yeah i will get a breather asap , umm the coil is just one from super rice 40RT, just a better high volt coil, but i will proably umm grade to ellec dizzy with Bluey coil the head is a A12GX H72, but it has been rconed, ported and flowed so not sdtandard, the specs are :
Ports: - 39 x 31 mm biased Inlet, 31 x 28.5mm exhaust, Ports by Hiflow matched to GX gasket. flow benched.

umm yeah paint is heat resistant need to redo it as got chips from install , its a dihatsu red heheehe... but dont hold that againest me

hey no thermo???

lazy mate

and yeah i dont like the idea of pumping dirty air back through should run a super rice midget air cleaner thingy on that instead

want me to set you up with a bluey series 2 elec dizzy???

and how bout elec fuel pump, you should get one of those too

If your engine is in good shape (good rings), no oil will be pumped into the air filter. Think about it, that's how Nissan plumbed it -- to the air filter.

On the other hand, if you have a lot of blowby (worn rings), yep, oil will get into the air filter.

The ventilation system doesn't pump air from the crankcase through the air filter. Just the opposite happens: the PCV valve sucks a little air through the rocker cover vent at part throttle. Since not much air is flowing, it cannot "steal" air (cut down on airflow) from the filter, which is big enough to handle full throttle airflow. At full throttle, there is no vacuum, and so little to no air flows through the crankcase vent. By the way, the PCV system helps equalize pressure on both sides of the piston rings, further helping to control oil usage.

Using a separate filter will work just as well as plumbing it to the air filter. But there is no real reason to change the vent system unless race rules say otherwise, or your engine has loose rings (like many race cars. I think that's why racers use an oil separator).

DGONZ. Sorry to say this but the cranckcase vent works both ways, under heavy acceleration, it reverses, so it can suck air through the valve cover and also release air and oil off the valve cover into a Weber or into a breather, that is why, I think , it is better to have a breather filter.
The engine internals produce gases and noxious substances while the engine temperatures rise and the oil is splashed inside the block. The gases are trapped inside the block, and there are 2 ways out, at least , conventionally, the valve cover, and the block opening. The valve cover, everybody knows, is connected via hose to the air filter, or a breather filter (separate from the carb air filter). The second way out is the block opening, down below in the block, connected via a hose to the intake manifold. Between the intake manifold and the hose there is what is called the PCV valve(positive cranckcase ventilation valve), which allows air/blow by from the engine into the intake manifold, but does not allow the reverse to happen, intake mix out through the hose into the block. Normally (according to my Datsun 1976 book) at cruising speeds and decent acceleration, the flow is as it should be, the manifold vaccumm exerts enough force to inhale the gases coming out of the block via hose through PCV valve, and, if air leaves the motor, air must replace it too, so fresh air comes in through the valve cover hose, which could be hooked to the air filter or the small breather. At high acceleration, high RPM though, the flow reverses, because the manifold vaccumm is not strong enough to keep up with the amount of gases generated, so the valve cover hose begins puffinn out gases into the carburator air filter or the breather filter,( whichever on), only gases go out, there is no reversal at the pcv valve, so all the oily stuff( no roses and cologne come out, it is gases and oily stuff) goes out the valve cover. In extreme cases when the PCV hose is blocked by years of neglect,(or a clogged down PCV valve)...the blown gases will only find a way out, that will be the valve cover, which would be the one and only way out. On the worst cases, both PCV valve, hose, and valve cover hose are clogged down bad, all at the same time. In those conditions, the gases will always find a way out, this time, through your gaskets, timming chain cover, valve cover, oil pan, all become leakers, that is why some of the dirtiest engines leak like crazy, no maintenance. Well, so back to the small breather, I believe is good, better that allowing all that scumm to reach the carburator. The reason manufacturers hook it to the filter is in an effort to have this gases burnt in the combustion by being sucked into the carburator. Racing cars do not hook this hose to the carburator, unless some draconian regulation requieres strict stock configurations. Some cars have 2 breathers, for the block as well as the valve cover, but as Dgonz said on another occasion, for a street car with not that constant high RPM found in races like oval races, the PCV valve is needed, it circulates the air, you would need constant high RPM to need no PCV valve and just another breather in its place,but the valve cover to carburator hose is not good. All that oil will mess your carburator, make it dirty, blacken it, and the air comming in when working as an intake of fresh air will be cleaner and purer, and cooler than the air comming from the inside of the carburator air filter. This air is not good for your carb/intake, it has less oxigen, a lot of gases and hidrocarbons, it is better to keep it away from your intake manifold(if going into carburator), by connecting a small breather filter to the valve cover.
Jaime.

I'm sure that the caption should read "a few dirty bits need "TO BE" cleaned etc.

ddgonzal is 100% right, particularly when he writes "If your engine is in good shape [good rings] etc.

If you are making oil in the aircleaner, then FULLY service your PCV system. If this doesn't fix it, then a compression test will go a long way towards revealing the true cause.
The stock PCV system will handle all the output of an engine in good servicable condition. If it is worn enough to overcome the PCV system, then flogging the ring out of your engine won't make it any better.
Many of the gasses contained in crankcase output are combustable, so i guess that burning them by passing them into the manifold can only produce more power. No? Oh well, it was just a thought.

Heres the bottom line. If your street engine is pumping noticeable levels of crud into the aircleaner, look for the ACTUAL cause, because fitting a rocker cover breather isn't going to fix it. It just transfers the mess to the rocker cover.
Chris
P.S.
The engine in the photo is looking good. The hose to the aircleaner is a sign of a thinking man.