I run a 1970 Plymouth Duster with the never-say-die 225 as a daily driver. Last year about this time, I had the opportunity to do a piston ring job and rod bearing replacement, which it needed pretty badly. (I want to rebuild the whole engine, but money and time constraints are keeping me from that right now.) The ring job gave her back a lot of new life, compression and power and what not, which is good because she has to last me a while. My problem is that it still will foul out the air filter in a few days, through that troublesome crankcase breather cap (the bigger one, not the smaller PCV valve) that connects to the air cleaner.

As my Chilton manual shows it, air is supposed to flow through the breather cap, into the engine, then back to the carburetor through the PCV valve. But mine still wants to pull the reverse way, with the carburetor sucking oil mist and contaminants up through the breather cap to foul out the air filter. I know the PCV is also sucking properly, with great vacuum. But how is air ever supposed to flow the correct way, through the breather cap and into the engine, what with the huge source of vacuum that is the carburetor intake pulling in the opposite direction? There is no way that the small-diameter PCV hose could overcome the vacuum through the large-diameter breather cap and its hose.

Fortunately, the breather cap no longer smokes on its own, as it used to do pretty heavily with all the blowby getting past the pistons to pressurize the crankcase. Now, it is only the carburetor sucking the oil mist and such out of the valve cover through the breather cap. But as I say, I do not see how it could not do this, even with a perfectly-built engine that had zero blowby. And replacing the air filter every couple of days is not something I want to do. Should I just remove the hose between the breather cap and the air cleaner, and let the breather cap draw air on its own, since it is a filter in itself? This would have it sucking cold air on winter mornings, instead of hot air via the air cleaner's thermostatic setup, but I see no other alternative. Any advice would be helpful. Thanks!

--Palanth Dragon



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