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Oil Catch Can

WHY DOES MY TURBO CAR NEED AN OIL CATCH CAN? WHAT’S A CATCH CAN DO?

Why do you install an oil catch can? Well, if you have a turbo car, especially a later-than-2004 model – there are quite a few very good reasons why it’s something you should consider.

If your car’s naturally aspirated, it’s not as much of an issue – so we’re going to be focusing on turbo cars here – like the Veloster Turbo , the BMW 335i/435i/135i/535i / BMW-anything-35i really, the N20, N26, N54/N55, S55 are all affected, as are Ford’s EcoBoost series of engines, in the Focus ST, Fiesta ST and Mustang EcoBoost, these are all Direct Injection Turbocharged engines, and other TurboCharged engines of VW, Mercedes, AUDI and all other popular turbo charged cars,   and as such they’re afflicted by all the same issues.

As we explained in our article talking about why BMW recommends Walnut Media Blasting Intake Valve cleaning Service be done every 40,000 miles (which isn’t covered under your maintenance plan BTW) – all turbocharged cars experience oil blowby when under boost. It’s just the fact of the matter – even brand new, your turbo car’s going to have oil blowby if you’re heavy on the throttle.

 

Find any Oil Catch Can from Aliexpress or AMAZON and search for your typical type, the Mechanic will probably do a custom fit with host & pipes to tailor to your car for you at their workshop..  

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See below are the Oil Catch Can installed in one of the Veloster Turb Charged Car.  

 

BEFORE  INSTALLATION                                                                 AFTER INSTALLATION WITH PIPING 

SEND US YOUR ENQUIRY TO ARRANGE FOR AN APPOINTMENT WITH A CERTIFIED EXPERT MECHANIC TO INSTALL:

 

Okay, so what’s oil blowby? Why is oil blowby bad?

engine-without-oil-catch-can

Blow-by is caused when a combustion in the engine forces fuel, air, and moisture past the piston rings and into the crankcase. From there, the blow-by is released by the crank case vents and back into the intake pipe. This occurs on all engines, but is worse on turbo engines due to the stronger combustion. This is bad because if nothing is done, this excess “gunk” will build up in the intake manifold, coat the intake valves, coldside of the turbo, intercooler, and intercooler chargepipes.

turbo_schematic

turboblowby

Check out the above illustration of how the average turbocharged motor is laid out along with a diagram of the PCV flow of a turbocharged car. So the PCV valve allows these oil blow by vapors to enter the intake tract.

As we said in the N54 walnut blasting article, the fact that many turbocharged engines nowadays are direct injected – which causes the inside of the intake to get much dirtier than it did on older multipoint fuel injection systems that sprayed the fuel mist into the intake manifold, spraying down the intake runners and intake valves with a mist of gasoline, which used to keep the intake clean. Since Direct Injection style fuel injection moves the injector directly into the combustion chamber, there’s no spray of fuel on the intake valves to keep them clean, so crap accumulates on them.

walnut-blasting-n54-nick-pics-3 walnut-blasting-n54-nick-pics-10Actual BMW N54 Intake Valve – look at all the crap coating the intake valve shaft, and the “ring”of crud that’s accumulated there from the movement of the intake valve.

walnut-blasting-n54-nick-pics-7Check out the yellowish green coloration to the intake area – that’s all oil. For reference for how it SHOULD look, scope out the before/after of an N54 engine that we did the Walnut Media Blasting Service for BMW N54/N55 on.

walnut-blasting-before-after

As the oil vapor collects on the walls of your intake manifold and intake valves and collects, it traps dirt and other fine particulates creating an icky sludge coating. The way the crud builds up on the insides of your intake is a lot like how your arteries can become clogged with bad cholesterol if you have a poor diet.

Much like clogged arteries will cause your body to perform badly, intake valves coated with blow-by and carbon buildup can cause the intake valves to stick or not seal as well, can negatively affect VANOS / VVTI type systems, lowers the effective octane of your fuel and generally makes performance suck – and the problem is exacerbated by higher boost levels.

engine-with-oil-catch-canSo, besides doing your Walnut Media Blasting every 40k or so (20k or so if you’re tuned) – what can you do to keep your motor clean and do your part for preventive maintenance? That’s where the Oil Catch Can comes in.

WITH OIL CATCH CAN INSTALLED – FLOW 

BEFORE INSTALLING YOUR OIL CATCH CAN – FLOW

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