thehelix112 Posted March 19, 2006 Share Posted March 19, 2006 Making Detonation Detectors for an Engine Tutorial Parts Required; 3-4m of 1/2" rubber hose Set of cheap plastic ear muffs 1/2" copper pipe Tools Required; Hammer 8-9mm drill bit 13-14mm drill bit Step 1: Cut the copper pipe into one or two 10-15cm lengths, depending on if you want to listen to two points on the engine. Step 2: Hammer 3-4cm of one end of each copper pipe flat. Step 3: Drill a 8-9mm hole in the flatted section of this pipe. Step 4: Bolt the copper pipe(s) to the engine. The ideal place for this is on the block, as high up the bore as possible (as close to where detonation occurs as possible). Step 5: Cut the rubber hose into lengths and find a way to feed them from the engine bay into the cabin. As my heater doesn't work anyway I just removed the heater hoses and used these two holes in the firewall. Step 6: Slide one end of the rubber hose onto each copper pipe you have bolted to the engine. Here is an example: Step 7: Drill a 13-14mm hole in each side of the cheap plastic earmuffs Step 8: Squeeze each rubber hose into these holes. Here is an example: Step 9: Put them on and look like a doofus while driving. I believe mad1600 has an example somewhere of me doing just that. Thanks to HSVSUX (he told me of this idea), and Umm_510 for hosting the pics. Dave Quote Link to comment Share on other sites More sharing options...
sims76 Posted March 20, 2006 Share Posted March 20, 2006 Awesome DIY post.... Can you please describe the sounds that you hear. Or, will "you know it when you hear it?" Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted March 20, 2006 Share Posted March 20, 2006 haha thats bad *** Quote Link to comment Share on other sites More sharing options...
big-phil Posted March 20, 2006 Share Posted March 20, 2006 wow I have all that stuff laying around Quote Link to comment Share on other sites More sharing options...
Bernardd Posted March 20, 2006 Share Posted March 20, 2006 hey, great minds thing alike, i made the very same setup last fall.....works very well. Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted March 21, 2006 Author Share Posted March 21, 2006 sim76, You'll definitely know it when you hear it. You can hear each individual valve opening and closing which makes one particular sound, the sound of detonation is more high pitch and definite irregular (which is why elec det sensors have so much trouble figuring it out). Dave Quote Link to comment Share on other sites More sharing options...
datman Posted February 3, 2007 Share Posted February 3, 2007 would you guys be interested in a simple device tht you could wire to a used knock sensor taken from another car. It could give an audible or visual warning. Let me know and I'll knock something up...excuse the pun:) Quote Link to comment Share on other sites More sharing options...
big-phil Posted February 3, 2007 Share Posted February 3, 2007 would you guys be interested in a simple device tht you could wire to a used knock sensor taken from another car. It could give an audible or visual warning. Let me know and I'll knock something up...excuse the pun:) YES!!!! maby an L.E.D. light right between the the tach, and speedo. Let me know. I'll take one. Quote Link to comment Share on other sites More sharing options...
Guest Mike Posted February 3, 2007 Share Posted February 3, 2007 would you guys be interested in a simple device tht you could wire to a used knock sensor taken from another car. It could give an audible or visual warning. Let me know and I'll knock something up...excuse the pun:) Interesting... could you post some test results? I might be interested too. EDIT: Became interested and did a quick search. I found one but it's overpriced, IMO. I'll look for a cheaper one. In the interim here's the one I found... http://tunertools.com/proddetail.asp?prod=TXS-KNOCK EDIT#2: Making a visual warning light for engine knock may not be as easy as it would seem. After some research, I've learned that knocks change frequency depending on diameter/size/shape of the combustion chamber and the audio frequency can vary from 2-12 KHz. I guess the most accurate way is by listening as was originally posted in this thread. However, if one knows the appropriate frequency range for a given motor, building a visual indicator should be fairly straightforward, I would think. Quote Link to comment Share on other sites More sharing options...
Guest Mike Posted February 3, 2007 Share Posted February 3, 2007 Here's a "knock sensor" with a light, heh, heh... http://www.hearmore.com/store/prodview.asp?idstore=1&idproduct=455&showall=yes Quote Link to comment Share on other sites More sharing options...
datman Posted February 3, 2007 Share Posted February 3, 2007 It would be tricky to detect knock on all types of engines but not that hard for one type eg L6 Ill work on something and give you the schematics Quote Link to comment Share on other sites More sharing options...
datman Posted February 3, 2007 Share Posted February 3, 2007 Not my design but this would work for an electronic listening/recording....you could record onto windows sound recorder details here http://home.netcom.com/~bsundahl/knock/listen/listen.htm#Recorder Quote Link to comment Share on other sites More sharing options...
datman Posted February 3, 2007 Share Posted February 3, 2007 It seems that some cars have a filter system beofre the ecu, some Buicks and Saabs, this could be used to give a 0v-5v into the megasquirt Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted February 3, 2007 Author Share Posted February 3, 2007 K.I.S.S Dave Quote Link to comment Share on other sites More sharing options...
datman Posted February 3, 2007 Share Posted February 3, 2007 I.i.s.s Quote Link to comment Share on other sites More sharing options...
Sparks280zt Posted February 4, 2007 Share Posted February 4, 2007 I.i.s.s Nice comeback, lol. Quote Link to comment Share on other sites More sharing options...
Lunar240z Posted February 4, 2007 Share Posted February 4, 2007 http://www.viatrack.ca/ This can be used with MS or without. Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted February 4, 2007 Share Posted February 4, 2007 KnockSense can utilize the stock ZXT knock sensor - which is tuned for the L28 already.... Quote Link to comment Share on other sites More sharing options...
Guest Mike Posted February 4, 2007 Share Posted February 4, 2007 It would be tricky to detect knock on all types of engines but not that hard for one type eg L6Ill work on something and give you the schematics Agreed... However, I currently have a 350 SBC w 10.5:1 and Edlebrock Performer RPM heads. Soon this will change to a SBC 434 with 11.5:1 pistons and AFR heads and will probably change headers too. I don't know if there's enough difference between to two motors to change the knock frequency much. Although I've read differently, it may be that knocks are nearly the same frequency in most engines. When I feel the urge to do some more research I'll look into it further. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.