legacycentral bbs

I will try to: print it out , touch it up and re-scan it. That's about the
best i can do..........
Rod... in Oz
----- Original Message -----
From: <daniel.wilson@db.co.nz>
To: <BC-BFLegacyWorks@yahoogroups.com>
Sent: Friday, August 03, 2001 6:19 AM
Subject: [BC-BFLegacyWorks] Re: ? box between intake and turbo


> Rod have you got a better picture of that so I can OCR it?
>
> Dan
>
> --- In BC-BFLegacyWorks@y..., "Rod" <melrod@o...> wrote:
> > Hi group,
> > Purpose of this : to stop oily, blow-by gases getting into the air
> inlet. (digrams attached) -[updated since last time..}
> >
> > General Description:
> > 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.
> > 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 alternative.
> > Mods:.....
> > 1. The hoses from the both the rocker covers come together as one
> and
> > lead to the air inlet duct. (see 'A' in dia). 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 gases 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 'B' in 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.
> > Realize though, that this is not legal under emission control
> laws but the
> > only thing that can be visually seen is the tiny foam air filter.
> Can be put back to std in 'blink of the eye', or could be hidden with
> a bit of imagination.
> > This should also make a difference to the airflow meter readings -
> it 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.
> > 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 quite a while.
> > Regards, Rod
> >
> >
> > Emission control Mods
>
>
>
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>
>
>
>
>
>


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