Subject: RE: Generator replacement
Author: murp-@aol.com
Date: Mar 9, 2001, 10:51 PM
Post ID: 1705805115
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 |