10. to 1 Knock sensor??? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-13-2002, 11:54 AM
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Post 10. to 1 Knock sensor???

89 chevy p.u. 350. Replaceing stock 350 with a 350 thats got about 10 to 1 comp. Keeping truck with the TBI and stock computer and all. The stock setup has a knock sensor to it. Question; Will the knock sensor work like it did on the stock setup? Also, what about a performance chip? Someone said a chip wasn't nessary on my engine. 350 305 heads, med. cam, TBI w/swirl riser, headers. I ran this engine in another car and ran great. High compression, pump gas and all. Just thinking about the knock sensor, if it'll help any.

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Old 11-13-2002, 01:02 PM
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The knock sensor circuit will still be active unless you eliminate it via custom chip.

If the replacement engine has a cam much more radical that the one in the engine you are replacing, it may require a custom chip as your system is speed density and only recognizes pre-set values. If there are any bad idle characteristics, you need to talk to a chip burner.

The use of a chip usually changes fuel delivery and timing events, but in the case of speed density, it also allows certain engine modifications.
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Old 11-13-2002, 01:50 PM
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Kultulz, thanks for the input. I'll talk with a chip burner and see what we can come up with. The knock sensor was just a thought. I can do without it but if there was an advantage to it I'd use it.Thanks for again
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Old 11-13-2002, 02:54 PM
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I would retain the knock sensor as if you get a bad load of fuel or there is a malfuction in the timing curve it will retard the ignition advance to prevent pre-ignition.
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Old 11-13-2002, 03:27 PM
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KULTULZ, any recommends on chip burners?
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Old 11-14-2002, 12:47 AM
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Well, -here- is my personal choice, but there are many companies. Check out as many as you can to get exactly what you want and price.
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Old 11-14-2002, 12:01 PM
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The current issue of Chevy High Performanc has a technical Q &A on this point. I won't attempt to answer because I can't remember what the conclusion was.
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