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[Webby the Bear]

..going to tee in my new vacuum gauge off the main brake servo pipe. but the diameter of the vacuum line that came with my gauge is a bit too big to fit over those tiny diameter omega lines.

so when I order a length of rubber vacuum line that will fit over the omegas thin line, do I tell them the diameter of the omega vac lines (the really thin ones)? or what?

tia 

[05omegav6]

Engine off, pump the brake pedal until solid, the carefully pop the vac fitting out of the brake servo... will your pipe fit this comfortably?

Obviously driving the car in this state will be near suicidal, so best not do that, but if it fits it will suffice for stationary test purposes

Also changing the diameter might affect the reading, but wiser folk can confirm that

[Webby the Bear]

Thanks Taxi.

sorry though, im confused 

the vacuum gauge I want to fit in line with the vac system. the gauge came with a tee piece so ill have this...



the two rubber ends are too big to accept the thin omega lines so I figured I need to swap these two ends to thinner diameter (the same diameter that the 90 degree bends are in the omega vacuum system)

 

[05omegav6]

Ah... a picture

Ok, ignore my suggestion

[Webby the Bear]

No worries mate, thanks for the input 

I suppose another way of putting it. . .

What diameter are the elbows on the omega vac system? 

[Nick W]

Why not use one of the non-engine fittings like HBV or SAI?

[Webby the Bear]

Why not use one of the non-engine fittings like HBV or SAI?

Only cos I didn't want to run in to trouble if one decided to break that's all 

[Nick W]

What are you going to break? Remove the silicone sleeve from the SAI(as it's easiest to access), and plug the gauge into it.

[Webby the Bear]

fair point mate, ill do that  cheers nick 

[Andy H]

I think you should be OK with 3.5mm or 4mm.

What you want to see on the gauge is manifold pressure (or vacuum). The SAI and the heater controls are fed with vacuum from the vacuum reservoir(s) which have non-return valves to hold the vacuum when the manifold vacuum disappears (eg when you have the throttle wide open).

You need to connect to one of the pipes before a non-return valve.

[flyer 0712]

I bought some tubing for my previous omega when i was having trouble with the heater....the tubing size was 3.5mm which went over the outside diameter of the two plastic air tubes that go through the bulkhead to the air valves just to join them together and it did the trick...if this is what you want then i have a bit left and i would gladly post it to you for you to try..

[Webby the Bear]

Thanks guys that's really helpful 

I was going to tap in to the line that comes off the main brake servo pipe that goes to the hbv . That has to be constant manifold vacuum, right?

[Andy H]

Thanks guys that's really helpful 

I was going to tap in to the line that comes off the main brake servo pipe that goes to the hbv . That has to be constant manifold vacuum, right?

The HBV is controlled by a solenoid valve in the climate control system. Not what you need.

The best place to tap in would be one of the small pipes that come off the side of the non return valve in the half inch vacuum pipe to the brake servo.

[Webby the Bear]

Thanks guys that's really helpful 

I was going to tap in to the line that comes off the main brake servo pipe that goes to the hbv . That has to be constant manifold vacuum, right?

The HBV is controlled by a solenoid valve in the climate control system. Not what you need.

The best place to tap in would be one of the small pipes that come off the side of the non return valve in the half inch vacuum pipe to the brake servo.

That's what I was going to do mate 

Just so we're clear this is the spot, right?

[Andy H]

Thanks guys that's really helpful 

I was going to tap in to the line that comes off the main brake servo pipe that goes to the hbv . That has to be constant manifold vacuum, right?

The HBV is controlled by a solenoid valve in the climate control system. Not what you need.

The best place to tap in would be one of the small pipes that come off the side of the non return valve in the half inch vacuum pipe to the brake servo.

That's what I was going to do mate 

Just so we're clear this is the spot, right?

That's the spot