Msd Vacuum Advance Adjustment

These msd vacuum advance mechanisms are designed to replace the vacuum advance chamber on the msd hei distributor.

Msd vacuum advance adjustment. At idle a spark ported vacuum system provides zero vacuum advance where the older manifold vacuum advance system might have provided as much as 10 12 degrees additional timing. At 2 800 rpm the combination of initial and mechanical deliver 36 degrees. The correct adjustment of a vacuum advance unit is critical to ensure that an automobile engine runs at its peak performance. Msd distributors are supplied with the heavy slow advance springs and the 21 stop bushing installed.

Find msd vacuum advance mechanisms 8463. Given the slew of variables most high performance or race distributors do not make use of vacuum advance case in point is the msd pro billet distributor shown in the. Find msd vacuum advance mechanisms 8463 and get free shipping on orders over 99 at summit racing. This vacuum canister produces 13 14 degrees of advance but requires 14 inches of vacuum to deliver its maximum timing.

The vacuum advance mechanism allows the distributor to vary the spark timing to compensate for the load and speed requirements of the engine. They are made of steel and feature cadmium plating for maximum durability. The vacuum line should be routed to a ported vacuum outlet above the throttle plates.