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Thread: Tri-carb PCV valve

Forum to discuss Austin Healey Sports Cars

  1. #61
    Yoda steveg's Avatar
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    Re: Tri-carb PCV valve

    Quote Originally Posted by Bob_Spidell View Post
    Best install I've seen yet. Did you fab the balance pipe w/PCV line, or did it come with the DMD?
    Thank you! Using a Harbor Freight tube bender, I bent it up from 3/8" fuel/brake line steel tubing and did a mediocre job silver-brazing the joint, filling it in with steel epoxy and filing that to look nice. The bracket was sliced off a piece of lightweight aluminum angle. The PCV was scientifically picked by going to the auto parts store and looking for one from a medium-horsepower car that would fit 5/8" in & 3/8" out.

    The DMD came with the brass barb fittings and the balance pipe was 3/8" rubber fuel tubing.
    Steve Gerow
    Altadena, CA, USA
    Maker of most complete Big Healey rear disc kit
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  2. #62
    Yoda
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    Re: Tri-carb PCV valve

    Quote Originally Posted by steveg View Post
    Having reinstalled the PCV, with my Air Fuel Ratio and Exhaust Gas Temp gauges, can report it had no visible effect on either AF ratio or EG temp.
    Good to know, but not surprising. I believe the way PCVs work is to close off under high vacuum conditions--i.e. idle--and to open under low vacuum (WOT). The amount of the 'leak' is all but inconsequential, but enough to evacuate the crankcase. To think everybody thought they were the devil's spawn when they were introduced (now, air pumps are another story).

    Went to start the BJ8 today, and it barely started and wouldn't idle. Started going through the diagnostics flowchart when I noticed I'd neglected to reconnect the vacuum line to the brake servo after I adjusted the valves; now THAT'S a vacuum leak!

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