Carb vacuum port ID
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If you have an automatic transmission that uses a vacuum modulator, this also uses a manifold vacuum source. Often the factory used a fitting with a restricted orifice that was fitted to the intake manifold for this but you can use a port on the carb. | If you have an automatic transmission that uses a vacuum modulator, this also uses a manifold vacuum source. Often the factory used a fitting with a restricted orifice that was fitted to the intake manifold for this but you can use a port on the carb. | ||
| − | + | ==EGR vacuum== | |
The EGR port will not have as much vacuum at idle as a manifold port- but it will have enough vacuum to register on the gauge, unlike a ported vacuum port that will show less or no vacuum at idle (unless the primaries are open too far due to a low vacuum cam, as explained above). Because of where the EGR port picks up its vacuum signal (from the venturi as opposed to just above or just below the throttle blades), it will tend to show more vacuum on the gauge as the engine speed/throttle angle increases. | The EGR port will not have as much vacuum at idle as a manifold port- but it will have enough vacuum to register on the gauge, unlike a ported vacuum port that will show less or no vacuum at idle (unless the primaries are open too far due to a low vacuum cam, as explained above). Because of where the EGR port picks up its vacuum signal (from the venturi as opposed to just above or just below the throttle blades), it will tend to show more vacuum on the gauge as the engine speed/throttle angle increases. | ||
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