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Original Message
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| You need vacuum advance. |
| By Royce Peterson - 10/01/2001 1:13:52 PM; IP 152.163.205.61 |
Steve,
Centrifugal advance distributors are dumb for the street. They don't know anything except RPM. So if you set one for best performance at the strip it will ping like crazy under load on the street.
If you want it to run decent on the street a vacuum advance distributor is the only way to go short of installing a computer controlled knock sensor system. Get a good condition stock distributor, add a Pertronics points eliminator kit. Limit initial plus mechanical advance to the area of about 34 degrees or so. Remember that the vacuum advance is all gone at WOT because there is little or no vacuum. The vacuum advance should supply another ten degrees or so. Accel makes a nice adjustable vacuum advance unit, the Motorcraft units can also be adjusted using washers to limit advance. The vacuum advance will tailor your ignition advance curve based on load for the best possible street performance.
Now if you have lots of spare time and money MSD offers a knock sensor which can be used to retard the timing automatically in the event of detonation / spark knock. There are a variety of ways to implement this, check with MSD for your options if this is interesting to you.
I am running an MSD 6AL ignition with a stock vacuum advance distributor converted as I described above on one of my 427 stroker motors. It is magnificent under all conditions and the rev limiter saves the motor if I do anything stupid like miss a shift.
Good Luck,
Royce Peterson |
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