Cam position sensing w/o a cam sensor

[Bruce]

To run batch fire, would indicate you have a distibutor already, just add a
sensor to that for cam posistion.   Might consider going DIS, and remove the
HV from the Distributor.

If you have acess to a in cylinder piezo electric pressure sensor, that
would work, but your getting into the *exotic* unless an oem one.  I'd b
interested in hearing if anyone has used a Toyota one in anything of custom
design.

If you go with the exhaust sensor, I'd use a WB for detecting a pulse.  At
lower speeds the can accurately respond to an individual pulse, thou I don't
know how myuc latency there is
Bruce




From: "Santi Udomkesmalee" <scathontiphat at hotmail.com>
Subject: Cam position sensing w/o a cam sensor
> I'm interested in running a sequential system, but I'm having a problem
with
> getting TDC of cyl. 1.  I know the traditional approach is to use a cam
> sensor, but this seems like an excessive amount of work, since the ECM
only
> needs to sync the flywheel sensor input to the cam sensor input once.  My
> thought is that the engine could run for a few seconds in batch fire until
> the ECM could figure out TDC of Cyl. 1, and then switch to sequential.  If
> anyone can figure out a way to do this cheaply w/o the use of a cam
position
> sensor, I'm open to any ideas.  I've thought about using an EGT in cyl. 1
> exhaust tube, but I'm not sure if the EGT has a high enough resolution for
> this to work.  Also, I've thought about using a peizo electric sensor for
> sensing cylinder pressure on the spark plug 1, but I'm also not sure if
that
> will work.  Suggestions?? thanks.
> -santi u.


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