[Diy_efi] Peak cylinder pressure timing

[Brian Michalk]

Thanks.  It helps a little, but I was really hoping to get a better handle
on the piezo crystal.

 Brian Michalk  <http://www.michalk.com>
Life is what you make of it ... never wish you had done something.
Aviator, experimental aircraft builder, motorcyclist, SCUBA diver
musician, home-brewer, entrepreneur and mostly single


> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Hugh Keir
> Sent: Wednesday, March 05, 2003 3:17 PM
> To: List for general do-it-yourself EFI talk
> Subject: Re: [Diy_efi] Peak cylinder pressure timing
>
>
> Brian,
>
> This should take you to a Daimler Benz 1983 patent
>
> http://l2.espacenet.com/espacenet/bnsviewer?CY=gb&LG=en&DB=EPD&PN=
> DE3130238I
> D=DE+++3130238A1+I+
>  or the above line is too long,
> http://l2.espacenet.com/espacenet/viewer?PN=DE3130238&CY=gb&LG=en&DB=EPD
>
> 1938 patent
> http://w3p.espacenet.com/espacenet/viewer?PN=DE656168&CY=gb&LG=en&DB=EPD
>
> Click drawing
>
> 1972 Patent
> http://w3p.espacenet.com/espacenet/bnsviewer?CY=gb&LG=en&DB=EPD&PN
> =CA908745&
> ID=CA++++908745A1+I+
>
> Click drawing and look at figure 3 bottom of the page
>
> All of the above links are long and may loose some of their
> length with the
> word wrap, so add the characters on the wrapped line back in.
>
> There are loads more like the above, although the first one is more like
> what I had in mind.
>
> Hugh
>
> ----- Original Message -----
> From: "Brian Michalk" <michalk at awpi.com>
> To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
> Sent: Tuesday, March 04, 2003 9:12 PM
> Subject: RE: [Diy_efi] Peak cylinder pressure timing
>
>
> > I am very interested.
> > What do you mean by the top of the housing?  Is the crystal inside the
> > combustion chamber?
> > Do you have any references?
> >
> > > -----Original Message-----
> > > From: diy_efi-bounces at diy-efi.org
> [mailto:diy_efi-bounces at diy-efi.org]On
> > > Behalf Of Hugh Keir
> > > Sent: Tuesday, March 04, 2003 2:27 PM
> > > To: List for general do-it-yourself EFI talk
> > > Subject: [Diy_efi] Peak cylinder pressure timing
> > >
> > >
> > > There are a number of patents, some going back over 20 years covering
> the
> > > use of piezo crystals that use the spark plug ceramic as a piston to
> > > compress the piezo crystal against the top of the spark plug
> housing and
> > > allow you to read the cylinder pressure.
> > >
> > > There do not appear to be any systems in the marketplace that
> > > take advantage
> > > of this system for peak cylinder pressure readout.
> > >
> > > Optrand and Kistler make some more advanced systems that are
> US$3000 per
> > > spark plug - hardly suitable for the hobbyist.
> > >
> > > Having spoken to a piezo manufacturer, it appears that there are
> crystals
> > > that will give a good response and should stand the heat found at
> > > the top of
> > > the spark plug housing. Does anyone have any thoughts on why
> this is not
> > > do-able for the timing of peak cylinder pressure.
> > >
> > > 8000 RPM = 48,000 degrees crank rotation per second which should
> > > be readable
> > > to something close to 1 degree with a decent processor clock
> speed and a
> > > simple bit of averaging, compare it to the crank trigger and
> display the
> > > figure.
> > >
> > > Stands back and waits to be shot down!
> > >
> > > Hugh
> > >
> > >
> > >
> > > _______________________________________________
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> > >
> >
> >
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>
>
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