A Small Metal-working Project

[Deleted User 287]

Your thoughts ?

The engine may not be a reality for me, anyway. Moot point, now.

Maybe cram the frame full of batteries and convert the final drive to chain?

[vanzen]

The engine may not be a reality for me, anyway. Moot point, now.
Maybe cram the frame full of batteries and convert the final drive to chain?

OK, then ...
So ... How's about the viability
of the proposed theory to adapt the stock breather
with the objectives of keeping oil out of the intake, off of the tire, the MC,
And without distributing the residue into the air we breathe ?

[vanzen]

The old-school method to reduce oil blow-by into the intake / carb(s)
involved stuffing a small copper scouring pad into the oil condensing chamber.
(through the pipe-cover at the front of the block)
This pad acts as a "separator" by providing significant surface area to collect condensed oil,
leave it in the chamber, and without affecting crankcase pressure.
Oil that would otherwise be blown right into the intake ...

Cost ?
A package of 2 "Chore Boy" pure copper scrubbing pads,

@ $2.50 + time to install.

[mattcfish]

The old-school method to reduce oil blow-by into the intake / carb(s)
involved stuffing a small copper scouring pad into the oil condensing chamber.
(through the pipe-cover at the front of the block)
This pad acts as a "separator" by providing significant surface area to collect condensed oil,
leave it in the chamber, and without affecting crankcase pressure.
Oil that would otherwise be blown right into the intake ...

Cost ?
A package of 2 "Chore Boy" pure copper scrubbing pads,

@ $2.50 + time to install.

I used stainless in mine. I've thought about running it back into the carbs since just about zero oil is coming out the breather, mainly water in the catch reservoir. I've been told that any oil, even the oil that's supposed to be there robs power during combustion. Probably wouldn't be an issue with my new top end, put it would be more PC and the slight amount of vacuum from the carbs might actually help reduce resistance in the blow by chamber. During the damp cold winter months here in the NW, it's amazing how much water condenses into the oil.

[ME 109]

That's a good idea Vanzen, and strange that it wasn't done by BMW?
I'd imagine the service life of the scrubbing pad material in this situation would be considerable.

I shall do likewise next time my anlasserabdeckung is off.

[vanzen]

I'd imagine the service life of the scrubbing pad material in this situation would be considerable.

Recently removed a copper "scrubber" from a condensation chamber after @ 30,000k miles of service.
It was oily but unscathed.

[Chuey]

Then, the conclusion is that oil doesn't damage copper?

Chuey

[vanzen]

Then, the conclusion is that oil doesn't damage copper?

If one will be stuffing a pot scrubber into the engine's condensation chamber
I would strongly suggest a material that will not deteriorate, disintegrate,
or otherwise be adversely affected by oil, water, or heat.

Pure copper or stainless steel might be good choices ...

Copper clad plastic might not be a good choice due to the possibility of melting.
Plastic might not be a good choice due to the possibility of melting.
Steel wool might not be a good choice due to the possibility of rusting.
etc.

[MarkAZ]

When I got my 83 R100RS a few months ago it had a system for this. There was a hose connected to the breather hose in the air box that went out thru one of the holes for the PAS to a canister hung from the cross member. From the canister, another hose ran back up into the air box thru the hole in the back of the box to the tee to which the diffusers in the intake tubes were connected. So the flow was from the crankcase into the canister and then back into the air box as usual. The canister was made from what appeared to be an old freon can. It had a couple stubs of copper tubing soldered on to which the hoses connected. There was a nut soldered to the can with a small bolt in it, presumably for a drain. I was curious how much oil had collected so I removed it to find that the can had rusted thru and had several holes in it, not visible from above. There was no oil in it. Great...unfiltered air getting into the engine. I removed it all, plugged the holes in the air box, and put it back to stock. My feeling is that if it was needed, BMW woulda put it there.

Here's a pic of the air box interior:



The big hose coming toward the camera went to the canister, the small one on the right is coming back. The oil all over the inside is from an over-oiled K&N air filter which I replaced with the proper filter and then cleaned out the inside of the box. The opening the big hose went thru was not sealed...another source for un-filtered air.

And here's the canister installation:



I don't have a pic of the canister itself.

Just thought y'all might find it interesting...