I have come across a good paper on WI/Al injection -

[Richard L]

http://enginehistory.org/Frank%20WalkerWeb1.pdf

Richard

[C6C6CH3vo]

Isopropyl doesnt vaporize fast enough and becomes fuel - richer.

I may replace the crap with ethyl in my methyl/water/IPA concoction

[Richard L]

I was surprised about the iso-propyl.

Wonder if there are any one has experienced this currently? I mean for the last few years?

[AWDPowah]

Very interesting, nice find.

[Richard L]

Originally Posted by AWDPowah

Very interesting, nice find.

Hotrod from the NASIOC forum posted this link.

[C6C6CH3vo]

They only used the alcohols to keep the water from freezing, the water was the antidetonant. The isopropyl mix was the only one that burned at antifreeze levels during injection making the engine run like crap (rich), and ethyl and methyl alcohols did not.

If water, with it's latent heat of vaporization, stops knock the best. Then by what mechanism does methyl alcohol give us the results we are seeing?

Is it that water thermally pulls heat conductively and the methanol cools surfaces (endothermically) from it's accelerated evaporation rate and a higher flash point (octane), making it give better results? Methanol does have a low boiling point and at altitudes even lower.

[Richard L]

I am not sure, most of his research were done on land.

I do not have knowlege of explaining what was going on during comnbustion.

Richard