OK, spomenul som si na to ako este vylepšiť zumotor. Myslím, že MPI vstrekovač je riešený ako vzduchový rozprašovač benzínu, tlak vzduchu a tlak benzínu. Podstatné, že má podobne ako striekacia pištoľ prívod plynu zdola aj zhora. Niečo podobné by som použil na zumotor. Aha, takto, plyn by mohol byť propán, a kvapalina nasýtený roztok NH4NO3, ale tlak propánu si ešte musím overiť, možno by nestačil.
Cieľom je chrániť steny piestu a valca a vôbec pred priamym stykom so vstrekovanou kvapalinou ako aj jej rozkladnými produktami. Ostatne tie rozkladné produkty pri styku s plynom tu spomenutým spôsobujú horenie a vývin tepla. Keďže ideme na čo najväčší výkon - náš cieľ, niekedy môže byť výhodnejšie mať ako spalný produkt CO namiesto CO2. Navyše by malo byť propánu viac ako stechiometrický pomer aj preto, lebo tam máme ešte nejaký zvyšný nespálený vzduch.

A to najlepšie na záver? Pomer palivo/okysličovadlo je ľahko a pevne nastaviteľný, vyskúšateľný vo voľnej prírode. V podstate je to raketový motor. Druhá vynikajúca vec je nastaviteľná doba horenia. Rozmýšľate tuho ako na to? Jednoducho, nastavením parametrov rozprašovania sa dá nastaviť veľkosť kvapiek a/alebo aj ich penetrácia a tým jeden zo základných parametrov horenia. Vyšším tlakom plynu dosiahneme lepšie rozprášenie a aj lepšiu distribúciu kvapiek.

Nemôžem sa dočkať vyskúšať to v praxi.

English version: Allright, I came with an idea how to improve the zumotor concept. I think that MPI injector for example is designed as a combined petrol spraying device with a petrol input and an air input. The important thing here is to have two air inputs in the top and bottom part of the injector, just like any paint spray-gun. I would like to use something like that on the zumotor. Now to explain its use: The gas could be propane and the fluid high-temperature saturated ammonium nitrate solution. Propane is easily available, but I have to re-check the useable pressure. It can be stored in liquified form, and gasified and heated directly in some upper part of the injector system with engine temperature. Remember, that we only need it to work with fully-heated motor.

We want to protect the walls of the cylinder and lining from the decomposition products of the ammoniun nitrate, since it is highly reactive. Well, that is good, since we have lots of hydrocarbon gas to burn it with (that is the purpose of the outer gas inlet, like in a spraygun). We want to use more gas (mixture ratio) than needed to burn with the nitrate for three reasons: to get some more heat, since there is lot of water vapour, there is some residual oxygen, plus for pressure, we like lighter molecules better so having CO molecules instead of CO2 molecules offers some advantage, and at this time we only care about maximum power we can possibly get from the system (CO may be also useful later, it can be burned with other residues on a catalyst before a second turbo maybe?).

The best thing of it all? The fuel/oxidiser ratio is easily fixed by tuning the injector, and you can try it out outside of the engine for burning performance. It has become - in fact - a rocket engine. The other outstanding property of this design are the burning properties, which can be set on the fly by changing the oxidiser droplets size and distribution, penetration. In ordinary gas powered sprayers this is done by changing the gas pressure.

I can't wait to finally try it sometimes. Yes, I will be insured by that time.

EDIT: propane properties - Autoignition temperature : 470 °C, oh how I love thee.
at 65°C - 25bar, 85°C - 37bar pressure. That could almost suffice.

• Critical temperature : 96.6 °C
• Critical pressure : 42.5 bar

General supercritical fluid properties: ability to diffuse through solids like a gas and dissolve materials like a liquid, heat of evaporation is zero. This well helps combustion properties, I just don't yet have a definite answer to the heating to such high temperatures reliably.

Cieľ je taký aby sme skladovali skvapalnený plyn pod nízkym tlakom, ľahko s ním manipulovali a presne dávkovali do splyňovača kde vznikne prehriata para s vysokým tlakom (trochu amatérske a navyše zase potrebujeme dávkovacie/vstrekovacie čerpadlo). Tlak v spaľovacom priestore je už okolo 30barov. Iná možnosť je mať kontinuálny splyňovač kde už bude pripravený plyn s vysokým tlakom a my budeme ovládať plynový ventil (neznáma hustota prehriatej pary??). Ani jedna možnosť sa mi nepozdáva.

Waiit... let's think about it again please? So, we have a liquid on input and we need an inline fuel injector pump? The car already has one! I could as well try putting LPG to the pump an try it with a regular injector! This way we would keep the inline injector for the whole ride, and the engine would be eating the lpg/propane all the time. Only the injector would be two-part. First, the valve that would open at some pressure, then the heated gasifier which leads to a spray-type nozzle. Good thing is as any painter knows that by not supplying the paint (oxidiser in our case) you suck the remainter of the fluid from the nozzle and clean it. This would be nice.