Thread: knock sensor
View Single Post
kenikh kenikh is offline
3 restos WIP = psycho
kenikh's Avatar
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,729
Originally Posted by hobieboy View Post
I understand that knock sensing system needs to be tuned to recognize knocks?

So a question for those who installed a system - is my understanding correct? If so, how did you tune it the 1st time? Make the engine knock?
You can apparently ballpark the frequency by piston diameter, but the actual variables are numerous and require advanced math to resolve. Here's a start:

Resonant knock frequency (kHz)= 900/(pi x cylinder radius)

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 08-08-2009, 07:57 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #61 (permalink)