Quote:
Originally Posted by serialk11r
We're kind of veering off topic since none of this is stuff is realistic DIY mods, but IIRC a problem with stratified charge is that the leaner areas don't burn well and the fuel there is sort of wasted. A higher energy ignition system, preferably that ignites the cylinder at multiple points, that can ignite a more homogeneous lean mixture is optimal.
|
Super lean is going to create areas that don't burn well one way or another. The stratisfied charge actually helps because the rich area creates a hot quick flame in one part of the cylinder that helps ignite the adjacent lean pockets.
Also some crazy efficient lean burning concept engines use the rich area to jet out into the lean areas by putting it in a sort of precombustion chamber with small holes that shoot jets of flames into the combustion chamber.
Some also do away with the stratisfied charge and use just a precombustion chamber that does the same thing I wonder if it would be feasible to make a spark plug replacement with all this. Basically you'd have a metal (or ceramic) that doesn't accept much heat (Tungsten?) then have a hole going down to several small holes at the "tip". Back where the sparkplug cable connects is where you'd have the spark plug inside the tube inside a pocket. When air and fuel is compressed into the "hollow spark plug" and ignites on the pocket on the end the flame would shoot down the tube and out the small holes and jet around inside the combustion chamber.
The problem would be it would likely only work at high loads as low loads wouldn't be able to compress fuel and air far enough up the tube to reach the part where the spark is created. But that could be fixed by using a second spark plug.
Quote:
Originally Posted by Juho
... probably because egr effect is not present the same way.
...It may have been because of too much egr effect...
|
I wonder if you're going for a lean burn engine, why not hook the EGR circuit to the intake air filter? The excess air is basically inert like EGR in a lean burning engine anyway. You'd get the EGR effect performancewise while still having enough oxygen to burn up the fuel.