ported vacuum advance

ported vacuum advance
(PVA) A series of restriction devices between the distributor advance unit and the carburetor advance port to ensure that there is no vacuum advance during idle, but increasing ignition advance as the throttle opens

Dictionary of automotive terms. 2015.

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  • vacuum advance — A mechanism on the side of the distributor that automatically varies the instant at which the spark occurs as a function of intake manifold vacuum. Vacuum advance provides the additional advance that is needed when the engine is operating at part …   Dictionary of automotive terms

  • advance — [1] The act of changing the ignition timing so that the spark occurs earlier in the cycle. The opposite is retard. [2] It may refer to the device which makes this adjustment. Also see automatic advance centrifugal advance electronic spark advance …   Dictionary of automotive terms

  • vacuum — An enclosed area in which the air pressure is below that of the surrounding atmospheric pressure. See air valve carburetor constant vacuum manifold vacuum ported vacuum advance pulse vacuum hublock venturi vacuum …   Dictionary of automotive terms

  • Vacuum switch — Prior to effective engine computers, engine vacuum was used for many functions in an automobile. Vacuum switches were employed to regulate this flow, and were commonly controlled by temperature, solenoids, mechanically, or directly. They operated …   Wikipedia

  • vacuum delay valve — (VDV) a valve used by GM to bleed ported vacuum to the vacuum advance unit through a small orifice and control vacuum advance rate. Used to retard or delay the application of a vacuum signal. Also called delay valve …   Dictionary of automotive terms

  • thermal vacuum switch — (TVS) [1] measures either air/fuel temperature, underhood temperature, or coolant temperature, or a combination of any two to regulate the EGR valve accordingly. [2] A temperature sensitive switch that shifts the source of the advance from ported …   Dictionary of automotive terms

  • PVA — Acronym for ported vacuum advance …   Dictionary of automotive terms

  • Ignition timing — in an internal combustion engine is the process of setting the time that a spark will occur in the combustion chamber (during the power stroke) relative to piston position and crankshaft angular velocity. Setting the correct ignition timing is… …   Wikipedia

  • Chevrolet small-block engine — Chevrolet Small Block V8 engine Manufacturer: General Motors Production: 1955–2003 Successors: GM LT engine, GM LS engine Type: small block V8 265 Produ …   Wikipedia

  • thermal ignition control — (TIC) device used by Chrysler that shifts the vacuum advance vacuum source from ported vacuum to manifold vacuum when coolant temperature exceeds 225° F …   Dictionary of automotive terms

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