Thread: A new car!
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Unread 10-21-2018, 08:39 PM   #192
Workin' on it
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Default Fixing the catch can

Here's the new hose for the catch can. It's a 1" heater hose and runs to the catch can. The fitting there goes down to about 3/8" but it's a lot better than previously.

In the prior system there was a 3/8" hose running from the oil filler cap to the catch can so the fitting had a 1/4" ID. At the can there was another hose stuffed into the fitting and running to the bottom of the can. That should have helped with the separation, but was about 1/16" so tiny for the flow. This made the crankcase pressurize and blow oil out the dipstick and elsewhere.

The new system seems to be working. It's not possible to duplicate track conditions on the highway and especially in a metropolitan area. Still, running it to the red-line doesn't produce the obvious oil stains from it squirting out the dipstick and there's now dripping.

To help get the oil out of the blow-by, there's part of a stainless steel scrubbing pad stuck into the catch can end of the big hose. It's a good deal more coarse than steel wool and is like a bundle of machining scrap.

I've got another separator on order and may put that in plus, maybe, a small catch can with breather. Just need to see how to mount it.
Attached Images
File Type: jpg CatchCanHose.jpg (244.3 KB, 1 views)
1980 928S Euro
1987 944 N/A

Last edited by GlenL; 10-21-2018 at 09:13 PM..
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