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boosted79 boosted79 is offline
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Join Date: Jan 2015
Posts: 1,337
It's a matter of semantics. The vacuum pot retards timing under vac, boost pot retards timing with boost pressure. Retard decreases as vac. decreases. When there is no vac and no boost the centrifugal advance mechanism and the static timing you set determines the timing.Here's the centrifugal advance and vac/boost retard curves for the two pot USA dizzy.

Old 08-07-2017, 01:09 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)