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Sunday, December 23, 2007

One Way to Attack the Knock Problem

No more worries about inexact ignition timing: now it's possible to programme the ignition to suit your own Fulvia.

This illustration comes from Mecaparts; it shows a reasonably-priced programmable ignition system that can be easily adapted to the Fulvia. Of course it is in French, but this is Fulvias in France! It is the system fitted to my Norman client's car about which I wrote here. My French is not nearly good enough to offer to translate the entire site, but I can probably help with specific queries if you care to email me.

If you visit the Mecaparts Site here, you will find a number of Acrobat files which give full information about the installation and programming of the system. It can be calibrated up to 11,900 rpm which should be enough for any Fulvia! On my client's car, the advance weights had been removed and the distributor locked (i.e. the rotor arm can no longer move relative to the distributor shaft) this is obviously necessary since all the advance is controlled by the electronics.

To me this seems to be an excellent solution for the Fulvia - especially as I doubt if many wish to go the route of complete engine management. Here is a system that could be installed by any competent amateur. Programming however requires a certain amount of knowledge and it would probably be best to set the the system up to an approximation of the original advance "curve" (some straight lines actually) and then take the car to the rolling road to establish the ideal parameters which could then be programmed into the system - or done on the spot with a laptop.

Should the car in question be further developed, the system could easily be re-calibrated to suit. And of course you would have the capacity to deal with any eccentric changes in fuel quality that may be implemented should the "Green" lobby decide to make things difficult for old cars.

Perfect really!

I have also found something interesting regarding the mixture side of things; more about this soon.

A bientôt

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