[Diy_efi] Knock Detection by J+S

[Bruce]

Some engines can generate a freq., similiar to knock, which can fool an
acoustic K/S.
By developing two windows of when to listen for the knock you can develope
one as background noise and then analyse the difference to see if it's
actual knock or not.
By retarding one or all 8 cylinders at a time, and then adding the timing
back in one by one you can figure out which one is the problem.   I don't
know if this is how J+S, or Accel do it.
Bruce


----- Original Message -----
From: <bcroe at juno.com>
To: <Diy_efi at diy-efi.org>
Sent: Wednesday, May 29, 2002 11:58 PM
Subject: [Diy_efi] Knock Detection by J+S


> Bruce,
>
> I know the J+S retards individual cylinders to maintain as much
> power as possible.  Since there is no cam sync, it can't tell you
> which cylinder that is, but it will give the max amount of retard.
>
> Just what else is done to "look for knock when its likely"?  I was
> thinking of paying for an Accel 7 knock detection option, but I
> am leaning toward using my J+S system instead.
>
> thanks, Bruce Roe
>
> On Wed, 29 May 1996 09:46:46 -0400 "Bruce" <nacelp at bright.net> writes:
> >
> >
> > Learning how to read plugs is the only true answer.
> > J+S makes some serious K/S stuff.   It just looks for
> > knock when it's likely to be present not full time.  Too
> > easy to sense noises that appear to be detonation
> > in a race engine.   An Acoustic detector is looking for
> > noises, ONLY.   If any NOISE is similiar to what it's
> > looking for it will be triggered.
> > Bruce
>
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