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What is Methanol Injection & How Does it Work on a Mustang?

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If you're considering a methanol injection system, odds are your Mustang is heavily modified or it soon will be. With turbo and supercharger kits widely available, don't hesitate to browse.

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Methanol injection was originally deployed in war planes (circa World War II) to briefly increase power during take-off, particularly on aircraft carriers where runway length is very limited. No longer reserved for the war birds of old, methanol injection is a great way of increasing power and controlling detonation on a supercharged or turbocharged Mustang.

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What is a Methanol Injection System?

  • Methanol injection is a water-methanol mixture to help reduce intake temperatures
  • Forced induction Mustangs see more intake heat, and benefit greatly from methanol injection
  • Methanol lowers temperature by up to 100 degrees Fahrenheit
  • Methanol also steam cleans your engine because of how quickly the water vaporizes
  • Methanol is injected much like your Mustang’s fuel
  • Methanol systems are compatible with pump gas Mustang builds
  • There’s not enough water in the mixture to harm your engine either

In a nutshell, a methanol injection system (technically it is a ‘water-methanol’ system, but the aftermarket has shortened it to simply ‘methanol’) is a mechanical system installed on your Mustang to inject a water and methanol (methyl alcohol) mixture into the intake manifold. The system is comprised of a reservoir to hold the methanol, a pump, nozzle, and a digital controller to oversee delivery. The injected liquid is a mixture of water (yes, water) and methanol. These systems are typically installed on forced induction Mustangs, meaning Mustangs with a supercharger or turbocharger. Due to the forced induction, supercharger or turbocharger equipped Mustangs see higher air temperatures and cylinder pressures and thereby face greater risk of detonation versus a regular naturally aspirated motor.

What are the Advantages of Methanol Injection?

There are two primary advantages of methanol injection. The first is that methanol injection lowers air charge temperatures by a considerable amount – up to 100 F. Secondly, methanol injection reduces the risk of detonation, which can be an engine killer. The combination of these two advantages can allow you to safely increase timing and boost on your engine and make more power! There is another, less talked about advantage as well. Even though you are injecting water into the engine, it is vaporized immediately into steam. This steam then acts like a cleaner and steam cleans the cylinder chamber and piston top. Furthermore, this steam also pushes down on the piston (like a steam engine), adding more energy to the power stroke and consequently delivering a little bit more horsepower. Methanol also has a tendency to absorb heat out of the air. Something known as “latent heat of vaporization.” The water also absorbs heat and provides a further cooling effect as the finely mist of water/methanol mix is pumped into the engine. The cooler, denser intake charge reduces the chances of detonation, as the high-octane methanol boosts power. In summary:

  • More power 
  • Cooler intake temperatures allow you to run more aggressive timing and/or boost (forced induction applications)
  • Reduced chance of detonation
  • Low cost: Water/methanol systems start around $300.
  • More economical for the street: water/methanol is a less expensive high-octane alternative to pure race gas for guys running high compression engines on the street
  • The atomized water effectively steam cleans the valves, valve seats, and even the piston tops and intake, reducing carbon buildup
2005 and a 2009 Mustang at the Track

How Does it Work?

As mentioned previously, the basis of the system is to inject methanol via a nozzle into the intake manifold. The spray from the nozzle is so greatly atomized (a very, very fine spray pattern) that the methanol vaporizes nearly immediately. When the mixture goes from a liquid to a gas it undergoes what is called an endothermic transformation, where it absorbs heat from the surrounding air, decreasing the air temperature by as much as 100 F. With the air now cooler, it also makes the oxygen denser, meaning more oxygen will be entering each cylinder. With more oxygen present, more fuel can be added too for more power. Furthermore, this cooler air charge will slow down the combustion rate, decreasing the chance of encountering detonation. With cooler air temps, less cylinder pressure and detonation unlikely, we can further increase the timing and boost of our forced induction Mustangs! That’s not all; it gets better. All of this can be in effect whilst still running pump gas.

Water in My Engine, Are You Crazy?

It sounds crazy, but in fact, there is no inherent danger to your engine from running a proper methanol injection system. The water content will never be in sufficient quantities nor in liquid form for a lengthy enough period to harm or corrode your Mustang. Recall the spray pattern via the injection nozzle is so atomized vaporization is nearly instant. Combusted then turns it to steam which all exits on the exhaust stroke- no wet residue left behind.

Snow Performance Mustang Resevoir

Should I Install a Water-Methanol System on my Mustang?

For a naturally aspirated engine, there isn’t enough of a benefit to warrant installing a methanol injection system. However, if your Mustang is supercharged or turbocharged or you plan on doing so in the near future, a methanol injection system is a great idea. By no means is it absolutely necessary, but lowered intake charge temps as well as a reduced risk of detonation is not only good for performance gains, but for ease of mind as well.

What Ratio of Water-to-Methanol is Recommended?

A 50/50 ratio is recommended, although ratios of anywhere from 30 percent to 50 percent methanol work well and deliver excellent octane gains and cooling. The 50/50 ratio has been demonstrated to be the best for charge/air cooling, excellent detonation control, and safety. It should be noted methanol is easy to ignite and burns with a nearly invisible flame. For that reason, any ratio that far exceeds the recommended 50/50 ratio can be hazardous.

A 50/50 water/methanol will provide all the density increase/detonation control needed to handle up to 30 psi of boost. However, an intercooler and water/methanol injection together would provide even greater benefits, especially beyond 30 psi of boost.

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