Crankcase Fumes Catch Can

thingiverse

I was looking for an affordable diesel powered vehicle crankcase ventilation catch can, but commercial ones were too pricey and came with replaceable filters. I also noticed that Thingiverse designs didn't utilize much internal surface area to maximize oil droplet capture. So, I created this device using Cubify Invent to print on a 3D printer. This design features an internal baffle network made from the plastic itself instead of a filter. With so much surface area inside for oil droplets to condense and being made from ABS plastic, there's no need for a replaceable filter element. The inlet nipple closest to the can opening is connected to the crankcase vent line, while the outlet nipple below it is connected to the air box. This setup allows for a clean, non-oil soaked intake tract. The small nipple on the bottom of the can should be connected to a small hose and capped off - this is the oil collection and drain hose. Check it periodically and drain off oil as needed. Note: This print job will take 5-7 days with a regular FDM printer due to the many internal vertical baffle elements. While they may seem excessive, these elements are necessary for efficient crankcase blow-by gas separation. The cap surface is designed to use a 124mm x 3.5mm O-ring, but it might seal well enough without one.