Low on power after driving through flood!

[Snax]

I think you are confusing water injection as a standalone addition vs. being used to intercool and actually quell detonation in boosted motors - in conjunction with careful fuel and ignition tuning. On a healthy motor that does not tend toward detonation, you are absolutely correct in that water injection does nothing but displace air. The only motors that can truly benefit from water injection are those running boost pressure from a turbo/supercharger with inadequate intercooling. It provides a little extra room to work with that adding more fuel will not fix, while avoiding the need to retard timing or throttle.

There is no reason to use it on normally aspirated motors of any sort however since issues of detonation with high compression motors are not intercooling problems, and therefore the cooling effect of the water vapor is drastically reduced and moot to performance.

Hugh McInnes book 'Turbochargers' offers a terrific primer and explanation of this stuff, and Corky Bell's 'Maximum Boost' takes it to even greater depth.

I am of the mindset however that water injection is essentially a band-aid to substandard design, to having run completely out of room to make other intercooling improvements, or for getting by on low octane fuel.

But we digress.

[hberdan]

Maybe the 3AC could use a booster system!

http://www.alcoholinjectionsystems.com/ ... _info.html

[takza]

I used 91% isopropyl last summer at 2.5 oz / 10 gallons gas for a 10 mpg gain...35 mpg. Using it this winter also.

Also testing 50 / 50 mix of water and iso where I am bubbling air thru this mix.