air box pipes

[marcus1970]

Two pipes going into the driver side air box. One drips oil and the other smells of petrol...

What are they for, that is, what purpose do they serve and what would be the downside if they wern't there at all.

Cheers

MB

[Sparky69]

The big ones the engine breather gets ride of the toxic fumes produced by the hot oil very important. puts them into the air box to be burnt of. don't know what the smaller one is for.

[marcus1970]

Anyone know what the little one's for then?

MB

[brogenville]

Am I the only cerb owner here thats read this and thought: "hmmm, I've only got the big hose (oil breather) on my air box... I wonder what he's on about with that little hose".

I cant help you.. but I am interested!

[marcus1970]

brogenville said:

Am I the only cerb owner here thats read this and thought: "hmmm, I've only got the big hose (oil breather) on my air box... I wonder what he's on about with that little hose".

I cant help you.. but I am interested!

You've got me worried now.

Come on experts what's it for, or have I got a "special" cerb?

MB

[Peppe]

There should be a small hose that is connected to one of the airboxes. The hose goes to the barometric pressure sensor that is located inside the car under the dashboard (passenger side).
The pressure sensor is connected to the ECU.

Peppe

[marcus1970]

Peppe said:

There should be a small hose that is connected to one of the airboxes. The hose goes to the barometric pressure sensor that is located inside the car under the dashboard (passenger side).
The pressure sensor is connected to the ECU.

Peppe

This one is on the driver's side and connects just above the large oil breather pipe...

Any further ideas?

MB

[jonbarrett]

I know that hose well because the spigot has popped out of the air box and I need to fix it back in today. I've never bothered to trace it. I'll take a look this afternoon.

[mikesr]

The small hose connects to a 4 way connector that sits above the coil packs. 2 other hoses connect it to the inlet manifolds. The fourth goes to the rear N/S wheel arch and connects to the carbon cannister via the purge valve. I've no idea what it (the hose to the airbox) was meant to achieve.

Sounds like a few cars don't have the small hose. IIRC Trackcar believes it just makes the idle rough. Removing it and replacing the 4 way with a 3 way and plugging the spigot on the air box might help smooth out the engine at low rpm.

The hose from the crankcase puts far too much oil into the air box. So I bought an oil catch can a few months ago to fit betwixt the crankcase and the air box or even just vent to atmosphere via a filter. But haven't got around to doing it yet. Maybe I'll finally get it done over the winter when I've dismantled the front end.

[marcus1970]

mikesr said:

The small hose connects to a 4 way connector that sits above the coil packs. 2 other hoses connect it to the inlet manifolds. The fourth goes to the rear N/S wheel arch and connects to the carbon cannister via the purge valve. I've no idea what it (the hose to the airbox) was meant to achieve.

Sounds like a few cars don't have the small hose. IIRC Trackcar believes it just makes the idle rough. Removing it and replacing the 4 way with a 3 way and plugging the spigot on the air box might help smooth out the engine at low rpm.

The hose from the crankcase puts far too much oil into the air box. So I bought an oil catch can a few months ago to fit betwixt the crankcase and the air box or even just vent to atmosphere via a filter. But haven't got around to doing it yet. Maybe I'll finally get it done over the winter when I've dismantled the front end.

Thanks for that - excellent information...

Just one more, what does the hose actually carry ?

MB

[mikesr]

AFAIK it just carries a bit of fuel vapour from the inlet manifolds.

Why it would need to do be there, no idea. C

an any real experts out there explain what it is supposed to achieve?

[marcus1970]

mikesr said:

The small hose connects to a 4 way connector that sits above the coil packs. 2 other hoses connect it to the inlet manifolds. The fourth goes to the rear N/S wheel arch and connects to the carbon cannister via the purge valve. I've no idea what it (the hose to the airbox) was meant to achieve.

Sounds like a few cars don't have the small hose. IIRC Trackcar believes it just makes the idle rough. Removing it and replacing the 4 way with a 3 way and plugging the spigot on the air box might help smooth out the engine at low rpm.

The hose from the crankcase puts far too much oil into the air box. So I bought an oil catch can a few months ago to fit betwixt the crankcase and the air box or even just vent to atmosphere via a filter. But haven't got around to doing it yet. Maybe I'll finally get it done over the winter when I've dismantled the front end.

Mike,

What oil catch can did you buy and does it fit the breather hose without any mods?

Cheers

MB

[mikesr]

I got the catch from RatSport

Its a pain to connect up. I got a 22mm to 16mm reducing elbow silcon hose to connect to the engine and a 16mm to 12 mm reducing straight connector. Still haven't fitted it but I think it will work.

I was planning on venting it through a filter (as per the image on the Ratsport site) and removing and closing off the 'catch can' on the air box. So it wouldn't need to connect back to the air box. If it is connected in then the reduction in hose diameter has to be reversed - or use the smaller inlet if the other hose is removed.

However, that prevents the scavenging effect of the air intake actively removing the gases from the cam box. Not sure thats such a good idea.

mikesr

[marcus1970]

mikesr said:

I got the catch from RatSport

Its a pain to connect up. I got a 22mm to 16mm reducing elbow silcon hose to connect to the engine and a 16mm to 12 mm reducing straight connector. Still haven't fitted it but I think it will work.

I was planning on venting it through a filter (as per the image on the Ratsport site) and removing and closing off the 'catch can' on the air box. So it wouldn't need to connect back to the air box. If it is connected in then the reduction in hose diameter has to be reversed - or use the smaller inlet if the other hose is removed.

However, that prevents the scavenging effect of the air intake actively removing the gases from the cam box. Not sure thats such a good idea.

mikesr

Did you get the other parts from RatSport also?

How great is the scavenging effect of the air intake on the oil breather?

Cheers

MB

[mikesr]

No, I got the silicon elbow from GPR or Demon Tweeks and the other bits from a local motor factors.

If I ever get around to making a bracket to bolt onto the cam box I'll be able to fit it.

I think the scavenging effect will be significant - given the amount of oil sludge in the O/S air box.

mikesr