Solenoids can and will put a drain on your electrical system. What would you think about a pneumatic operated nitrous valve ? 

Click on the link below and read this excellent article and review by Dave Koehler.

  http://dragracingonline.com/technical/vii_12-cf-1.html

You can visit Koehler Injection and view this product @ http://www.koehlerinjection.com/Koehler/Comboflo/comboflo.htm

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