[drmiller100]

Originally Posted by t vago

Thanks, but I'll take this book, The Internal-combustion Engine in Theory and Practice: Combustion, fuels, materials, design, at face value.

the book was written in 1968, with an update in 1985 by MIT in places.

I scanned through it - pretty good basics, but does not address lean burn, combustion chamber design, advanced fuel injection, etc.

And I could see no reference where the author stated 17:1 is max efficiency in all cases. In fact, the book seems devoted to describing all the different variables which change effiiciency, flame propagations, etc. and how they interrelate.

Could you point me to the page which says 17:1 is the max efficiency in all cases?

Regards
Doug