Ignition theory

[Putter C]

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Hi

Another way to estimate the load would be to look at the vacuum in
the manifold, (like th eold distributers). If the load increas (throttle
open wider) the preasure would drop and thus the ignition is retarded,
ect.

One realy can be looking at the rate of change, could be interesting

Cheers
Carlo

Stellenbosch, RSA

> -----Original Message-----
> From:	James Montebello [SMTP:jamesm at talarian.com]
> Sent:	Saturday, December 19, 1998 9:20 PM
> To:	DIY_EFI list (E-mail)
> Subject:	Ignition theory
> 
> 
> I'm sure everyone on this list is familiar with the idea that
> ignition advance increases with engine speed.  However, a number
> of the newer ignition systems take load into account to alter
> the timing.  I would suppose that one retards as load increases 
> (wild guess there).  Any general relationships?  Most of the 
> systems I've seen use throttle angle to indirectly measure load.
> Is it likely they take a rate of change into account as well?
> If so, what would be the general behavior for a given rate of
> change?
> 
> Just trying to get a discussion going...
> 
> james montebello 

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