Good question. The way I see it...
...you need some kind of crankcase venting, so rule out blocking off the
breather tube.
...you probably don't want it connected to a constantly varying vacuum,
either, so don't just run it directly to the manifold port.
In your situation, I would be inclined to acquire the original style PCV
valve and use that. At least you could be assured that the configuration
works and doesn't cause problems down the line. A used one would be OK since
you can replace the rubber diaphragm.
This also has the advantage of being "correct".
My 2"...
on 7/24/01 3:42 PM, David Councill at dcouncil@imt.net wrote:
> I'm in the final phases of a carb conversion. Not a standard one and that
> is where the problem lies.
>
> The car is a 65 MGB with an 18V engine (from a 72 but the number indicates
> a later block). We are switching the HIF carbs (also from a 72) with the
> HS4 carbs that probably were originally with the 65.
>
> The problem is with the crankcase breather if I'm using the correct term.
> On the 70s models, this tube has a Y-splitter that splits the one tube into
> two which connect to ports on the sides of the SU carbs. The older SU carbs
> do not have these ports. Instead, the tube connects to the PCV valve that
> goes into the intake manifold.
>
> I'm inclined to plug this tube off. Can I do this? Or do I need a vacuum on
> the line?
>
> In short, any one else encounter this problem and if so, how did you handle
> it?
>
> David
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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