On 17 May 1998, David Hill wrote:
> Set the top gap to a tight 2 thou.
This will give a very lean mixture. Which would explain your
misfire problems at idle.
Note also that the PI system should be set up based on inlet vacuum. You
cannot get a proper calibration just by setting the end points.
Furthermore, you'll normally shouldn't disturb the datum track -
adjusting the springs in the vacuum chamber will give better control.
The adjustment is not a very difficult task, and an inexpensive vacuum
meter (avoid the very, very cheap ones, I'd say) as used for measuring
inlet vacuum will usually do. I checked mine against a calibrated, digital
pressure gauge, and was surprised how closely it tracked. YMMV.
You'll find the complete table at:
http://www.kvaleberg.com/t_pi.html
> the lower gap
> remains at about 60 thou.
This will set the fuel supply at WOT. The gap should be 1.44mm (57 thou).
Your setting is not far off the mark, and would definitely not effect the
idle at all.
> Also, would it be feasible to detach the mixture unit from the pedestal,
> where the drive dog fits.
Yes. Just don't loose the drive dog, and don't rotate either assembly.
> Finally, are PIs known for killing plugs?
No.
> The Bosch set fitted show a very
> poor spark
A lean mixture would over time kill plugs, as well as your entire engine.
Egil
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