Pre turbo water injection

[GreenV8S]

Water has a higher latent heat of evaporation, but you can only evaporate a finite amount of water before the humidity reaches 100%. Methanol evaporates better at low temperatures, and if the water humidity reaches 100% you can still get methanol to evaporate (until the methanol reaches saturation). Methanol also has a higher octane rating than petrol so helps nudge the overall charge octane rating up.

[annodomini2]

GreenV8S said:

Water has a higher latent heat of evaporation, but you can only evaporate a finite amount of water before the humidity reaches 100%. Methanol evaporates better at low temperatures, and if the water humidity reaches 100% you can still get methanol to evaporate (until the methanol reaches saturation). Methanol also has a higher octane rating than petrol so helps nudge the overall charge octane rating up.

I thought methanol was illegal for road use?

[GreenV8S]

annodomini2 said:

GreenV8S said:

Water has a higher latent heat of evaporation, but you can only evaporate a finite amount of water before the humidity reaches 100%. Methanol evaporates better at low temperatures, and if the water humidity reaches 100% you can still get methanol to evaporate (until the methanol reaches saturation). Methanol also has a higher octane rating than petrol so helps nudge the overall charge octane rating up.

I thought methanol was illegal for road use?

Based on what law?

[chuntington101]

GreenV8S said:

Water has a higher latent heat of evaporation, but you can only evaporate a finite amount of water before the humidity reaches 100%. Methanol evaporates better at low temperatures, and if the water humidity reaches 100% you can still get methanol to evaporate (until the methanol reaches saturation). Methanol also has a higher octane rating than petrol so helps nudge the overall charge octane rating up.

Green, is that really true that even at 100% humidity methanol can evaperate???? its just i read somewhere that if you ran say water injetion pre turbo to get 100% humidity and then post turbo (post intercooler if you still had to run one) meth injection upto 100% saturation, you could then run a third chemical for even more cooling. is this true???

also if the water droplets are small enough do they stay suspended in the air? i was thinking like a cloud. this would help with the pre turbo bit wouldn't it?

[chuntington101]

annodomini2 said:

chuntington101 said:

Wedgepilot said:

I looked into this a few years back, and I'm pretty sure the best place to spray was just after the intercooler. The finer the spray the better, so powerful pumps running high pressure are the order of the day.

The water lowers the temperature, plus the presence of water itself helps delay pinking/knock by slowing the flame front.

It's very common in diesel tractor racing in the US (I kid you not), and IIRC, the RAF did some research into it back in the 40s for their supercharged engines.

WW2 aircraft actually used a 50/50 mix of alky and water from what i have read. Red dragon (P51 Mustang with a Griffin engine) ditched the original aftercooler and ran pure water/meth injection to cool the intake. also you have to remember that they ran a MASSIVE carb PRE turbo. wonder what effects that had on temps???

Cheers

Chris.

The merlin and griffon are Supercharged, but the effect is the same.

DAM IT! sorry mate your right its a massive great supercharger. sorry that was me typing and not thinking! lol

Chris.

[GreenV8S]

chuntington101 said:

Green, is that really true that even at 100% humidity methanol can evaperate???? its just i read somewhere that if you ran say water injetion pre turbo to get 100% humidity and then post turbo (post intercooler if you still had to run one) meth injection upto 100% saturation, you could then run a third chemical for even more cooling. is this true???

Yes, it's true. Even if the air has reached 100% humidity of water vapour, other fluids can still evaporate.