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Turbocharged · 07-13-2006

I built my kit for about $150. I run a 50/50 mixture of methanol/H2O.

As we all know, our cars run rich under WOT to dissipate heat and prevent knock (over 50% enrichment if you are flowing more than 2.7 g/rev). This fuel is not burnt and is only added to displace heat. Unfortunately, gasoline is not effective at quenching heat and preventing knock. Water and methanol have considerably higher latent heat of vaporizations compared to gasoline and therefore quench more heat than gasoline. By injecting water/methanol into the cylinder you can remove a great deal of gasoline that isnt being burnt in the combustion process. This lowers combustion temperatures and slows the flame front (much like race fuel). This means that you can run more boost and advance timing.

Water has a greater latent heat compared to methanol and methanol is basically an octane booster. Some people have more success with 100% H2O while others have more success with a mixture of methanol and H2O. Keep in mind that methanol burns in a 6.5:1 ratio, so your desired A/F ratio will decrease.

These setups are perfect for street cars that run on pump gas and run high boost.

07-13-2006	#13
Turbocharged Join Date: Jun 2006 Location: Minneapolis Posts: 42	Re: aclh/meth/water injectio I built my kit for about $150. I run a 50/50 mixture of methanol/H2O. As we all know, our cars run rich under WOT to dissipate heat and prevent knock (over 50% enrichment if you are flowing more than 2.7 g/rev). This fuel is not burnt and is only added to displace heat. Unfortunately, gasoline is not effective at quenching heat and preventing knock. Water and methanol have considerably higher latent heat of vaporizations compared to gasoline and therefore quench more heat than gasoline. By injecting water/methanol into the cylinder you can remove a great deal of gasoline that isnt being burnt in the combustion process. This lowers combustion temperatures and slows the flame front (much like race fuel). This means that you can run more boost and advance timing. Water has a greater latent heat compared to methanol and methanol is basically an octane booster. Some people have more success with 100% H2O while others have more success with a mixture of methanol and H2O. Keep in mind that methanol burns in a 6.5:1 ratio, so your desired A/F ratio will decrease. These setups are perfect for street cars that run on pump gas and run high boost.