Vincentmiata

Im having an issue with to much crankcase pressure and im now designing a new catch can. I thinking of 3D printing with ABS plastics. What you think so far? I looked at the OEM valve cover design with the baffles and made something the same.



There will be a cover on top with 2 AN-12 hoses on the left. And on the right i was think of pulling vacuum from the inlet manifold and on the turbo inlet.

Schuyler

iTrader: (1)

ABS is amorphous right? Are you at all worried about it getting too hot and deforming?

Vincentmiata

Aren't all other plastics like OEM air filter housing ABS?


3D printer ABS filament says the melt temperature is 200 degrees celsius

Joe Perez

iTrader: (8)

But what's the temp at which it becomes plastic? Polymer materials often (not always) start to deform before they actually melt, and the working temp for printing the material (getting it hot enough to flow through a nozzle) is going to be a lot higher than the maximum temp it can sustain in use without starting to collapse.

patsmx5

iTrader: (16)

Look up how I made my catch can. Copy that design, it's fairly simple and very effective. It's the same design moroso uses, just bigger. Make one like that. The moroso design actually works.

Schuyler

iTrader: (1)

105C (221F) is the glass transition point of ABS. In school we were taught amorphous didn't really have a precise melting point like crystalline structures.

AlwaysBroken

ABS should be fine for a catch can unless it's pressed up against the engine. You're going to be plumbing this into the compressor inlet on one side and the crankcase vent on the other, right? Worst case scenario, wrap it in shiny insulation like the brake cylinder.

Vincentmiata

I was thinking about a plug in between the turbo and the air filter. That one is going to vacuum with right?

I already had a cheap catch can but still blowing smoke when of throttle.. I bought a transparent tube and used it as a turbo return line to see whats going on. And i saw that the oil cant get out fast enough. The first time starting up it filled for the half. And this tube is 6-8mm larger than the orginal return line i used. So the oil level is even higher.

18psi

iTrader: (76)

wait wut? you filled up an oil catch can halfway on 1st start?

Vincentmiata

No no, the oil return line filled up half way. Blowby is nothing more than normal. Oil consumption is almost nothing.

When i drive WOT and and going off throttle there is nothing, but when i the rpm is lowered to around 3000rpm it starts to smoke till around 2000rpm. After that its over.

asmasm

iTrader: (1)

As other have mentioned, ABS tg is about 200f not 200c. This might hold up if it is a really good quality print but I would expect most consumer level prints to fail evetually. Where is the oil going to go when that happens? Engine fire? Onto your tires?

Honestly, your design looks like it is well suited to being welded together from aluminum plate.

Shortpersonbk

Why not take all the thought out of this and just buy one of the best catch cans available on the market and solve the issue for good?

Like asmasm stated if it does melt or depending on your venting method if the design does not work it could end up all over your tires or engine bay which could lead to a situation costing a lot more then a simple $380 iag catch can or something.

asmasm

iTrader: (1)

Aside from melting, abs expands and contracts significantly in your heat range. I would be worried about it cracking.

dc2696

iTrader: (2)

I'd be so ******* pissed if some shitty plastic piece like that broke and dripped oil on my driveway, for concrete's sake just buy a good one!