[Diy_efi] Ion Sensing project-Strain Gauges & Basic goal?

[bill.shurvinton at nokia.com]

Sorta. There is a delphi paper on this that Perry posted a link to =
(which I have since lost). Correlation is pretty good with flywheel. BUT =
the RMS errors are quite high, which make it less than ideal (4.5=B0). =
Fine for a grocery getter, but I would not trust a highly tuned engine =
on this without careful consideration of a back up for knock detection.

Bill

-----Original Message-----
From: ext Tom Sharpe [mailto:twsharpe at mtco.com]
Sent: 10 July 2002 04:29
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Ion Sensing project-Strain Gauges & Basic goal?


Can we measure crank acceleration between flywheel teeth and determine
peak pressure?????  TomS

Peter Gargano wrote:

> Jeremy Gonyou wrote:
> >
> > An engineer likened it to pedaling a bike.  You apply
> > the force when you get the most leverage.  In this
> > case you want the crank and the cylinder bore to be at
> > a 90 deg angle.
>
> WRT PPP and ION sense, you want to position PPP to maximise
> the area under your pressure * lever moment over the power
> stroke. But this requirement is ameliorated by such real
> world factors as knock, load, AFR, etc..
>
> The PPP will depend on engine design and load
>
> Peter.
>
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