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Old 08-02-2019, 12:54 PM   #11
syjos
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City: Gig Harbor
Vessel Name: Sandpiper
Vessel Model: Bluewater 40 Pilothouse Trawler
Join Date: Nov 2012
Posts: 2,315
Quote:
Originally Posted by jleonard View Post
I made one for my previous boat from a 4 inch PVC pipe. Engine vent hose went in one fitting, yuck collected in the bottom in a piece of oil diaper, vented out the second fitting.
Sat against a stringer in the ER.
Great idea using PVC pipe.

I experimented with various materials and configuration for a catch can on my car engine.

Metal cans dissapate the heat better, which helps the hot crankcase vapor coalesce quicker.

Tall vertical cans work better because it forces the vapor to travel further through the brass wool.

On my paint thinner can, one of the ports (inlet) is long enough to be within 1 inch from the bottom of the can and has a 90 degree bend at the bottom.. The vapor is blown against the can side which will produce more oil droplets.

The outlet port is short at the top of the can which forces the crankcase gas to travel up through the brass wool, coalescing additional vapor.

If additional coalescing is desired, a finned tube between the valve cover and can will cool the vapor significantly.
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