Individual Cylinder AF Adjust

[bcroe at juno.com]

OK, So what's next?  Calibrate a scope to read A/F?  Set up 
a sampling system to read 8 cylinders based on 8 time 
delays you set?  Or is it 8 cam positions?  Is the delay constant
relative to throttle, rpm, cam postition, and/or time?  How do
we get to actual numbers?  Bruce Roe

On Tue, 05 Feb 2002 22:03:04 +0100 Lasse Langwadt Christensen
<langwadt at ieee.org> writes:
> 
> 
> socrace at ameritech.net wrote:
> > 
> > At 09:29 PM 1/29/2002 +0100, Jorgen_Karlsson wrote:
> >  >Cylinder selective measurement is hard to implement 
> > > because of other reasons, you will have to know the 
> > > time it takes for the exhaust gas to reach the sensor 
> > > and that is not a trivial task to find out.
> > 
> >     There's a couple of work-arounds for the "gas transport time" 
> > problem you mentioned.
> >     One way is to mount 2 sensors in split manifolds (one in each
> > manifold). This works well with sbc stock manifolds, for example. 
> > The passenger side manifold 8,4 pair fire 90 deg apart 
> > versus the 6,2 pair which are 270 deg apart, the other 
> > wo pairs are both 180 deg apart. So, the 2 pulses the 
> > sensor sees that are closest together are cylinders 8 for
> > the leading and 4 for the trailing. The pairs surrounding this 
> > one, 2,8 and 4,6 are both 180 deg, or twice the pulse width 
> > of the 8,4 pair, making it fairly easy to spot. With the right 
> > algo, you can watch this using a narrow band sensor.
> >    Actually using this to control individual cylinders is still no 
> > picnic, of course!
> > Bob D

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