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Do throttle plates on most four barrel carburators open at the same time?
JohnSelnerfb6951
No, not unless needed. In short there are 4 holes. 2 are called Primaries and they would be the front 2 holes.. The back 2 holes are called secondaries. When just driving regular you run mostly on the Primaries unless you are over half throttle then the secondaries come in adding more gas and air to the mix for faster acceleration and gas consumption.
Some secondaries are vacuum operated and some are Mechanical. Vacuum operated ones only operate when there is a set amount a vacuum present (low vacuum).. The Mechanical one open regardless of vacuum but depend on how much throttle you are giving it.
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