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 Quoll
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 posted on July 4th, 2009 at 06:20 PM |
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Knock Sensor
Does anyone know a good place to put a knock sensor on a type 1 engine, as I am planning on using jaycars electronic ignition thing with the knock
sensor module?
cheers |
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Camo
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| posted on January 26th, 2014 at 02:28 PM |
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It's been 4.5 years since the above question, anyone come up with any good suggestions yet.
Not sure if it should be on the case, barrels or heads 
Cheers, Kev
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bugzla
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| posted on January 26th, 2014 at 05:12 PM |
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that is interesting would love to know also
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vlad01
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| posted on January 26th, 2014 at 06:25 PM |
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Best would be on the block nearest to the cylinder. heads probably pose too much valvetrain noise as could false trigger knock counts.
I am not sure on what type of sensor you will need as some are tuned to work in certain frequencies. I think the flat response type suits all engines?
If you are using an ECU to listen to the knock sensors and do the knock retard function you will need to have a knock filter board to suit the
resonant frequency of the bore diameter.
We have some programmable knock boards here. Can be used as a stand alone unit I think with the LED output but its mainly designed to work with Delco
ECUs. Should be able to be used with other ECUs too?
http://pcmhacking.net/forums/viewtopic.php?f=11&t=1820
product info here.
http://pcmhacking.net/forums/viewtopic.php?f=14&t=2993
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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Camo
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| posted on January 26th, 2014 at 08:58 PM |
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Hi vlad01,
thanks for the links. I am not a member of that site and was wondering if you have 'festy' details as he doesn't live that far from me and I would
love to have a chat with him.
I have a Megasquirt 3x system that I will be running and has inputs for knock sensors. But I have also been looking at this (click here - Knocklink G4) and was thinking I could use this
setup for tuning purposes and then as a visual backup if I got bad fuel etc - example only.
Or if 'festy' wants, I can send you my details and he can ring me. Thanks again for your help.
Kev
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psimitar
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| posted on January 26th, 2014 at 09:19 PM |
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On the Subaru EJ engines the sensor is located on the block on the rear right cylinder. Closer to the crank centre than the head from memory.
madness is in the eye of the beholder  |
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vlad01
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| posted on January 29th, 2014 at 07:45 AM |
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ideally it should be mounted in the cylinder water jacket as water transmits sound awesomely.
Unfortunately the AC engine doesn't have that luxury of water and the cylinders would be too hot for the sensors to last imo. The case nearest to the
cylinders would be best.
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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1303Steve
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| posted on January 29th, 2014 at 03:31 PM |
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hi
I think it would be hard for a sensor detect a knock over other noise on an air cooled engine.
Steve
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vlad01
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| posted on January 29th, 2014 at 06:48 PM |
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nah, should be fine. Knock is a narrow band frequency. the knock filter is a band pass filter only letting in and processing the frequency of the
knock then outputting as a digital signal.
That frequency being the the resonance of the bore diameter. So even if you have tones of noise the knock is detected as the rest of the noise it
generally filtered out. That said though, the SNR is improved the less other noise there is, reducing the chance of false trigger.
That knock board I linked to is fully configurable via PC gui and can be adjusted as the engine is running to get the best knock detection.
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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