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Old 06-26-2015, 03:24 PM   #1
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Default Any tips for my new design of catch can for 3D printing

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.



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Old 06-26-2015, 03:31 PM   #2
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ABS is amorphous right? Are you at all worried about it getting too hot and deforming?
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Old 06-26-2015, 03:33 PM   #3
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Aren't all other plastics like OEM air filter housing ABS?


3D printer ABS filament says the melt temperature is 200 degrees celsius
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Old 06-26-2015, 03:52 PM   #4
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Quote:
Originally Posted by Vincentmiata View Post
3D printer ABS filament says the melt temperature is 200 degrees celsius
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.
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Old 06-26-2015, 03:56 PM   #5
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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.
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Old 06-26-2015, 04:05 PM   #6
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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.
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.
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Old 06-26-2015, 04:14 PM   #7
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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.
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Old 06-26-2015, 04:24 PM   #8
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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.

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Old 06-26-2015, 04:37 PM   #9
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wait wut? you filled up an oil catch can halfway on 1st start?
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Old 06-26-2015, 04:46 PM   #10
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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.
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Old 06-30-2015, 09:04 AM   #11
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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.
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Old 07-05-2015, 05:26 PM   #12
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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.
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Old 07-05-2015, 06:13 PM   #13
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Aside from melting, abs expands and contracts significantly in your heat range. I would be worried about it cracking.
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Old 07-05-2015, 06:25 PM   #14
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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!
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