[Diy_efi] Ignition igniters

Adam Wade espresso_doppio at yahoo.com
Thu Feb 20 20:14:46 GMT 2003


--- Hugh Keir <hugh at sol.co.uk> wrote:

> I have been looking at some aftermarket ECU's that
> mention they sell igniters that work with the coil
> on plug set-up to presumably assist with the spark
> control / initiation.

> Can anybody help with a simple explanation of how
> they work and whether they will increase the timing
> accuracy of the spark delivery?

I doubt very much they will increase the timing
accuracy.  I would think that you will get more
reliable and consistent spark with such a setup over
one with a distributor.  Of course, you could also use
a waste-fire system with two coild and no distributor
(motorcycle style) in many cases.  The biggest
advantage over a setup like a motorcycle has will be a
reduction in weight, and no high-tension lines for RFI
and to build internal resistance over time.  Replacing
a distributor ignition allows for better saturation of
the core at high rpms (which should give a
higher-voltage spark when the primary field
collapses), and either individual cylinder or
waste-fire sparking.

Another thing you might consider if getting more
consistent ignition times between cylinders is
important to you would be Iridium plugs.  With their
much lower firing voltage, you can get the spark to
jump the gap even if the mixture at the plug tip is
fairly far from ideal, thus preventing ignition delay
with less-than-ideal fuel quality or atomization.

=====
| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
|   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
| "It was like an emergency ward after a great catastrophe; it  |
|   didn't matter what race or class the victims belonged to.   |
|  They were all given the same miracle drug, which was coffee. |
|   The catastrophe in this case, of course, was that the sun   |
|     had come up again."                    -Kurt Vonnegut     |

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