I've seen a few articles floating around about how to make a knock sensor with a microphone, amplifier, and some headphones.. but never heard of the success with this.. or an exact how-to.. anyone ever try this?

 

Hah, doesnt sound too accurate.

 

from the articles i've read you can actually hear the knock before any electronics can detect it.. but i don't know how true that is.

 

http://www.autospeed.com/cms/A_0353/article.html

this is the one i never got around to building...hlhs

 

I have got the impression that the human ear/brain is really the best signal processer to date. this site is kinda interesting;http://pw1.netcom.com/~bsundah...s.htm

I have a tool called the chassis ear that has a bunch of clip on mics a switch-amplifier box and a some headphones. never tried it for knock, but I'm sure it could be an advantage to have multiple inputs to toggle through.

 

Have your buddy hold a nice craftsman screw driver on the valve cover as you do a pull on the dyno.

Never fails to get rid of a freind!

Oh wait...

 

My favorite diagnostic tool: Mechanic's stethoscope.

 

Is there a place to buy a prebuilt one?