Edis wrote:flynfrog wrote:water methanol injection is used on NA cars to cool down the intake charge. I cant rember what car it was I belive a for prototype mustang used the AC compressor to chill the water before injection. They might have also used this on a Euro spec focus. Its all a little hazy right now.
Water and methanol provides cooling mainly by their high heat of vaporisation. That means chilling the liquid has little effect on the cooling provided by the liquid. It also means that the cooling provided below the boiling point of methanol will be small.
A 'boost fluid' is mostly effective at cooling the charge and the engine itself inside the cylinder. This reduce knock and higher boost pressures, higher compression ratios, leaner fuel mixtures and/or more ignition advance can be used.
Ethanol evaporates only about two degrees lower than Methanol and way below the boiling point of water. You should check out Lotus Engineering and their two stroke variable compression, variable valve, variable fuel engine.
Almost everything possible for tuning both two stroke and four stroke engines has been done years ago. In fact the American V8 engines are closer to the steam age than to modern day.
Even Lotus were experimenting with cut away running engines, for all these issues decades ago. Little has changed, in fact the Bristol sleeve valve engine of WW2 although limited on rpm would still adapt better than most modern ideas.
The reciprocating ic engine is after all, very very mechanicaly inefficient.
I much prefer the Stirling. We have a small one that runs on anything hot and can generate 1KW, brilliant. I believe that for ic future, we should concentrate on making the Wankel rotary more fuel efficient. It is already as good as it gets mechanicaly.
As to intercoolers, they are only used because the charge temperature from turbocharging would be to high otherwise. Basicaly to cure a problem, not improve anything. Better to use the exhaust energy to drive a generator in an energy recovery system. That way no hot intake.