Dick.T.,
First time Ive seen you on the list, and it looks like you have some
great info to share.
Tell us a little about yourself, your cars etc.
Great info, but I do have the following comments.
>Think about this following fact.......points are a switch ! A perfect
>switch closes with zero ohms resistence ! If your old used points have
>zero ohms when closed...what good is it to replace them?
You shall never find a switch with zero ohms resistance, but I
get the basic point here. I would like to add though that
points do wear too, and there is a transfer of
metal from one side of the points to the other, which is generally
clasified as pitting.
Pitted points are unrealiable, and should be replaced along
with the condensor, which propably caused the pitting.
>Ignition timing advance is determined by the distance from the spark
plug
>tip to the furthest part of the combustion chamber. The 82mm bore we
use
>has been determined to require a 36 deg (crankshaft deg.) spark advance
in
Not all engines, especially race prepped motors will require the same
final timing value.
The net compression at a given RPM, which is influenced by the
mechanical compression ratio and the camming, effect the velocity
of the flame front, along with the octane rate of the fuel used.
Higher octane causes slower burning, and allows for more advance.
>Mark your pulley at 36 deg BTDC then with vacuum OFF, rev engine to
2500
>engine rpm (this is full centrifugal advance speed) and turn the dist
to
>set the flash at 36 deg.
I>f the cent. weights are free and lubed, then idle rpm will give you at
10
>deg. BTDC at idle and this is just fine. The main thing being that
your
>engine will never see more than 36 deg BTDC at high rpm.
This assumes that the OEM distributor has 26 degrees of advance.
Most sumbeam distributors have 22 degrees of advance.
If you want to know for sure what you have, open up the distributor
and look at the advance weights. There will be a number stamped
on one of the weights. It will be 11 or 13. 11 means 11 cam degrees
which is 22 crank degrees.
Jarrid Gross
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