-JC- wrote:When I replaced the vacuum hoses I bypassed the PCV valve, but I left the standard crankcase breather into the manifold in place. Reading something the other day made me realise this is probably a bad idea - the breather is no-longer vacuum controlled, so I'm guessing this means that it's either venting fully open, or fully closed? So what's best to fix? Leave the PCV disconnected and fit a K&N style filter and run the pipe separately? Or re-fit the PCV withe ither the existing system or K&N type system?
(and vice versa I assume)Burton Power wrote:With increasing environmental pressures Positive Crankcase was introduced whereby crankcase vapours were drawn up into the inlet manifold and, along with the air/fuel mixture, burned up in the combustion chambers. To enable this system to work safely and efficiently the ventilation from the crancase is controlled via a PCV valve. To avoid upsetting the fuel/air mixture the PCV valve must regulate the evacuation of these blow by gases and vapours (which will be minimal at idling speed but will intensify as engine speed increases) Since manifold vacuum is highest at low engine speeds the PCV plunger will be drawn forward to a position that will restrict crankcase ventilation to a minimum.....
-JC- wrote:So the catch tank feeds back to the engine via the filler cap? Or am I getting the wrong end of the stick?
Supercharged Nat wrote:I think your getting the small vacuum pipes on the carb/ inlet manifold confused with the crank case breather. maybe put up a couple of photos so its a bit clearer?
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