knock sensor/gauge

Forced Induction Mopar

  1. 70wayfarer

    70wayfarer FABO Gold Member FABO Gold Member

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    hi..
    anyone using these? are they worth using.
    i'm pushing 10 psi into my 360 via a vortech v2. have just had afr's sorted on the dyno where the dude thinks that a knock gauge might be worth the while installing.

    cheers
     
  2. 67Dart273

    67Dart273 Well-Known Member

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    They HAVE to be if they work correctly. Google around, there's guys hooking up sensors to headphones so that they can HEAR spark knock during tuning
     
  3. 70wayfarer

    70wayfarer FABO Gold Member FABO Gold Member

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    i was looking at a visual type so as to keep things in check while at the track or just cruising around
     
  4. HOTMOPR

    HOTMOPR Mr Horsepower

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    What is that car in your avatar? Looks like a dart camino.. looks cool!
     
  5. discharger1332

    discharger1332 Well-Known Member

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    valiant ute.
     
  6. 70wayfarer

    70wayfarer FABO Gold Member FABO Gold Member

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    yip...1970 Chrysler Wayfarer Utility.
     
  7. 72BBSwinger

    72BBSwinger Well-Known Member

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    Would be a great thing if it works and exists.
     
  8. HOTMOPR

    HOTMOPR Mr Horsepower

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    my dad has a knock sensor on his turbo 6. It only activates a small LED on the dash when it knocks.
     
  9. SSVDP

    SSVDP FABO Gold Member FABO Gold Member

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    I haven't looked at this in about 10 years.
    A knock sensor isn't a bad idea but its the implemtation that counts.
    Typically the sensor is tuned in to a certain noise frequency, the problem is if your engine has something that rattles (resonates) at the same frequency then you get a false read.
    So it all come down to how much you want to trust it with your engine.
     
  10. william

    william Well-Known Member

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  11. Map63Vette

    Map63Vette Well-Known Member

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    Yeah, there are different kinds of sensors. The most basic are essentially just microphones (piezoelectric elements for the engineers out there). They produce a voltage when they are vibrated, so you can more or less just attach them to headphones or a scope. The amount of voltage they produce is based on the severity of vibration, so they'll have lots of electrical "noise" all the time and then spike under conditions like knock (or hitting a hammer on the engine block as a way to test them). I believe Dodge uses the tuned variety mentioned above. I think they operate in a similar fashion (produce a voltage based on vibration strength), but I believe they filter out a lot of the "noise" and only really respond on larger signals. Typically I'm fairly sure they are engine specific though, so they are sensitive at whatever frequency the engineers determined the engine knocks at. This would mean you couldn't necessarily just go out and buy a sensor and expect it to work.

    The more simple "microphone" type are usually just a single wire hookup and I believe are farily common to GM. I know the sensors on my 5.7 Hemi are a two wire variety, but I still haven't figured out how to test them.
     
  12. MoparDreamin

    MoparDreamin Well-Known Member

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    The J and S unit is a fantastic knockbox. I have one in my rice burner. It works so well because I have a factory knock sensor. The problem with using it in a motor without a factory sensor is getting the right sensor in the right location to get clean signal. I just order knocksenseMS that has a filter which is frequency tuned for my 318's bore. I plan on just datalogging with it. We'll see if it works. My setup is a 318 magnum with vortech V2 @ 15psi.

    http://www.jandssafeguard.com/
    http://www.viatrack.ca/
     
  13. 70wayfarer

    70wayfarer FABO Gold Member FABO Gold Member

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    at the end of the day i dicided on a Innovate Motorsport digital AFR guage. cheers
     
  14. MoparDreamin

    MoparDreamin Well-Known Member

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    That doesn't monitor knock though....
     
  15. 70wayfarer

    70wayfarer FABO Gold Member FABO Gold Member

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    afr's were sorted on dyno and the way i see it if they are all good then the chance of knock/detonation is lessoned. the Innovate Motorsport MTX-L guage i fitted is digital with a digital needle around perimiter of gauge. easy to see and accurate.
     
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