fabbing up an auxiliary crankcase vent setup using a second vent hose from the cam cover worked...on the first motor I did it on.
It worked very well [and still works over 100,000 miles later]. And such a setup also works very well on some high mile NA motors that needed some extra venting of the crankcase due to increased blowby getting past the rings-with-lotsa-miles-on-them.
On the Streak, also a B21FTi/M46, there would be some oil seepage/wetness around the oil filler cap and around the front cover and lower front cover, after a run was done to 'blow out the carbon'...if you catch the drift.
This was evidence of the stock PCV system not being up to handling the added volume of crankcase vapors --blowby-- generated during a sustained high speed, high boost jaunt. So I decided to install the same type of auxiliary vent setup on the Streak.
I installed the extra brass elbow on the intake pipe, installed the elbow fitting on the cam cover, and ran the second hose from the cam cover to the intake pipe.
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[And as it turned out, it was BECAUSE I had ONLY done those things is "why" the Streak started having an oil consumption problem.]
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It worked...as far as stopping the seepage/wetness around the oil cap and covers. BUT, the motor was using motor oil now. There weren't any drips or spots on the concrete; but the oil level would go down on the dipstick. To the tune of about a half pint a week. Oil consumption had NOT been a problem; even during the fun runs.
This was rather perplexing. It was obvious that the oil consumption was a result of what I had done. Determining the "why" of that took a while to figure out. In the meantime, I removed the auxiliary vent setup.
While the Streak was in for some other things to be done, I planned on solving the riddle of the sudden onset of oil consumption with the auxiliary vent setup. AND, I figured out how to do a catch can setup that would look very nice and neat, and look much better than a brass elbow on the cam cover.
The first order was to figure out the "why" of the oil consumption problem with the auxiliary vent setup.
