[svxistentialist]

Originally Posted by Dessertrunner

Its worth reading this artical about knock sensors.
http://www.autospeed.com/cms/article.html?&A=0348

Tony

Thanks Tony

That device on Part 2 is very similar in principle to what Trevor was advocating.

Reading Part 1, it appears to me that the discriminating circuits to decide what signals are actually detonation, these must be programmed into the ECU.

And then if this is the case, in adding a blower to the cylinder block matrix, we are actually adding an additional noise source into the equation. This additional noise will not have been accounted for or compensated for by the engineers designing the knock detection circuits and sensor placement. If nothing else, this must increase background noise and increase the signal amplitude and possibly change or adulterate the frequency of the signal as read by the discriminator circuit.

The worst case scenario is that some of the noise generated by the blower will be comparable in amplitude and frequency to the noise generated by detonation. In which case the circuitry will retard the ignition to safeguard the engine.

It's hard to see where we could go from here with PD blowers. The only simple solution I can imagine for the present would be to drill the bottom of the block and site the two sensors underneath and away from the side that the blower is bolted to.

Joe