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Old 04-03-2009, 11:23 PM
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Affordable knock sensor- carbed sbc

does anybody know enough about knock sensors to be able to tell me how to make some sort of gauge or flashing light to indicate engine knock on a carbed sbc? msd makes a cheap looking indicator, though the price is too much imo for what should be fairly simple to construct. this is going in my jet boat, so less is more.

ill be running 150 shot of nitrous on a 400+hp 350 with full msd ignition. some kind of way to incorporate it into the ignition retard circuit would be awesome

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Old 04-03-2009, 11:33 PM
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that "simple circiut could get fairly complicated. a knock sensor sends an ac signal to the pcm. it does this because there is a pizzo crystal inside that produces voltage at certain frequencies. you'll need a way to convert that signal to a dc voltage, in order to triger a transistor so you can activate a relay ect...
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Old 04-04-2009, 08:56 AM
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You can buy one from MSD.. I'v got one and it worked great.
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Old 04-04-2009, 02:16 PM
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Quote:
Originally Posted by racecar100
You can buy one from MSD.. I'v got one and it worked great.
he said they were out of price range. of course in the end it would be the best way to go.
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