed pressure, flow rate should stablilize fluctuating with RPM. Corrections are welcome, but the point of the test was to determine where the alcohol went and in what form. This will vary with flow, but I think its fairly representitive. We all know that the smaller the droplet size, the easier vapourzation occurs. This has two benifits, 1) the process cools the intake charge, 2)allows for a more even distribution, because vapour acts more like air than a liquid. (we all know this though).

Regardless of flow rate, the jet that atomizes the finest, and allows for a wider distribution into the airflow will simply perform better. The NOS jet did not impress, I think this was due to the fact that the jet is in the base if the fan body. The alcohol flows through the jet itself at pump pressure, then enters a relatively wide channel .070? (which effectively drops pressure dramatically), travels up the fan body to exit half way toward the opposite wall. I have no idea why it works as well as it does for some.

 

[Lee Thompson]

nozzle

I made my own alky system. After many different nozzles and jets, which didn/t atomize well, I installed Aquamist nozzles this past winter. I use a 2 stage system, 3 ---.040 mist nozzles spraying at 80 psi. I measure my alky usage after each 1/4 mile run----6 ozs. per run. Ever been to a grocery store and see the mist that they spray over vegtables. That is the way these nozzles spray as I have hooked them up on a work bench.

 

[Keith Ashcraft]

Aquamist nozzles are a little expensive but well worth it. You can access the products thru www.kcsaab.com Brad is the guy you want to talk to.

Keith