The distributor was pulled so it could be disassembled. Before the disassembly of the distributor, we tested the centrifugal advance on a Sun distributor machine. The welded areas were resized with a triangle shaped file to achieve a pair of shorter rectangle shaped slots. Top Left: A new vacuum canister was installed. Top Right: The two screws that held the vacuum canister to the distributor housing were torqued into place. Bottom Left: The governor plate was retained with the small snap ring.
Installing the ring takes some finesse to slip the snap ring onto the shaft. Bottom Right: The reluctor wheel slid into place, and the locator roll pin was installed to secure the wheel to the distributor shaft. We filed each slot to a measurement of 0. We cleaned the distributor, reassembled, and then tested on the Sun distributor machine.
Content with our work, the distributor was re-installed, and the timing was checked with the dial-back timing light.
The runs quickly proved that the governor weight springs were not ideal for our application. There was detonation in the mid-range rpm , so spring changes were required to slow down the centrifugal advance at that rpm range. Top Left: An oil felt was dropped into the opening in the governor plate.
This keeps debris out of the shaft area and provides a minimal amount of lubrication for the distributor shaft. Top Right: The air gap between the reluctor wheel and the magnetic pickup was measured with an.
Bottom Left: The shim, drive gear, and roll pin were installed on the distributor shaft. A small punch and hammer drove the pin into place. Bottom Right: The modified distributor was now ready to test.
The distributor was pulled, partially disassembled, and the springs were swapped. The distributor machine tested the spring changes until a combination of two different springs resulted in what was deemed a proper centrifugal advance curve.
We tested the new advance curve on the dyno, and after several more fine-tuning spring swaps, we had exactly what worked with our slant six.
The Sun machine was used to plot points every distributor rpm for notation and future reference. The distributor was reinstalled into the engine for the final time. The total advance was all in by rpm Table 1. Top Left: The Dart was ready for more torture on the Mustang chassis dyno. Top Right: Table one presents us the difference in timing curves between the stock and modified distributors. Bottom Left: An updated Sun distributor machine was used to provide all the distributor curve information necessary for all the tests.
Bottom Right: We tested many different combination of springs from stiff to soft as you can see here. The Dart was put through its final series of three runs on the dyno with the same rpm range employed during the baseline runs. With an Peak horsepower was up 14 hp resulting in a The average torque rose by Our goal was achieved with methodical testing and excellent note taking.
We started by verifying the TDC timing chain cover mark was truly lined up with the TDC mark on the harmonic balancer. We determined the minimum initial timing and centrifugal advance needs of the Slant We then disassembled, cleaned, modified, and reassembled the distributor limiting governor weights and the centrifugal timing, which allowed more initial timing. The use of a Sun distributor machine provided quick evaluations our modifications and our spring selections. Bottom Left: Graph 3 shows a comparison of the best baseline run vs.
Far Right: Table 2 list the amount of slot lengths compared to distributor and crank shaft advancement. In the end, all of the work and the 20 bucks we spent for springs was well worth it.
We gained double-digit increases in peak torque and horsepower. The additional benefits of these mods are the immediate starting of the engine without excessive cranking, and the engine feels peppier with great driveability characteristics while remaining extremely docile.
For many, access to a distributor machine may be a challenge, but the same procedures detailed in this article can be performed. It will require removing and installing the distributor for every spring change evaluation and a desolate road or preferably a drag strip to perform the acceleration tests. There are some nearly free ponies sitting under the hood. All that has to be done is get into the garage and work to find them.
Be sure to check back for a future article about tuning economy into our performance ignition. Chris owns a '67 Dart, a '75 Dart, a '06 Charger, a '12 Cummins turbo diesel Ram, and he is a multi-time track champion drag racing with his '69 Dart, which he has owned 32 years.
I ended up using a relatively light seven-coil spring and a heavier five-coil spring. If your engine is or later and has an EGR valve, remove the rubber hose from it and plug it with a pencil. Use a wrench to loosen the distributor hold-down bolt. Loosen it just enough so that when you try to turn the distributor it is hard to turn.
Otherwise, it will turn by itself when you start the engine. Hook up the timing light to the engine with the spark plug pick-up clipped over the No. The power wires are clipped to the battery. The black one on the negative "-" terminal. Make sure the timing light wires are clear of the fan, belts, and pulleys. Start the engine and aim the timing light at the timing tab. You will see the notch in the pulley appear to float next to a number on the timing tab.
Turn the distributor to make the notch line up with the timing value specific to your engine. This information is usually on a sticker by the radiator support. A typical setting for and later engines is 12 degrees before top-dead-center. Its very important to find the specific setting for your year engine.
The attention to quality and detail requires us to build each unit per order, and due to this process orders can take several days to complete before shipping out.
During our busy season March-September , build times can take slightly longer. You must be logged in to post a review. Dodge Slant 6 Tri-Power Distributor quantity. The Tri-Power Ignition System is covered by a one year warranty from date of purchase.
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