forgive my ignorance but i have noticed that some people have oil breathers on the back end of their rocker covers instead of the hose from the air cleaner. apart from looking good is there any benifits from doing this? the hose on my daily project is stuffed and i was wondering weather to get a new hose or get an oil breather???

Mini Pod Filter vents oil mist to atmosphere instead of the oil mist going into air cleaner assy and being sucked into the engine and being burnt.

Mini pud technically not legal as you have altered emission control system. But it looks cool

yes i agree it looks cool butis there any benifit or should i just get another hose for the environments sake?

No real benefit in running a little filter, I guess if it were quite smokey and you cycled the fumes you'd lose performance somewhat. But if you fitted that little filter onto a smokey engine you'd notice the smoke straight off (those filters don't catch much).

The blow-by on my motor was so much that when I plumbed the fumes back through I lost a lot of power.

So I guess if the fumes aren't too bad you might as well plumb it back through and save (somewhat) the effect on the environment. And if the fumes are bad, then a rebuild/recondition is on the cards.

sweet as its settle... new hose, lol i love the environment.

Lets get this one right.

Ther PCV system draws crankcase fumes from the cylinder block via the pipe at the back of the block on the manifold side.
These fumes are drawn [sucked] into the high vacuum of the inlet manifold via the PCV valve which ascts as a sort of regulator that controls just how much air [fumes] is flowing into the manifold so as to not screw up the fuel mixture.

The air that is sucked from the crankcase is replaced by nice clean filtered air that flows from the filtered-air side of the air filter assembly, through the tube to the top/rear of the rocker cover & then down into the lower crankcase & eventually on into the inlet manifold.

If the engine is worn & the volume of blowby gas in the crankcase is more than the PCV valve can handle, the excess gas travels up into the rocker cover, along the hose at the back & into the carby side of the air filter where it is sucked into the carb, then [obviously] into the cylinders to be burned in the combustion process.

In an engine that is in good condition the pod filter will pass relatively clean air into the crankcase as per the original setup but because of its size, will very likely block up in a relatively short time.

If the engine is worn, the backflow will pump crankcase gasses into the engine bay & the oil mist will clog the filtering medium pretty quick.

The factory system is by far the most efficient, practical & effective method of solving the crankcase ventilation problem.

Damn clever those Datsun engineers. Much more clever than most of us.

oil that mixes with fuel lowers it's octane level. So that's why you see the two systems modified.
A lot of people do it, but few honestly no why they did it other than " I saw someone else do it"
Not done right on some motors can put positive pressure in your crankcase- and that bad mmmkay.

This is true, however an engine in good condition will have good compression & very little blowby so oil mist contamination in the inlet manifold will be, essentially, zip.
This engine will require fuel with an octane rating commensurate with the compression ratio/pressure that is present.

An engine in poor condition will have low compression & quite a bit of blowby which in turn will push a lot more oil mist into the PCV system. This additional oil will contaminate the fuel charge & reduce the octane rating of the fuel, however the low compression pressure will pretty much negate the effects of the reduced octane rating & detonation resulting from a low octane fuel charge will not be a likely outcome in the vast majority of cases.