Variable advance for ignition

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From:	Daniel Yap [SMTP:flor1 at mailcity.com]
Subject:	Variable advance for ignition

How about some clues about what your working on, and what you intend to =
do.  For all the work you've mentioned might be cost effective to get =
one of the MSD timing boxes.
Grumpy

hi, anyone got any success on increasing the advance for ignition =
electronically? Theres no vacuum or static advance on the engine, =
everything is triggered electronically by a variable reluctance sensor. =
I know that one way is to mount the sensor on a slider and shift it but =
the engine belongs to the school and they discourage hacking away at the =
engine. I looked around and think that a all pass opamp or phase shift =
opamp might solve the problem. The diy_efi archives did mention =
something, Tommy Palm did do something like this but his details were a =
bit sketchy.
I was thinking of delaying the signal 350 degrees which would make it 10 =
degrees advanced. The main problem is that the phase shift opamp would =
delay from 0 to 180 over a frequency range. I tot of having two together =
but it would give a variation of delay as the engine goes from 500rpm to =
5000rpm. Any way of having a static advance introduced electronically?
Thanks and Merry Xmas
Daniel Yap


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http://shop.lycos.com/
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