Hot rodding the HEI distributor
m (→Initial advance) |
m (→Ignition advance) |
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| Line 179: | Line 179: | ||
The initial, centrifugal and vacuum advance work together overall but are independent of each other; each adds the appropriate amount of timing advance to supply the correct spark advance to the engine under all RPM/engine load conditions. | The initial, centrifugal and vacuum advance work together overall but are independent of each other; each adds the appropriate amount of timing advance to supply the correct spark advance to the engine under all RPM/engine load conditions. | ||
| − | *'''Initial timing''' is the amount of timing advance before the mechanical or vacuum advance is added in. | + | *'''Initial timing''' (aka ''base timing'')is the amount of timing advance before the mechanical or vacuum advance is added in. |
*'''Total timing''' is the initial timing plus the mechanical timing. | *'''Total timing''' is the initial timing plus the mechanical timing. | ||
*The '''vacuum advance'''- while important- is usually considered separately from total advance in most discussions on setting up a performance timing curve. In other words, you might hear "the engine runs best with 38 degrees total advance". That's '''initial''' plus '''mechanical''' advance; the amount of vacuum advance isn't added to that figure. | *The '''vacuum advance'''- while important- is usually considered separately from total advance in most discussions on setting up a performance timing curve. In other words, you might hear "the engine runs best with 38 degrees total advance". That's '''initial''' plus '''mechanical''' advance; the amount of vacuum advance isn't added to that figure. | ||
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