BJ8s, of course, have the wonderful 'log' intake manifold. I ran my PCV valve
to the pre-existing, plugged port that
was probably used for a vacuum gauge on other cars that used the same manifold
(?). Anyway, the servo hose and the PCV
valve go to the same place, no different than what you are suggesting, and I
haven't had any servo issues in (at least)
30K miles. Since both the servo and the PCV circuits are both more-or-less
under constant vacuum I don't see much risk
of the crankcase gasses being back-routed to the servo. Also, pretty much
every American car sold since, oh, 1970 or
earlier has pretty much the same setup, with the PCV and brake servo getting
vacuum from the manifold.
OTOH, some vehicles, like my Ford Ranger, are known for developing sticky
throttles from 'carbon' buildup in the
manifold, likely due to the PCV valve dumping into the manifold. That's
certainly possible with a PCV valve in a
Healey, but I'll deal with it if and when it happens (carb/choke cleaner did
the trick for my Ranger).
Can't help on the plug. If it's hollow, you may be able to drill a hole in the
center and 'collapse' the threads into it.
Bob
On 1/31/2012 10:43 PM, Simon Lachlan wrote:
> Following on from my recent PCV query......
>
> My 3000 is a MkII BT7, a Tricarb in fact. It's 3 inlet manifolds are linked
> by a tube called, I think, a "balance pipe". My car is one of a few Mk II
> BT7s which has a factory fitted servo; this servo gets its vacuum via a tube
> which goes into the "balance pipe" which is relevant because:-
>
> As yet I still cannot get the plug out of the front inlet manifold despite a
> lot of penetrating oil and heavy action with an impact driver. Is there any
> reason why I shouldn't vent my PCV into the balance pipe? Or will the oily
> gases find their way into the servo and gradually wreck it?
>
> Regarding the plug, that round screw headed item in the front inlet, is it
> solid all the way from the top down? Or is most of it hollow? It looks
> likely that I'll have to drill and tap it out and I wonder just much
> drilling is involved....
>
> Thanks,
>
> Simon
> _______________________________________________
>
>
>
--
*******************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
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