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[paintshoptec]

the front vac tank which sits at the bottom of the rad is no good
so ive joined the vac pipes together and the multi-ram now works
do i need to replace the vac tank or will it be ok to leave it of
neil

[Darth Loo-knee]

the front vac tank which sits at the bottom of the rad is no good
so ive joined the vac pipes together and the multi-ram now works
do i need to replace the vac tank or will it be ok to leave it of
neil

Would have though it needed to be on mate else why would Vauxhall put it on in the first place... have you looked in the Parts For Sale section???

[Marks DTM Calib]

It needs to be there in order to ge good throtle response.

The tank acts as a vac reservoir because at wide throttle openings the engine vac drops off rapidly, this will cause the multirams to stop functioning again.

So yes, you need the vac tank and it needs to have a working one way valve in it.

[Darth Loo-knee]

It needs to be there in order to ge good throtle response.

The tank acts as a vac reservoir because at wide throttle openings the engine vac drops off rapidly, this will cause the multirams to stop functioning again.

So yes, you need the vac tank and it needs to have a working one way valve in it.

Well which is the pipe that you can put a Fish Tank one way valve in Mark? Is this what you can do when the Vac Tank isn't working properly or am I getting mixed up with something else

[Matchless]

one way valve goes in the pipe from the brake servo connection. Make sure you fit it the right way round.

[omegabeast]

Mine is properly buggered then aswell.

Is it probable its an air leak or is it probable the vac tank is knackered?


Matt

[Darth Loo-knee]

one way valve goes in the pipe from the brake servo connection. Make sure you fit it the right way round.

So let me just get this right then the one way valve would go on the pipe between the Brake Servo and the T piece? and the air flow is running from the Servo to the T piece?

So why would you put that in? sorry to sound like Tim Nice but Dim

[Matchless]

Mark has posted the vac pipe layout in the Maintainance Guide section (here) http://www.omegaowners.com/forum/YaBB.pl?num=1152565204

Remember that the system works on vacuum, ie "suck". The pipe from the servo line connects to the vac. reservoir via the in-built non-return valve or your fish tank one, note that the flow is from vac tank to servo pipe.
The vac tank output connects to the T piece, one arm of which connects to the front multiram valve and the other to the rear multiram valve.

When an engine is operating under load it generates very little manifold vacuum so any vacuum operated device would struggle to work when going up hill etc ( ever seen an older car with vacuum wipers? they stopped working when going up hill !). The vacuum tank is there to store the vacuum and get around this problem, the non-return valve allows the engine to suck air out of the reservoir when under light load but shuts if the manifold pressure is higher that that inside the reservoir when accelerating or climbing etc.  HTH