Blown Alcohol + Nitrous Oxide

I am wondering if anyone has experience with blown alcohol and nitrous oxide. I understand Dale Armstrong was very successful with a similar set-up and was wondering if anyone else has knowledge of using Nitrous with a blown alcohol combination.
My thoughts were to use high blower overdrive then use the Nitrous down track with a retard device to kick back the timing. The enrichment fuel would come from the second pump on an older enderle dual pump drive with a loop back to set line pressure similar to how a carbureted alcohol car is set up with a mechanical pump. Some questions I have:

Best location to add nitrous (above/below blower)
Amount of timing retard per volume of nitrous.
Parts damage considerations
any other advice

I understand the NHRA limitations of this combination.

Thanks,
Dave

 

Dave,

You might want to contact Camp Stanley at http://stanleyandweissracing.com/. They're a great bunch of guys and I'm sure he'd help you out with the info.

I know they ran it last year on their Pro mod. Be sure to tell him Rick in Afghanistan said hi.

Rick

 

n20

Several ADRL pX teams use it with screw blowers. Most are very secretive but one I know used two dry nozzles in the back of the hat.
I was told no timing adjustment or enrichment hitting it only in high gear picked up .1 on a car that was already running 3.70's. Apparently, the bearings look better with N20.
X2 on Camp Stanley, he has everything out in the open.

 

I doubt a tenth by hitting it in high gear, but it does work. about 10 or 12 years ago i dropped a tenth in eight mile on a 4.50 car with an approximate 250 shot. I used gas to enrichen. sprayed in the hat full 1/8 mile.
Camp took it off his car this year, others run it still

 

blown alcohol and nitrous

Interested in your choice of enrichment fuel of gas instead of alcohol. Did you chose this because the system was calibrated for gas? Did you have any detonation problems?

Dave

 

Blown alcohol+Nitrous Oxide

Thanks to everyone who replied to this thread.
Dave

 

Blown Alcohol and Nitrous oxide

Thanks Rick I will send them and E-mail.

Dave

 

Nos

Take all the lean outs off and add nitrous when you would normally turn a lean out on. Would take a little work, but the results would be there.

 

N2O Works

This works just like Danny said. Use a pressure switch in place of the leanout set to come on when the pressure gets to where you want it. Now you only add N2O no fuel. I have used it with only one stage. Several are possible.

 

I didnt feel like figuring the correct ratio with high pressure alky, and variations w rpm and pump flows, so I used a el cheapo fuel pump from autozone and a 1 quart overflow tank for the gas.i have heard the gas works pretty well to enrichen. No issues. blew a nice header flame when purging thru the motor.
When I put it back on it would be a dry shot and maybe just close a leanout or something.

 

nos

Pinch valve, figure how much nos you wan to spray, then jet accordingly to enrichen the system.

 

Blown Alcohol+Nitrous Oxide

Where can I locate the pressure switch that will be 12-volts DC to activate the Nitrous solenoid. Also, would it be better to wire the system to go from an activation button on the steering wheel to the pressure switch so the Nitrous can be turned off easily if a problem is encountered on the run? Last, can anyone inform me of what a pinch valve is?

Dave

 

Adj fuel pressure switch

Nos make several adj pressure switches

 

Regards the question of nozzle placement (before or after the blower) - assuming the nozzles are after the blower, does anybody know how to calculate the fuel pressure increase required to overcome the blower pressure and achieve the same fuel flow as on a non blown motor?

For example, if an N2O FUEL jet has an area of 1 and a fuel pressure of, say, 10 PSI in a normally aspirated motor, what fuel pressure would be required to achieve the same fuel flow through the fuel jet at 15 PSI boost (assuming the same fuel jet area of 1)...

(I am assuming that because the N20 pressure is so great compared to the blower pressure, that no jet area change would be required on the N20 side).