Dear Friends;
I would like to ask few obvious questions (sorry if I missed answers in discussion topics)
1, What is near to ideal compression ratio for burning hho gas in combustion engine? (4 stroke with injectors)
2, What side effects happen on combustion engine after running hho for long time?
(Rust on exhaust valves?)
Ladislav
I know the comp ratio in a diesel engine is just a little too high and a gasoline engine is a bit too low, so somewhere right around 15:1 seems optimum if you keep close watch on the temperature. Auto flash point is what you adjust on. You want the fuel mix to be real close to this flash point, but never above it under worst conditions. That way you get an easy ignition and the ignition triggers when you want it to instead of when it does. There is also another factor to consider...
With a gasoline engine, you can pump as much fuel into the cylinder as it can handle, but with HHO it is not likely you can make enough of it to keep up with the engine demand. In fact, very unlikely that you could actually blow the engine up. This means that when running HHO, you pretty much want the load constant, then setup your fuel delivery to match. So it would appear that HHO wouldn't be a very good fuel for something like an automobile with constantly changing load conditions. With something like a generator, yeah, it would probably work quite well. And if the load conditions are relatively static, then you could bump up the compression ratio to some optimal value. One more thing to consider though, ignition timing.
With HHO, you have a pretty fast burn, which means you probably want to trigger the ignition AFTER top dead center. When you do that, you just wasted a fair chunk of your compression. With a quick burning fuel, you want to place the majority of the expanding gases right around 90 degrees after TDC--that's the mechanical point in the stroke where you have the maximum leverage on the crankshaft and can develop maximum torque. So lets say you fire at 50 degrees ATDC and the burn lasts to about 130 degrees ATDC. You will capture the majority of the kinetic energy. But look what you did to the compression firing that late. You wasted all the energy to smash the gas down tight, then let a bunch of it release 50 degrees ATDC. That's energy you mostly just converted to heat and did no useful work with.
Hence, the reason for using direct injectors. Inject rapidly just prior to ignition. So what you want is basically a hybrid between a gasoline engine and a diesel engine. Direct inject ATDC near the ignition point, fire, then collect as much energy as you can. So if you think about an engine with one exhaust valve, no intake valve, a direct injector and a spark plug would be the most ideal method to turn HHO into rotating mechanical energy. Take that idea and go a little further and ditch the whole piston engine design. Use a turbine chamber instead. Boots-2b1 has designed just such an motor made specifically for HHO:
http://open-source-energy.org/?tid=833&pid=10639#pid10639
The first side effect I have run into is water mixed in the engine oil. You either have to have very extensive crankcase ventilation or very good piston rings. And yes, you can get rust. Titanium valves with an all aluminum head would likely last longer than anything with steel in it.
And welcome aboard Ladislav. Hope I was able to answer your questions.