Topica Loopframe_Guzzi Archive
 

Subject: Re: Generator replacement

Author: Charles Mullendore

Date: Mar 10, 2001, 11:16 AM

Post ID: 1705810199

Hi Brian and all,
Part of the Loopframe charm for me is the single point distributor with it's
automotive style cap and rotor. Why not change the drive gear and keep it?
Then you'll only need a single, super reliable Bosch blue coil. No mounting
problems! But then I don't like electronic ignitions. With the stock
distributor who will guess from outward appearances that inside is a hot-rod?
Kinda' like sleepers myself. :-)
Cheers!

Charlie

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Hunter,
Thanks again for your comments, from which I now THINK i know what is
going on with this ignition system. I just did not understand why the
pitch of the worm gear was changed so radically if the distributor speed
was the same (between Eldo and T-3). My only question now is to ask
whether there will be sufficient room to fit 2 coils under the tank.
With my Eldo project I am trying to build a bike with modern
performance with the good old loopframe charm. I had an Eldo back in the
'70's which I loved, although I thought the braking was poor. So, when I
was looking for an Eldo to restore, I looked for a disk brake model,
which I found last year. Aside from the 1000 cc kit and the B-10 cam, I
have had the block machined to take an internal oil filter, and will use
a T-3 pan in place of the old pan. I have also gotten an 850-T rear
wheel with a cush drive, which should be easier on the splines and
transmission. Right now I am waiting for the engine to come back from
the shop and for the painter to finish with the body parts. I will let
you know how it all turns out, but until then I'm sure I will have more
questions from time to time.

Brian
'74 Eldo
'78 T-3

Hunter Jones wrote:
 Hi Brian,

They run the same speed. The difference you see in the gears is because
both the drive gear on the cam and the driven gear on the dist are
unique
to the particular engine. The angle (pitch) at which the teeth are cut
matters only in that both gears (the drive and the driven) are cut to
work
together. If you count the teeth you will see that the cam and dist have
the same number (a 1 to 1 ratio) of teeth. BUT the two different series
of
engines use different gears.The Eldo set will have a certain number of
teeth and the later set may have more or less. It does not matter how
many
teeth there are (12 or 12 dozen), only that the same number of teeth are
on
both gears in the set. They must be used with the proper mate, ie: you
can't plop a dual point dist onto an Eldo. If you could I would have
done
it long ago. But the idea of using the original Eldo gear on a dual
point
dist for a stock Eldo engine might be fun to try.
Take the dist cap off of the bike and watch as you turn the engine.
Turn
the engine twice and the dist will make one revolution. The single
points
will open twice. The dual points will open once each. Same end result
except that the single point setup needs the cap and rotor of the dist
to
direct the spark to the correct cylinder while the dual points simply
fire
a coil that is dedicated to 1 cylinder. This is better from the
standpoint
that each coil has longer to saturate between firings and (this is also
a
curse) each cylinder can be timed independently.
I must say I am fascinated by you hop up on a loopframe and I certainly
hope you will keep us all up to date on how it is going.
I will gladly help any way I can. :-)

Hunter

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