Location: Down south where the air is wet, red clay rules...Dixieland
Posts: 140
Re: latest hoax/scam
Didn't they use a H2O injection on WW11 fighter planes?
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it's a water/methanol mixture injected into aircraft engines. some turboprops still use it.
it lets you run higher compression ratios.
If memory serves....VW experimented with some water injection in the late 70's. Basically just an orifice that allowed engine vacuum to pull a light mist of water into the intake. No idea why they didn't proceed but I'm guessing it simply didn't yield good enough results.
The theory on water injection (or water/methanol) makes good sense, watch drag racing for awhile. Those guys always want cool/mild temps and fairly high relative humidity to squeeze the most out of their fuel. The hotter and drier the climate, the slower they run (a bit of generalization I'm sure, but stats tend to lean toward this).
The cooler the intake charge, the more molecules of oxygen get into the cylinder per any given volume. The water/methanol allows the intake air to be cooler as well as providing some extra combustible material. Straight water tends to just cool the intake air and help atomize fuel droplets as well.
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'scuse me while I whip this out.
Water/methanol injection is a completely different concept. A supercharger or turbocharger compresses the intake air, which causes it to heat up. While it is not necessary to cool the intake charge, it is generally beneficial. With water injection, liquid water is sprayed into the hot intake during wide open throttle.
It takes a lot of energy to convert water into steam. That energy goes from the air to the water, cooling off the air. However, once the steam is in the cylinder it does not take much energy to heat it up so it has a relatively small effect on lowering cylinder temperatures. Another benefit is that it increases resistance to knock, which would be equivalent to raising the octane of the fuel. One more benefit is that it will keep the inside of the cylinders clean.
If you want to go look this up, you want to look at the Heat of Vaporization and the Specific Heat of steam. The amount of water doesn't have to be perfect, but the idea is to get it fully converted to steam right at combustion.
It may also be used on NA cars where it is used to prevent the air from heating during the compression stroke.
Methanol can be added for two reasons. First, it's a high octane fuel. Second, it keeps the water from freezing in the tank.
As a consulting engineer, I always get a chuckle when magic gadgets like this are talked about. I then get a headache when folks defend it
There are a lot of claims out there about magic efficiency gains. I do know the pulp and paper industry is really struggling right now, it may even disappear. They have tried - in good faith - a lot of the hocus-pokus bulls*** and guess what? None of them worked
I really do hope somebody eventually invents a little gadget like Mr Fusion that allows us to flip off and laugh at the Mid East countries. In the meantime, all I can suggest is that if this thing really does work - the price seems right - then try it out. I won't, I'm not going to waste my time
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What we really need is workable cold fusion. Preferably something that would produce large amounts of heat energy from something we have in abundance like zucchini and baking soda. Sun Fusion with a fusion reactor under the hood!
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Jayman, how many times are you going to mention you're an engineer so people will think your opinion matters more? Are you hoping they won't notice that "engineer" is a wonderfully vague term that isn't a title authorizing someone to speak on all things machine-based?
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