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In a message dated 11/12/2011 12:47:25 A.M. Central Standard Time,
ericsturgis@xxxxxxxxx writes:
The "Rotor" is the thing that spins underneath the cap that send the spark from the coil, through the points to the cap, Sorry,,,I am not trying to nit-pic here, but with all of the young people
we have on the list, I think that for their own understanding of a distributor
that the above statement should be clarified
The "Rotor" is the thing that spins underneath the cap that
send the spark from the coil
that statement is true
the spark from the coil goes to the middle post on the distributor cap, to
the rotor, which turns and makes contact with the outer (spark plug wires) posts
on the cap
through the points to the cap,
this statement is wrong, or misleading at best,,,, the points actually are
what open and close making a complete circuit to power the coil, which in turn
causes the coil to send out a spark (to the rotor),,,,,, the actual spark does
not go through the points
Those of you who totally understand a distributor can disregard the rest of
this email, on the other hand if the workings of a distributor are in the
grey area of your tech, please read on and I will go a bit deeper .
A distributor is one of the final steps of
getting the spark to the sparkplug's at the correct time to cause the engine to
run correctly, it begins at the crank, which is connected to the cam by means of
a timing set, usually consisting of two gears and a timing chain, the
timing set keeps the crank and cam in time with each other, causing the valves
to open and close at the correct time with the position of the pistons. On
the cam is another gear drive, which turns an intermediate shaft, sometimes
called a distributor or oil pump drive, the distributor drops into the top of
the block, and is driven by this gear, the distributor housing turns freely
while sitting in the block, and this is where your timing is adjusted with use
of a timing light attached to the #1 plug wire and aiming the light at the
HB to see the timing marks. At this point the distributor starts doing
it's part which consists of several things, as it turns, it mechanically (points
type distributor) opens and closes a set of points which completes the
circuit to the coil and causes the coil to send out a high voltage charge from
the coil to the center terminal of the distributor cap which goes back
inside the cap and to the rotor which is turning with the engine, as the
rotor turns it completes the high voltage circuit between the
coil and the individual plug wires located around the outer part of the cap, and
delivering the HV charge at the correct time to the sparkplug,
causing the fuel in the cylinder to fire.
Any one of the above mentioned items being worn can cause an engine to
either not run correctly or not run at all.
To all the people that read through this long post, please feel free to add
and or correct my statements,,,,,Let the truth be known,,,
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