Does Vaccum's in Engine manifold improves pick ?

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Does Vaccum's in Engine manifold improves pick ?

I have a Cultus 86, 93 reconditioned .. almost like khyber , same 997cc , 3 cyclinder , but my car is sports version 2 door model , so the Carberator in my cultus is slightly bigger than that of normal KHYBER and i was surprised to find out that there are 2 vaccum nozzles in my engine Manifold ( RITE BELOW THE CARBERATOR ) ... and nozzles have been closed by some machanic , when i opened the nozzles the RPM Increased and the engine went smooth and the pic increased as those vaccums started SUCKING FRESH AIR , so i wanted to know IF ANYONE OF YOU GUYZ HAVE VACCUMS in their car manifolds or KNOWS WHERE DO THEY CONNECT OR ARE THEY SUPPOSED TO JUST SUCK FRESH AIR OR ARE THEY Supoosed to be Blocked ? ... because Air FILTER also sucks so whats the point of Vaccums in the manifold.. pls HELP ..WHAT DO I DO?

Gari.pk User 4973 asked on 22 Jul 2010 12:22:59 pm

1 Answer

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Samar - on 22 Jul 2010 12:23:13 pm

intake manifold vacuum is used to determine pressure differential and is useful for operating bunch of things manually like fuel amount in carburation and gear changes in not computerized automatic transmission. Dont mess with these unless you know what you are doing. You engine sucking air bypassing air filter is destructive to your engine

Definition: Low pressure in an engine intake manifold formed just below the throttle plates. Manifold vacuum is highest at idle and drops under acceleration.

It is a vacuum leak somewhere in the system. Vacuum supplies a lot of functionality in the car. It supplies vacuum for the power brakes, the cruise control servo, the heater controls, the EGR valve, the PCV valve, the carburetor (if you have one) and the transmission modulator. Each of these can be the source of a "vacuum leak". Normally there is also a performance problem associated with a true vacuum leak.