Ignition theory

[Bruce Plecan]

-----Original Message-----
From: Chris Morriss <crsm at oroboros.demon.co.uk>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, December 20, 1998 3:12 PM
Subject: Re: Ignition theory

Some drag cars run a high gear retard, 2-6 degrees, I've heard.
Bruce


>In message <003901be2b84$966918a0$602005cf at tegu.talarian.com>, James
>Montebello <jamesm at talarian.com> writes
>>
>>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 
>
>I've often wondered why advance is given in degrees instead of in time
>units (milliseconds).  It's a lot easier to set the correct advance if
>the advance look-up table is in milliseconds of advance rather than in
>degrees.  The system I'm trying out a few design ideas on at the moment
>has the table in milliseconds.
>-- 
>Chris Morriss
>