What is the purpose of a dual point distributor?
What is the purpose of a dual point distributor?
Dual Points were used to achieve higher rpms with points, they used half the lobes on the distributor and the points were offset allowing the points not to bounce at high speeds.
How do you set up dual points?
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.
How many points does a dual point distributor have?
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. A standard Ford single point distributor has about 28 dwell with a .014″ point gap. A Ford dual point has 33 with a .019″ gap.
What’s the second point on a dual point ignition?
The second one that opens is called the secondary (or trailing) point set. When the primary point opens, watch it before it closes, the secondary point will open. To set dual point ignitions you first block the “secondary” point set.
Is the dwell of dual points too low?
Not too low. They are working as advertised. Of course the dwell is going to be less if you eliminate the secondary, than with dual points, that’s the purpose of the dual points, to increase dwell. Click to expand…
What kind of engine did the 1962 Corvette have?
For one, the ‘62 Corvette was the first model year to incorporate the 327 cubic inch V-8 engine in place of the smaller 283 cubic inch engine. Though technically the same engine block as the 283, the smaller engine was bored and stroked to bring its cylinder dimensions to 4.00 x 3.25 inches and it’s displacement up to 327 cubic inches.
When do you set the dwell on a point engine?
You read above that the ignition timing is the last thing to set when tuning the engine. Your dwell, and thus your points gap, needs to be set before you get out the timing light. To set the dwell, remove the distributor cap and rotor, ground the coil wire and remove all the spark plugs from the engine.
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.
What was the compression ratio on a 1962 Corvette?
The Duntov cam would also be placed in the top “fuelie” (fuel-injected) engine that year. Both of the engines sporting Duntov cams ran a tight 11.25:1 compression ratio, which was a considerable step up from the base level and mid-level 300 horsepower engines, which ran a more conventional 10.5:1 compression.
