Nathan L

I've noticed since fitting my Forge Motorsport Dump Valve that I have a red goo around the vent holes.

Also where the valve has been venting at high pressure it has coated the nearby pipes in a thin layer.

I thought I had an ITG filter but having checked its the standard Orange Subaru Jobbie.

The goo is quite thin but is oily in feel

Is this normal or is something wrong?

Thanks

Nathan..

Pete Croney

Hi Nathan

A VTA dumpvalve vents the gas that comes through the intercooler. If you look at the pipe that goes between the airfilter and turbo, you can see smaller pipes attached to it. They vent the crankcase cases... which are full of hot oil vapour. Under normal driving, these gasses go into the engine and get burnt up.

When a VTA does its venting, these gasses will come out of the exit holes and the vapour will condense reforming oil drop lets.

On a recirc, these gasses get sent back into the intake pipe for another go around the system.

There was a thread about this a while ago and I expressed my concern about these gasses going back into the inlet pipe. In theory, they should enter the inlet pipe and go towards the turbo. However they enter the inlet pipe under a lot of pressure and may disperse in both directions.

The recirc vent is closer to the MAF than it is to the turbo and if the gasses do disperse in both directions, this may explain why some people have unexplained MAF failures.

With a VTA, these gasses are vented out and there is no chance of contaminating the MAF.

Nathan L

Thanks very much Pete

I now feel soooo much better. Thought I'd knackered something internaly and was seing the result.

Cheers

Nathan..

Mental note to self must read more threads on stuff like this.

BugEyed

Nathan

As ever, Pete's advice is correct. Why not change to an ITG and get a green discharge () and a lower loss filter?

Duncan

PS. My "tight git" VTA (std dump valve no longer connected to the recirc loop) gives a small green drip - how long till the lube gives in?

Nathan L

Duncan

YHM mate

Nathan..

Coogie

Nathan,

Forge use a red grease to lubricate the o-rings inside the valve for the piston. If your DV is new, its probably just venting out some excess grease. I wouldn't worry about it,

Nick.

Nathan L

Cheers for that one Nick, hadn't thought about that.

All I can do is drive the thing.

Nathan..