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RE: You need vacuum advance. By Royce Peterson - 10/01/2001 3:15:34 PM; IP 152.163.201.69 Steve, MSD does not sell the knock sensor itself, you have to use one from a late model Ford or GM in conjunction with the MSD#8982 Start / Retard single stage timing retard control. This unit has a control circuit which needs a ground to complete the circuit to trigger a preset amount of ignition retard. The knock sensor provides a ground to trigger the unit. Different modules plug into the retard control to provide the retard level desired. You must also have a MSD 6 or 6AL unit. MSD also makes a variable timing control that has a simple knob to control timing, this might also be an option for the techno geek FE lover. Once again you need a 6A or 6AL MSD box to plug into. All this is a lot of work, expense and complexity compared to the vacuum advance unit. I like them best connected to the ported vacuum on the carb. Mine is an 8V setup so the hose is connected to the front carb. Royce Peterson

This thread, so far...

Skip Navigation Links.  '67 Shelby 428 "pings" under load...need help -- Steve Boulay, 10/01/2001  RE: '67 Shelby 428 "pings" under load...need help -- Morgan, 10/01/2001  You need vacuum advance. -- Royce Peterson, 10/01/2001  RE: You need vacuum advance. -- Steve Boulay, 10/01/2001  RE: You need vacuum advance. -- Steve Boulay, 10/01/2001  RE: You need vacuum advance. -- Royce Peterson, 10/01/2001 RE: You need vacuum advance. -- Royce Peterson, 10/01/2001  RE: '67 Shelby 428 "pings" under load...need help -- Mel Clark, 10/02/2001

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