methanol injection

['70-Challenger]

So what is this in?

The way water/meth. injection works is the water stabilizes the A/F mixture and prevents detonation so you can make more power by turning up the boost and ignition timing. For just the cooling effect you should use straight distilled water. because you don't need the high octane fuel like methanol. It does provide an evaporateive cooling measure... But not a whole lot.

And how hot does it get in the summertime?

its in my 74 dart. and oh you can use just water? ahh i didnt know that. okay so maybe i'll do water injection now, and then use methanol/water when i put in a turbo. the engine gets pretty warm, just like all engines, but i am more worried about the position of the exhaust manifold. since its right under and beside the intake manifold.

 

[roccodart440]

The methanol adds power, also adds a fuel, keep that in mind. My experience with water/meth injection is on diesel apps. EGT's are an issue as you increase performance. More fuel, more power but increased EGT's. Water/meth is a nice mix of the two. It is always run either straight wter or blended on a Diesel. Never straight meth.

 

[Shaker223]

I run straight meth on my Turbo slant. 10gph.

As said before, it allows more timing to be run with boost because it helps reduce the air temps and avoid detonation. Additionally, it can add a little octane.

 

[bjkadron]

Yeah, they first started using it on fighter planes so they could have a higher ceiling before getting detonation. Straight water (distilled) will work great for your goals. For boosting it you can use windshield washer fluid as a cheap way to get the methanol.

 

[66aCUDA]

I agree with BJ. If you stay NA just use water. Then if you move up to Boost then spray methanol. You will want to use a small jet on straight water. It will keep your engine clean of carbon
Make Darn sure your engine is set up properly BEFORE you use the injection as it can hide bad problems.
Frank

 

[Charrlie_S]

I don't agree. Water/meth injection is not used to cool the intake charge, it is used to suppress detonation. If you do not have detonation, the injection system will take power away, by displaceing the oxygen and fuel reaching the cylinders. Water doesn't burn, and meth has less heat(power) content then gasoline. You would have to have a VERY high compression ratio on a normally aspired engine, to benefit from W/M injection. However it does work well on boosted applications, IF IT IS TUNED PROPERLY. It is not plug and play.

Someone posted about nitrous, and CO2. That can be used to spray an intercooler, but do not let it get into the carb. CO2 will not burn and will cost HP. N2O will lean the mixture, and cause internal engine damage, if fuel is not added, also.

 

[Shaker223]

Water/meth injection is not used to cool the intake charge, it is used to suppress detonation.

Water/Meth gives a cooling effect to the intake charge thus suppressing detonation. The mixture (finer the better because of more surface area of the individual droplets) absorbs the heat (cools the charge) out of the incoming air charge and in turn reduces the tendency for detonation.

 

[bjkadron]

I don't agree. Water/meth injection is not used to cool the intake charge, it is used to suppress detonation. If you do not have detonation, the injection system will take power away, by displaceing the oxygen and fuel reaching the cylinders. Water doesn't burn, and meth has less heat(power) content then gasoline. You would have to have a VERY high compression ratio on a normally aspired engine, to benefit from W/M injection. However it does work well on boosted applications, IF IT IS TUNED PROPERLY. It is not plug and play.

Someone posted about nitrous, and CO2. That can be used to spray an intercooler, but do not let it get into the carb. CO2 will not burn and will cost HP. N2O will lean the mixture, and cause internal engine damage, if fuel is not added, also.

Water/Meth gives a cooling effect to the intake charge thus suppressing detonation. The mixture (finer the better because of more surface area of the individual droplets) absorbs the heat (cools the charge) out of the incoming air charge and in turn reduces the tendency for detonation.

Actually you are both partially right..
although the water injection does provide a slight cooling effect from the atomization, its main purpose is to suppress detonation. While I don't think it would help a regular engine (non high compression) I don't think it will hurt it unless you sprayed a BUNCH in.

Also good point about not getting the CO2 and N2O into the engine... You are better off with a water to air intercooler at that point. or just using a N2O shot (with the appropriate fuel mixture of course).