> You are probably seeing the same sort of performance change that one gets= using 'water injection', a scheme whereby a very small quantity of water i= s added at the air intake by an atomiser. Without comment on the role of herring, water injection can reduce the octa= ne sensitivity of a normally aspirated IC engine sufficiently that a lower octane fuel (cheaper, usually) can be employed. I'm reasonably sure about this, because a VW Bus I ran around back in the day sported a 10:1 compression ratio, and ran fine on 87 octane gas, with D= IY water injection. I was in the business, and charging up steep grades at 70 mph, passing Dats= uns in a VW Bus, sold engines :) Jack On 2/12/11, John Gardner wrote: > Hi Joe - > > More than your buddy may wish to know... > > http://www.amazon.com/Internal-Combustion-Engine-Theory-Practice/dp/02627= 00263/ref=3Dsr_1_1?ie=3DUTF8&s=3Dbooks&qid=3D1297565774&sr=3D1-1-spell > > http://www.amazon.com/Internal-Combustion-Engine-Theory-Practice/dp/02627= 00271/ref=3Dsr_1_2?ie=3DUTF8&s=3Dbooks&qid=3D1297565774&sr=3D1-2-spell > > SIr Harry Ricardo's works are seminal; Prof. Taylor's works are more > recent. > > Water injection is usually employed to reduce octane > sensitivity/charge-air mixture > temperature - Pretty much interchangeable in IC engines... > > If your buddy's app is supercharge/NO2 injection he needs to do the math. > Or have very deep pockets. Or pay someone who has done the math (slightly > less expensive, occasionally). > > HP Books published a number of related "cookbook" pubs once upon a time - > Worth reading if you can find them. > > A sometimes insufficiently appreciated gotcha is that if your WI system c= an > pump/syphon water into your cylinders while the engine is shut down, the > re- > sultant "hydraulic lock" will likely destroy the engine, next time it's > started. > > Jack > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .