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[Datsun 1200 encyclopedia]


From Datsun 1200 Club

Datsun 1200 encyclopedia | Recent changes | Edit this page | Page history | Switch to MediaWiki mode

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Categories: Brake Modifications | Fuel System

Also See: Vacuum Advance

vacuum reservoir

Since twin Weber manifolds have no Plenum, there is no place to get a steady vacuum signal. The reservoir is usually connected to all four intake runners and acts as a Plenum for vacuum. Connect the brake booster and vacuum gauge to the reservoir.

Larger ones also function as a Vacuum Reserve Canister. So when pulling a long hill you don't run out of vacuum for the brakes. Because vacuum is not made at heavy throttle it stores a little extra as a reserve.

If it's multi carb then you need a vacuum manifold (a tube to each runner connected to single reservoir) . Connect the distributor to the reservoir.

Use a vacuum reservoir about the size of two golf balls

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