Re: Help! Ignition Timing 2.25 Petrol - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 1 (permalink) Old 01-16-06, 04:01 AM
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Re: Help! Ignition Timing 2.25 Petrol

"Alex" <> wrote in message
> Recently been having running trouble with a IIa 2.25.
> Checking the ignition timing, i have conflicting data from workshop
> manuals:
> II Manual Says:
> 7.0:1 engine
> 75 RON 3deg Before
> 80-85 RON 6deg Before
> IIA manual says:
> 7.0:1 or 8.0:1 engine
> 75 RON TDC
> 80-85 RON 3deg Before
> 90-95 RON 6deg Before
> III Manual says:
> 7.0:1 engine
> 75 RON TDC
> 80-85 RON 3deg Before
> 8.0:1 engine
> 80-85 RON 3deg AFTER
> 90 RON TDC
> Considering all these engines are the same, use supposedly the same
> distributor, and have the same valve timing, why the hell is there so
> much difference? Some of the figures i can accept as being "optimal"
> and varying slightly (vis 3deg or 6deg for 85RON) but how come the
> setting for a IIa with 90RON is 6degrees before, but for a III with
> 90RON it is TDC?
> To complicate matters further I have a 1965 IIa engine which has a
> Lucas 45D distributor fitted, from a 1975 vintage engine. Now what do
> i set it to?
> Cheers
> Alex

You could do it the old way get the engine nicely warm slack off the pinch
bolt and slowly adjust for best revs then tweak the throttle to make certain
she doesnt bog down if alls well nip up the pinch bolt and have a test run
if she pinks retard the ignition a couple of degrees and check again. I
admit its not a book accurate way to do the job but if you are running
non-standard equipment or there is wear in the dizzy you are likely to get
the best result that way .

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