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Author Topic: vacum tank  (Read 1389 times)

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nellys coupe

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vacum tank
« on: 30 March 2019, 21:00:26 »
hi folks iam wondering what the vacum tank that sits below the maf sensor does.? ;)
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Nick W

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Re: vacum tank
« Reply #1 on: 30 March 2019, 21:08:21 »
Quote from: nellys coupe on 30 March 2019, 21:00:26
hi folks iam wondering what the vacum tank that sits below the maf sensor does.? ;)


It provides a reservoir for all the important vacuum systems. Multi-rams, assorted solenoids and the HBV.
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Enceladus

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Re: vacum tank
« Reply #2 on: 30 March 2019, 21:20:00 »
That vacuum reservoir is part of the multiram air intakes. Purpose of the multram is to flatten the torque curve.
There's a guide available here
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nellys coupe

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Re: vacum tank
« Reply #3 on: 30 March 2019, 21:27:48 »
yes just found it so looking at it i can convert my old system to the later one. which will make my thing ive got planned for the engine bay alot easyer. :y
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Andy H

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Re: vacum tank
« Reply #4 on: 30 March 2019, 21:41:59 »
The vacuum system also powers the heating and ventilation controls and the brake servo. The brake servo is itself a vacuum reservoir.

Oldest system has one vacuum reservoir/tank, newer system has two (one does engine, the other does heat & vent).

Pre-facelift have a vacuum operated valve for the secondary air injection (SAI), this was deleted on the later cars.

They are needed because the inlet vacuum disappears on full throttle so without the reservoirs you lose heating controls and multiram flap control. (you can dispense with the SAI plumbing with no penalty other than it will take longer for the cats to warm up)
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nellys coupe

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Re: vacum tank
« Reply #5 on: 31 March 2019, 19:35:14 »
Quote from: Andy H on 30 March 2019, 21:41:59
The vacuum system also powers the heating and ventilation controls and the brake servo. The brake servo is itself a vacuum reservoir.

Oldest system has one vacuum reservoir/tank, newer system has two (one does engine, the other does heat & vent).

Pre-facelift have a vacuum operated valve for the secondary air injection (SAI), this was deleted on the later cars.

They are needed because the inlet vacuum disappears on full throttle so without the reservoirs you lose heating controls and multiram flap control. (you can dispense with the SAI plumbing with no penalty other than it will take longer for the cats to warm up)
iam going to keep the one that does the heater, but i want to loose the one that is mounted at the front of the engine. :y
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Andy H

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Re: vacum tank
« Reply #6 on: 31 March 2019, 19:51:27 »
Quote from: nellys coupe on 31 March 2019, 19:35:14
Quote from: Andy H on 30 March 2019, 21:41:59
The vacuum system also powers the heating and ventilation controls and the brake servo. The brake servo is itself a vacuum reservoir.

Oldest system has one vacuum reservoir/tank, newer system has two (one does engine, the other does heat & vent).

Pre-facelift have a vacuum operated valve for the secondary air injection (SAI), this was deleted on the later cars.

They are needed because the inlet vacuum disappears on full throttle so without the reservoirs you lose heating controls and multiram flap control. (you can dispense with the SAI plumbing with no penalty other than it will take longer for the cats to warm up)
iam going to keep the one that does the heater, but i want to loose the one that is mounted at the front of the engine. :y
You need some kind of vacuum reservoir to serve the multiram flaps otherwise it WILL kill the full throttle response.
It doesn't need to live on the back of the radiator fans - it would fit nicely in the space where the power sounder hides
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nellys coupe

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Re: vacum tank
« Reply #7 on: 31 March 2019, 21:40:10 »
iam going to plum it the same as later cars, :y
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