Knock sensors - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-30-2004, 07:55 PM   #11
Senior Member
True Car Nut
 
Join Date: Dec 2002
Location: Sauk Centre, MN
Posts: 5,458
Thanks: 0
Thanked 0 Times in 0 Posts
OLBlueEyesBonne is on a distinguished road
Default

Quote:
Originally Posted by GAMEOVER (joe)
http://www.stcloudchampionauto.com/pdf/53_KnockSn.pdf


this should help you out
Hey Joe, you know that place that that website is for is only like 30 miles from me?
It'* also the place where I bought my Taylor Spiro Pro'* for my 1994 SLE from.
OLBlueEyesBonne is offline   Reply With Quote
Old 03-30-2004, 08:07 PM   #12
Senior Member
Certified Car Nut
Thread Starter
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

I emailed my professor. This was his response:

Quote:
>I've got a question about knock sensors. You mentioned they are very
>expensive and are only on high end engines. I have a 92 Pontiac Bonneville
>with a supercharged V6 that indeed has a knock sensor that is only about $50
>to get from a dealership. Later versions of the engine got two knock sensors.
> It is my understanding that most engines have knock sensors in them today.
>Am I wrong?
>
>John Wikoff

Dear John,

Thank you for the information. I did not make it clear that I was talking about fast response knock sensors (e.g., pressure sensors and gasket sensors). The cheap knock sensors that you mentioned are usually mounted on the engine block to detect sound or frequency. They are not fast enough to do truly real-time control; to control in one-cycle time. From my discussion with auto industry, they are looking for fast response knock sensors (quite expensive currently) to really push the engine to the limit (i.e. further increase the compression ratio).

Chia-fon Lee
J Wikoff is offline   Reply With Quote
Old 03-30-2004, 08:14 PM   #13
Senior Member
True Car Nut
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default

Quote:
Originally Posted by OLBlueEyesBonne
Quote:
Originally Posted by GAMEOVER (joe)
http://www.stcloudchampionauto.com/pdf/53_KnockSn.pdf


this should help you out
Hey Joe, you know that place that that website is for is only like 30 miles from me?
It'* also the place where I bought my Taylor Spiro Pro'* for my 1994 SLE from.
i never realized that
GAMEOVER is offline   Reply With Quote
Old 04-01-2004, 05:26 PM   #14
Senior Member
Certified Car Nut
Thread Starter
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

He told us in class yesterday that the mass produced knock sensors are a condenser microphone. Inside the knock sensor is a piezoelectric element. The element in the sensor is tuned to the engine knock frequency.
J Wikoff is offline   Reply With Quote
Old 04-01-2004, 05:51 PM   #15
Senior Member
True Car Nut
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default

good write up its nice to know what its made up of
GAMEOVER is offline   Reply With Quote
Old 04-01-2004, 07:52 PM   #16
Senior Member
True Car Nut
 
Join Date: Jun 2003
Location: Purgatory
Posts: 6,313
Thanks: 0
Thanked 0 Times in 0 Posts
PontiacDad is on a distinguished road
Default

THanks for the clarity. The microphone would explain false knock retrad from loose engine components, ie dip stick.
PontiacDad is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Knock sensors bo58gardner 1992-1999 3 09-16-2010 07:26 PM
Knock sensors plug test. Danthurs Trouble shooting + Test Procedures 0 10-15-2009 02:40 PM
Question about knock sensors sandrock Performance, Brainstorming & Tuning 5 09-30-2006 01:56 PM
knock knock knock L27Buick 1992-1999 7 09-17-2004 04:23 PM
Knock Knock, engine knock? Spiral 1992-1999 5 05-23-2004 10:08 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:46 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.