oil catch can /emmission mods

[Rod]

try this idea i used. Costs next to nothing and works beautifuly.......

Purpose of this : to stop oily, blow-by gases getting into the air
> let.
> -General Description (diagram attached) of workings, normally.....
>
> At part or nil throttle, the blow-by gas in the crankcase is drawn
> into the inlet manifold through the connecting hoses and PCV valve by
> strong vacuum in the inlet manifold (strong vacuum opens the PCV
> valve). Under these conditions, fresh air is introduced into both the
> rocker covers via the air inlet duct and connecting hoses. The
> crankcase (blow-by)gases, mixed with the fresh air, are drawn through
> the hoses, PCV valve and into the inlet manifold.
> At open throttle, under turbo boost, positive pressure is created in
> the inlet MANIFOLD ,ie. the inlet MANIFOLD has no vacuum and hence
> the PCV valve is shut. Instead, the turbocharger asking for maximum
> air, is creating a kind of vacuum in the air inlet ducting.
> Under these conditions the system works in reverse. Blow-by gases are
> drawn into the air intake duct via the rocker cover hoses and hose
> off the crankcase, prior to the PCV valve (shown in diagram below).
> During these conditions, the inlet air being fed is not 100% fresh
> air but a mixture of fresh air and blow-by gases. This also leaves an
> oily film, over time, in the inlet ducting, turbo and intercooler.
> 100% fresh air would be a better alternitive.

> What I did.....
> 1. The hoses from the both the rocker covers come together as one and
> lead to the air inlet duct. I have pulled this hose out and plugged
> the hole in the air inlet duct. On the end of the pulled out hose, I
> have fitted an oil foamed filter, a mini version of a uni-fliter if
> you like. Now the system can draw fresh air into the rocker covers
> whenever required but will not allow blow-by gaes to be drawn into
> the air inlet duct. It now 'breathes'. This is similar to the pre-
> emission days when engines used to 'breathe' through the rocker cover
> oil filler cap.
> 2. There is another hose that links from the air inlet duct, to the
> crankcase hose and PCV valve. (see diagram) I have plugged the
> section leading from the air inlet duct. This now allows crankcase
> vapours to be drawn in the inlet MANIFOLD via the PCV valve but stops
> the crankcase vapours being drawn into the air inlet DUCTING. This is
> now 'one-way' if you like.
> I realize this is not allowed under emission control laws, in Aust, but the
> only thing that can be visually seen is the tiny foam air filter.
> This must make a difference as the airflow meter now has the exact
> amount of air entering the engine, as is couldn't know what was being
> drawn in through the blow-by hoses. Physically I noticed that the
> chrome tailpipes on the rear muffler are not 'sooting' up as much..
> I also removed the air ducting / intercooler and cleaned the oily
> film off everything and it is still spotless. I have been running
> like this now for over a year.
> > Regards, Rod... in OZ






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