Yea that's true Errol. I don't think there is enough fuel vapour to cause
any problems, but pull the breather of our GTiR on boost and have a sniff -
it's quite fuel smellish :) Could also be some mixture leakage through the
valve stem seals into the rocker cover on positive manifold pressure.
I like to use a small bottle stuffed with stainless scouring pads in the
breather line to catch (de-oil) the breather fumes before burning or venting
them.
Another method which is used on my Datto is to use a remote oil filter
mount. Run the breather hose to the oil filter lines. Screw on a filter
which catches all the oil from the vapours before exiting under the car.
Also I think your way would work well too, and the partial vacuum achieved
would help to reduce oil drawn into the cylinder on intake stroke.
Cheers,
+--------------------------------------------------------+
| Chris Howard | Email: [EMAIL PROTECTED] |
| '69 Datsun 510 | Web: http://turbovan.com/ |
| '80 Escort Van SR20DET | Work: http://wattlesoft.com/ |
+--------------------------------------------------------+
| Forced induction - 'The replacement for displacement.' |
+--------------------------------------------------------+
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Errol Smith
> Sent: Thursday, 1 March 2001 7:06 AM
> To: [EMAIL PROTECTED]
> Subject: RE: Ozdat Update.... Datsun Sunny FJ20DET Race Car...Oil
> breather.
>
>
> Chris,
> I have used these on naturally aspirated engines without any
> problems I dont
> see why a turbo engine would be any different. If a turbo engine had that
> much blow by, It would follow that as well as unburnt gases it would have
> blow by gases during power stroke filling the sump cavity as well.
> Cheers
> Feral Errol
> mailto:[EMAIL PROTECTED]
> http://www.datrats.com.au/
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of uniken
> Sent: Wednesday, February 28, 2001 11:57 PM
> To: [EMAIL PROTECTED]
> Subject: RE: Ozdat Update.... Datsun Sunny FJ20DET Race Car...Oil
> breather.
>
>
> It depends how much piston ring blow-by your engine has. Turbo engine
> crankcase vapours can be quite fuelly.
>
> Cheers,
>
> Chris
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Errol Smith
> > Sent: Wednesday, 28 February 2001 8:22 PM
> > To: [EMAIL PROTECTED]
> > Subject: RE: Ozdat Update.... Datsun Sunny FJ20DET Race Car...Oil
> > breather.
> >
> >
> > No, Its only oil mist gases not volatiles from the cylinders.
> > Cheers
> > Feral Errol
> > mailto:[EMAIL PROTECTED]
> > http://www.datrats.com.au/
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of
> Andrew Greenbury
> > Sent: Wednesday, February 28, 2001 5:42 PM
> > To: [EMAIL PROTECTED]
> > Subject: RE: Ozdat Update.... Datsun Sunny FJ20DET Race Car...Oil
> > breather.
> >
> >
> > errol
> >
> > with this setup can there be problems with (for instance) unburnt
> > gases entering the exhaust on overrun etc??
> >
> > andrew
> >
> >
> > > Tom Linc etc,
> > > One thing you can do is use an extractor eductor for the
> crankcase fumes
> > so
> > > they go straight into the exhaust using a 15 degree angled
> fitting into
> > the
> > > exhaust. These are common on race cars to lower crankcase
> > pressure and get
> > > rid of fumes.
> > >
> > > Cheers
> > > Feral Errol
> > > mailto:[EMAIL PROTECTED]
> > > http://www.datrats.com.au/
> > >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED]]On Behalf Of Tom
> Richardson
> > > Sent: Wednesday, February 28, 2001 11:18 AM
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: Ozdat Update.... Datsun Sunny FJ20DET Race Car...Oil
> > breather.
> > >
> > >
> > > Linc,
> > >
> > > I haven't been busted for this and although it is illegal I
> > don't know of
> > > many older cars that actually have a recirculating breather for the
> > > crankcase vapours.... most people that I know who have
> sorted something
> > > like this out do it because it can make the underside of the car a bit
> > > messy!
> > >
> > > Also oil splashing onto the exhaust manifold and burning is a little
> > > disconcerting- I had this happen in my car and it's not
> pleasant to see
> > > smoke wafting up from under the bonnet all of a sudden he he he
> > >
> > > But you are right it should be done since it's illegal otherwise :) I
> > have
> > > only seen one place selling the tiny little filters you can
> > stick onto the
> > > breather- and that was Mildren Race Engineering here in
> > Adelaide- a rotary
> > > shop- go figure!
> > >
> > > - Tom
> > >
> > > ----- Original Message -----
> > > From: "Lincoln Yeo" <[EMAIL PROTECTED]>
> > > To: <[EMAIL PROTECTED]>
> > > Sent: Wednesday, February 28, 2001 11:10 AM
> > > Subject: RE: Ozdat Update.... Datsun Sunny FJ20DET Race Car...Oil
> > breather.
> > >
> > >
> > > > The hose from the rockercover is a way of collecting oil fumes -
> > > > they either go back into the carbie and are reburnt (along with
> > > > a bit of oil sometimes), or some people use a trap, which
> > > > catches oil and still allows the hose to breathe fitered air.
> > > > Obviously with some setups and or filters, it is impractical to
> > > > run the rocker hose or crank hose into them, so a filtered oil
> > > > trap is the go. Erol showed me a design that is simple and
> > > > useful.
> > > > Linc.
> > > > ps authorities like to see a filter on these hoses - and they
> > > > dont like them running out the bottom onto the road, so ive
> > been told...
> > > >
> >
>
>
>
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