I'm still having trouble getting my newly rebuilt BN2 to run smooth.
I've changed out the plugs and coil and gone through the distributor several
times. We've even put the distributor on a machine to check out its operation
and it worked fine. I installed new bumble bee wires.
The carbs have been rebuilt with new needles and jets and all the seals. The
bowls have been adjusted. I tried Grosse jets and then reverted back to the
standard needle type valves. The fuel pump is a new solid state SU.
The only thing that has made some improvement was when I tried the old Delco
coil that came with the project. This coil is over thirty years old. With this
old Delco coil the engine idles OK but runs rough at higher RPM. It can even
backfire when opening the throttle quickly.
The two new standard type coils as well as one new Lucas Sport Coil cause the
engine to run rough at both low idle rpms as well as during revving. If I
observe the timing mark when flashing with the timing light. I can see the
mark advance with higher RPMs but as it moves above approx. 15-20 degrees
advanced, it starts to jump around mostly with no advance but even going to
the retard side.
Is there any kind of condition that would make the Delco coil run better than
the new coils. I'm thinking that the Delco can't be better than newly
purchased coils and it must be masking some other problem.
Any ideas are welcome.
Sincerely
Rick Neves
'56 BN-2
http://www.RickNeves.com
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