Quote:
Originally Posted by Zeke3
I have never seen a breather system with that small of diameter tube. The gases are going to be moving pretty quick in that tube.
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Zeke....I believe you've asked a valid question, but you should remember that the PCV valve-vented system has engine vacuum helping to propel the noxious gasses, through a roughly 3/8" nipple on vacuum side of PCV valve. On a stock road draft set-up, the volume of gasses is only vacated by whatever suction the road draft tube has on it produced by air speed from vehicle going down the road. It's not like that stock road draft tube is pushing-out huge volumes at high pressure. That draft tube's large diameter is necessary to aerodynamically induce a vacuum as the tube moves through the air below car. You should also realize that PCV valves allow the MOST air evacuation at a LOW vacuum (like at wide-open throttle/acceleration)….when the MOST blow-by pressure is created. Likewise, the LEAST amount of air is allowed past the shuttle at HIGH vacuum (like during idle/steady cruise)….when the LEAST blow-by pressure is produced. This is likely the REVERSE of how most folks think these valves are designed to work. Check-out below! DD
