Injection Mixtures 101
Nov 11, 2009, 08:48 PM
#18
Just like a majority of all alky's, meth can act either acidic or basic in behavior. Its got a pKa of about 15, it will be a slightly weaker acid than water, yet it will still able to react with strong bases like hydrides, or with materials such as sodium metal. With meth it will attack the oxide coating that protects aluminium from corrosion. Therefore acting like an acid.
Again I'm trying to keeping it more basic and simple for the general public to understand.
Evan Smith
Mar 18, 2010, 12:17 AM
#21
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Also meth has a better atomization than water allowing for more heat to be removed from the air allowing cooler air intake temps.
[...]
Water provides the most effective cooling due to its great density and high heat absorption properties. Water has the second highest specific heat capacity of any known chemical compound on earth! This allows for cooler in-cylinder temps and exhaust gas temps and far superior knock suppressing than anything else!
[...]
Water provides the most effective cooling due to its great density and high heat absorption properties. Water has the second highest specific heat capacity of any known chemical compound on earth! This allows for cooler in-cylinder temps and exhaust gas temps and far superior knock suppressing than anything else!
Thanks!
Mar 18, 2010, 01:41 AM
#22
Methanol's viscosity at .59 and water at 1.02 its almost 2x's more easy to evaporate and atomize meth than H20. The process from going to a liquid state to a gas is when it removes the most amount of heat. Therefore water wont do as good of a job till its in the cylinder and is completely evaporated. Water injected at half the amount of meth will do a better job at cooling but it changes where the cooling is occurring either in the IC pipe or cylinder. Hence with a 50/50 mixture you get the best of both initially for most setups.
All this really depends on jet placement, and environment. Currently I am running over 840CC of 100% H20 on 87
octane with 2.0 Bar of boost from a GT35R HTA!! no knock and EGTS are below 800C 
Evan Smith
Jun 13, 2010, 06:37 AM
#24
Do the reduced EGTs with water come from running increased timing and leaner mixtures, or directly from the water? I'm setting up my HFS-5 and with 100% water I'm seeing no change in my EGTs with my usual pump gas tune. I've confirmed that it is spraying.
Jul 11, 2010, 05:00 PM
#30
100% H20 is a hard task with one jet as the distribution of it is a lot harder than with a 50% mix.
Evan Smith