Back when I was a teenager, my parents had a series of 1970
Ford Torino station wagons with 351 V8 engines. It was easy
to produce some knocking by simply flooring it while going up
a hill on a hot day. But those cars were a lot smoother and quieter
than a Spit...
I have been thinking of building a small microcontroller-based
electronic ignition unit, with a knob that would let me adjust
the timing while driving. Then I could quickly find the "sweet spot"
for best power without knocking. Or maybe I could rig up a
temporary mechanical adjustment (something like a choke
cable), sort of like really old cars had.
Doug
At 03:53 PM 11/6/01 , Barry Schwartz wrote:
>
>*******************************
>ANY internal combustion engine burning gasoline given enough load and
>enough advance timing WILL knock - No if ands or buts. Knocking or pinging
>is the uncontrolled explosion(s) inside the cylinder, not the smooth flame
>propagation from the spark source downwards. Now if you don't know what
>it sounds like you might miss it. In fact it can be so slight that you
>don't even hear it, but none the less it can and does happen and is VERY
>damaging if it happens on a more or less constant basis If you happen to
>have other loud noises, then it may mask or drown out the pinging - as it's
>not *particularly* loud (unless very severe and even then a loud exhaust
>*could* mask it).
>*******************************
> >I wish I knew what Spit knocking sounded like. Is it
> >extra-loud, like all the other engine noises I hear?
> >Or do all the other noises tend to mask it?
>*******************************
>The best description I can give you is it sounds like a bunch of marbles in
>a blender -
>
>Barry Schwartz (San Diego) bschwart@pacbell.net
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