What are these pipes for?

[ElEsprito]

Hi all, I'm figuring out the plumbing in my car as it is while ago since I took it apart: I have two pipes running front to back in the central tunnel (at the bottom), they are not for cooling I think, but what are they for? At the front of the car they seem to go upward in the direction of the dashboard. I've checked the workshop manual but don't see them mentioned. I think they are for heater control (vacuum?) and at least one is supposed to be connected to the inlet manifold I guess?

Thanks in advance for your help!

Dennis

[Paul Coleman]

Sounds good to me - large one for the heater and small one for the servo.

Paul.

[ElEsprito]

Hi Paul, 'servo'? as in brake servo? didn't know my car had one.

Any idea about the engine bay routing of these pipes?

Edited January 10, 2012 by ElEsprito

[Paul Coleman]

Yes brake servo, the pipe goes up through the body into the bonnet/trunk. The heather pipe (plus another one t'eed off the large pipe) go into the cabin. Haven't got any clear pictures I'm afraid.

Paul.

[ElEsprito]

Great info Paul, thanks. Do you know where these pipes attach to in the engine bay (I have the engine out & don't recall).

[Paul Coleman]

Buggered if I can remember! I took mine apart 5 years ago and when/if I ever get round to putting it back together I'm going to have the same problem!! The servo one goes to the inlet manifold as you previously said and the heater one is probably t'eed off another pipe somewhere but I don't remember where. There should be a picture in the parts manual I would have thought?

When you find out, let me know

Cheers, Paul.

[molemot]

Not sure about the S1...but the heater pipes on my S3 Turbo attach to the water pump and the feed comes from the back of the cylinder head, to the left of the carbs. There should be two pipes through the chassis for the heater, feed and return, and also two other pipes ..vacuum supplies...one to the brake servo and one for the heater flap operation. There is a vacuum reservoir on the top of the RH fuel tank and the suck comes from the inlet side of the engine...there's a steel pipe which joins all the chokes, thus producing constant suck, and the hoses from this go down past the alternator to their respective destinations.

[Paul Coleman]

The S1 is quite different by the sounds of it John - my car only has 4 pipes running through the chassis. Two are big bore for the radiator flow and return, there is a single one for the heater and a single one for the servo. The other heater pipe is t'eed off the big bore one at the front of the car near the radiator. The rear brake pipe and the clutch pipe run on the outside of the chassis.

Paul.

[ElEsprito]

Yes, the S1 seems quite different. Bummer I forgot to take note of this. I'll see if I can find out about the servo vacuum now that I know what to look for in the manual.

[Paul Coleman]

You can see most of the pipes on this...

Paul.

[ElEsprito]

Hi Paul, are you referring to a picture, as I don't see it in your post?

[Paul Coleman]

Hmmm... I can see it?

Paul.

[ElEsprito]

Hi Paul, yes I can see it now (different computer). That's looks splendid! However, what does the servo hose connect to in the engine bay is what I'm looking for. Unfortunately, the workshop manual seems persistent in not wanting to reveal this....

[ramjet]

Don't you just hate those persistent pesky service manuals?

[Paul Coleman]

It goes to the plastic one way valve on the booster.

Paul.

[ElEsprito]

Paul, seems we don't understand eachother. What you are telling me is where is connects in the front of the car, but I need to know where the other end of the pipe connects to in the back of the car....

Cheers

[Paul Coleman]

Ah sorry.

It goes to the inlet manifold but I don't think I have any pictures of mine

Paul.

[ElEsprito]

allright, does that mean that there are two vacuum connections to the inlet manifold: both for the servo and the heater control?

[Paul Coleman]

This'll be the one for the brake servo...

The heater one will probably be somewhere near the water pump I'm guessing.

Paul.

[gvy]

[vintaylor]

Hi Guys,

Can anyone tell me what this pipe is used for and if it can be replicated in aluminium.?

Cheers

Vin

Edited February 16, 2012 by vintaylor