I want to find papers of studies done on combustion in automobile engines. I know there was a lot of work doine on this, unfortunatelly I cannot find ANYTHING. If I type "combustion in engines" in the search field of any journal/search engine, I get completely unrelated junk. I'm looking for experiments for things such as piston shape, head shape, combustion timing etc. People have tried to maximize the work done on the piston from the combustion reaction the entire time, and I want to know more about it (what was tried, what works, what doesn't, etc). I was thinking of studying this type of thing myself for graduate studies, but I need to know what has been done first, so I don't try to repeat experiments that were already done. Thanks in advance.