This was posted on www.ubrf.org by Audi S4.

http://naca.larc.nasa.gov/reports/19...report-493.pdf

If you really want to know what it is and why its bad, it makes for some interesting reading. However, you may need to break out a Physics book before you get into it!

 

Damn there's not even an abstract.

Looks too technical for me right now, especially after having studied physics (E&M) for a few hours tonight.
-hype

 

this paper was published in 1935 from MIT, but where the word NASA come from?
I got a minor in physics but still can't read the math. but isn't the paper about the the sound wave effect so basically why we got the knock sensor nowaday (to allow higher compression) to prevent detonation?

 

If you look at the link, its hosted on NASA's website.

 

Excellent reading material!