Water / Methenol injection theories Options

[awd4kicks]

I've been reading up on WI and the findings listed show that there is little or no beneficial gain from running more than 50% methenol to water when injecting it in the engine as an anti-detonation remedy. I know Spy is running straight Meth and I now have a good source for straight meth for my personal use, but if there is no gain for using more than a 50/50 mix I might as well make it last longer.

Does anyone have any information that supports or contradicts this information. My information is from a good but dated source: HPBooks' 'Turbochargers'

Thanks for any input on this.

[awdnot2]

What spy said provided the your injector for the meth is large enough.

[natedogg]

Agreed. Thermodynamics tells us that the latent heat of evaporation of water is higher than most fluids. That is why it is so good at cooling. It takes a lot of heat to force the liquid water to change state into a gas. The meth is raising your effective octane. That is why you pull fuel out while the meth is being injected.

[awd4kicks]

Yes the graph listed, did show that the level of fuel required did drop as Meth was added. This still had no additional effect to prevent detonation beyond the 50/50 mix from what they were sying though. They stated that meth, being a fuel has it's limit for predetonation as well.

I'll see if I can scan that graph in tonight and post it up for reference.

[awd4kicks]

Here is a scan of the chart from HPBooks 'Turbochargers' book showing what we are discussing. The chart doesn't differentiate between straight methynol and a 50/50 mix like I remember, but it does show how water injectionsupresses predetonation further than simply richening the mixture ... to a point.

I'll look for the paragraph that mentioned the lack of benefit from straight meth.

Attached File(s)

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