I have been reading up on ignition systems. From what I have read, the
original dizzies, due to wearing as much as anything, often are a cause
for lost performance.
I have a '70B fully de-smogged running a '77 18V low compression engine
with and AL head.
I have three 25D dizzies (2 came with a parts car.) If I hold the
rotor and wiggle the shaft, 2 of them have a bit of play in them. This
doesn't seem like a good thing, but I am not certain. The third is in
my car (STILL AT THE BODY SHOP. MOAN) so I don't know if it wiggles or
not. The vacuum advance does still advance on the one installed, but I
don't know if the curve is correct for certain, no reason to doubt it
however.
I read a bit on replacement and the 45D is being used for the 25D's now
from what I could tell.
How does the 45D compare to the other options?
The Mallory dual point looks interesting, and I have seen others use
it.
I have been running both a weber carb and SUs, and have always used the
vacuum advance as that is required. The Mallory comes with vacuum or
mechanical. What is preferred? Does it even matter? I would guess
you would just plug the vacuum line to use the mechanical one over the
vacuum.
Would I be better off rebuilding a 25D or looking at one of the others?
Thanks!
--
Andrew Lundgren
lundgren@byu.net
http://www.itwest.net/~lundgren
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