Ive been a busy boy at the mo tinkering with my MY05 Scoob, one mod I've done is a dual Oil Catch Tank setup. I also gave the Intercooler a good clean when it was off as well.

Heres what I used...

* 2x Oil Catch Tanks off eBay with two 15mm inlet ports each
* 15mm ID Black Heater Hose - Approx. 5m in total
* 1x 15mm 90 degree Elbow pipe fitting from cbsonline.co.uk
* 1x 19mm 90 degree Elbow pipe fitting from cbs
* 1x 19mm to 15mm inline reducer pipe fitting from cbs
* 1x Oil Sump Plug Bolt / Nut from Halfords (used to plug the hole in the Throttle Body in place of the PCV Valve). - Halfords model - HSP-603. (99% sure) Has a 19mm head I think.
* PTFE Tape for sump plug
* Jubilee Clips to suit Heater Hose from Halfords
* Cable Ties from Halfords

(Intercooler Clean)

* Petrol
* Engine degreasent
* Soapy water

After researching into the catch tank mod I found that many people recirc'd the clean air from the Oil Catch Can back into the Intake system to preserve pressure. The alternative is to vent the Oil Catch Tank outlet to the atmosphere, whilst this means the vented air from the engine goes no where near the intake, pressure (I am told) is a good thing to keep as this replicates the factory setup. The brucie bonus is that you are catching the oil before it enters back into the system.

Also, I went for a dual tank setup - one for the Crankcase vent and one for the heads vent - although there may not be any evidence to support a dual setup being better, again I wanted to keep them separate and maintain the factory-like setup.

Another point I looked into was the PCV Valve - whether to keep it, or not. Basically, the vent from the Crankcase goes into a T junction, one way leads to the Throttle Body via the PCV Valve. The other route directly into the air intake pipe. When NOT under boost pressure the PCV Valve mounted on the Throttle Body remains open allowing crankcase air to vent into the intake route and also straight into the Throttle Body. When you step on the gas, the boost pressure forces the PCV Valve closed and all crankcase vented air goes into the intake pipe only. The mod is to remove the PCV Valve on the back of the Throttle Body and plug it tight with a same size bolt. (The bolt was definately a sump plug bolt / nut from Halfords, its not on the Halfords website but I think it was model HSP-603 with a 19mm bolt head.) I also put some PTFE tape on the new bolt thread to create an air tight seal in the throttle body hole. The crankcase vent then goes into the catch tank then back into the intake pipe.















As you will see from the photos above, the aim is to re-route the two vent points into one - or in my case - two catch cans. If you only want one catch tank, link the two incoming catch can pipes together with a T peice and have one catch tank outlet going to one hole in the intake pipe. Remember to plug the 2nd open hole in the intake pipe if you do this.

The fiddly vent to reach is the Crankcase one, its located directly below the turbo-to-intercooler connection pipe behind the intercooler body. If you look at your engine bay its underneath the throttle body linkages on the left side of the throttle body. There is a T peice linking the PCV Valve and the intake pipe.

Remove the intercooler, unbolt the intercooler pipework and give it a good clean through with petrol and then soapy water. Ensure its COMPLETELY DRY before re-connecting. The inside of the Prodrive Silicone hose on the back of the intercooler was FILTHY! It was lined with oil - from...you guessed it, the engine vents, hence the reason to get some oil catch tanks! I gave this a good clean out with degreasent and petrol. I wouldnt recommend using degreasent in the intercooler btw!

As you will see from the photo I removed 2 pipes and the T peice. Using the bought 19mm elbow I routed the new heater hose off to the right. The inlet ports on the catch tank are 15mm so I had to use an inline reducer and a trimmed bit of the original PCV Valve hose to connect it all together - diagram...



The second vent port is the single metal pipe mounted on the top / front of the intercooler to the far left. You will see two hose pipes coming up on both sides of the intercooler from the heads into a metal pipe that then combines into one pipe which by factory setup connects into the intake pipe. Setting up this catch tank re-routing is easy compared to the crankcase. Route a peice of hose from this metal pipe into the oil catch tank and a second peice from the catch tank into the intake connection. I used a 15mm elbow to get the angle right and a small trimmed length of the factory hose as the elbow is too short to reach the intake pipe and have enough height to reach over the other engine parts to easily secure the heater hose to it.

This may all seem very confusing to read, but hopefully the photos make it easier to understand. Until you have a good look at your engine bay and remove the intercooler for the crankcase vent you will find the vents easily.

As for mounting the Catch Cans I put them in the battery tray with my smaller battery at the front right. You will have to find a suitable place to mount your tanks if this isnt possible and remember to keep bends and inclines in the hoses to a minimum.

Hope this helps, I will update if I remember anything else. Questions welcome.

Cheers, M.

 

Great guide mate....

How different would fitting be in a Classic?

 

Im not sure, have a search on this forum, there are a couple guides (I think there is one where the catch tank is fitted to a Classic P1) That would give you a fair idea where to fit it all together. Try Nasioc also.

 

good write up ,hopefully the mods with make it a sticky in the technical topics archive section.great pics