Cam position sensing w/o a cam sensor

[Santi Udomkesmalee]

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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