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7 Aug 2012, 07:46 (Ref:3116963) | #1 | |
Racer
Join Date: Mar 2003
Posts: 445
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Knock sensors
Does anyone know if it is possible to but a dash mounted knock sensor warning device ? I am sure there was one on the market a few years back but don`t seem to be able to find one now.
As I remember it was a very simple device with an illuminating warning light when it detected any knock. alex |
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7 Aug 2012, 09:35 (Ref:3117011) | #2 | ||
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7 Aug 2012, 19:40 (Ref:3117247) | #3 | |
Racer
Join Date: Mar 2003
Posts: 445
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Knock sensor
Thanks Chris,
I assume this is completeley independant of you engine management system ? Alex. |
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8 Aug 2012, 08:52 (Ref:3117476) | #4 | ||
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8 Aug 2012, 09:05 (Ref:3117481) | #5 | ||
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8 Aug 2012, 19:53 (Ref:3117709) | #6 | |
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8 Aug 2012, 21:28 (Ref:3117736) | #7 | ||
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Race exhaust, intake roar while wearing helmet and balaclava not always possible to hear, MSD also do devices a mate of mine fitted one in his Camaro a few years back.
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9 Aug 2012, 06:11 (Ref:3117813) | #8 | ||
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Yeah that^
On my last car if you hear it knock it was already too late- ring land would be cracked, damn turbo's it all happens faster. Now not a problem, you can hear it coming on and back it off. I guess the alloy block helps the resonance |
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12 Aug 2012, 22:21 (Ref:3119104) | #9 | ||
Racer
Join Date: Dec 2003
Posts: 107
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The trouble with knock sensing is knowing the characteristics of what you are looking for. Knock is usually in a narrow frequency band at a particular load site in the engine map. Unless the sensor is capable of sensing across a wide frequency band and the controller is able to pick it out, I wouldn't bother with it. When Bosch conduct knock testing on race engines, they fully instrument the entire engine to characterize knock. It costs thousands to do it properly and I would be suspicious of cheap alternatives claiming to be able to identify knock unless its really obvious.
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