How do dual point distributors work?
With the dual points distributor, the first points set to close “makes” the circuit and will incur any ravages caused by a small amount of arcing when closing. The last points set to open “breaks” the circuit and will incur any ravages caused by a small amount of arcing when opening.
Which is the trailing set of points in a dual point distributor?
If you look into the distributor from the top, you will notice that the pair of points are nested to one side of the distributor housing. No matter the rotation of your distributor, the first point set that opens is called the primary set. The second one that opens is called the secondary (or trailing) point set.
How do you set a dwell on a distributor?
To set the dwell, remove the distributor cap and rotor, ground the coil wire and remove all the spark plugs from the engine. Set up your dwell meter and hook up a remote starter. If you don’t have a remote starting loop, you can always ask a friend to be your key operator for this procedure.
What is the primary purpose of the dual point system?
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Can you set the gap on a dual point distributor?
For Dual Point distributors there is a bit more effort involved. You can still set the point gap on the “primary” point set in the distributor (see note below), but you might as well forget the secondary point set at this moment. NOTE: Primary vs. Secondary (or trailing) point set.
Where are the primary and secondary points on a distributor?
How does a single point distributor change dwell?
There is another effect which makes adjustment easier. A change of points gap induces a change in spark timing along with change of dwell. With single points you set the contact gap first, then run the engine (or spin the distributor) to check dwell, then re-adjust the points (if necessary) to get the correct dwell.
Why are dual point distributors used on high performance engines?
Dual point distributors were used on high performance engines back in the day before electronic ignitions. A dual point system has two sets of points, slightly offset, driving one coil. The purpose of the dual points is to increase the dwell and allow wider point gaps.
For Dual Point distributors there is a bit more effort involved. You can still set the point gap on the “primary” point set in the distributor (see note below), but you might as well forget the secondary point set at this moment. NOTE: Primary vs. Secondary (or trailing) point set.
How do you set points on Mallory twin point?
You need to set one set of points at a time, place a small piece of cardboard between the contacts of the other set to disable them. The engine needs to be running to check you’ve got it right. Make sure to reset the ignition timing once you’ve done the points.
There is another effect which makes adjustment easier. A change of points gap induces a change in spark timing along with change of dwell. With single points you set the contact gap first, then run the engine (or spin the distributor) to check dwell, then re-adjust the points (if necessary) to get the correct dwell.
How do you set a dual point ignition?
To set dual point ignitions you first block the “secondary” point set. You can block it by either not having it in the distributor, or using a thin piece of cardboard such as a matchbook cover between the contacts of the secondary point set.