Toronado.org

Hello, all ~
I could use some help figuring-out a strange occurrence.
We have a couple of long sweeping off-ramps here on I-5 in Seattle.
Whenever I come through those a bit hot, I leave a huge plume of smoke behind me. Some are right turns, some are left turns. Happens on both.
The motor doesn’t burn oil. Doesn’t smoke, never at start up nor while driving spirited.
It only happens on these sweeping curved ramps.
I can see a bit of an oil trace on the pass-side PCV-valve, which is an aftermarket one, but that’s it.

Might anyone have a theory what causes this condition …?

In your photo the PCV valve is on the driver's side. Are you talking about the air intake thing you have on the passenger side?

I'm wondering if the sudden decrease in engine speed has anything to do with it? oil getting past valve guides or seals?

Perhaps oil is being sucked into the carburetor through the pcv system. Is the valve the correct one? Maybe it's stuck.

Do you have the original fresh air cap for the passenger side? If so, put it back on and see if there is any change.