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Re: [turbobike] pumping oil through the turbo

Dave Morrill (david.p.morrill@fairchildsemi.com)
Mon, 26 Apr 1999 13:30:12 -0400

    I'd like to follow up on Tim's comments, which I agree on fully, and I
bored at work today.  I added a pressure regulator in the oil feed line to my
turbo, my bike puts out over 70psi oil pressure, the turbo doesn't want to
see much more than 40 (I'm using an old T-2, newer turbos may be better).
Tried various restrictor ideas, like a slug with a small hole in it, but went
to a dead head type regulator because the hole I needed was so small I felt
it would get plugged.


Tim Drew wrote:

> George,
> I'm not fully conversant with the water cooled GSX-R11 motor but I think
> your going to run into serious problems with your suggested plumbing.
> 1) You say there is pressure in the oil cooler lines, but is this full
> engine oil pressure and is this pressure there all the time. For example
> is the oil cooler thermostatically controlled.
> 2) You say the oil pan is lower than the turbo, but if your mounting the
> turbo in the conventional position I'll bet you can't mount it high enough
> so as the discharge pipe is above the actual oil level. Bear in mind the
> oil level (without the engine running) is up to the sight glass in the
> clutch cover.
> 3) I don't know but I suspect if you supply the oil cooler directly from
> the oil gallery beneath the ignition cover without some sort of
> restriction in the pipe you may well find you significantly reduce the
> pressure to the bearings.
> ---
> You can return the oil from the oil cooler or turbo to virtually any where
> you like, a good and simple location could be a pipe fitting welded to
> your clutch cover just above the oil level sight glass. This is the
> location I used on my old draw-through system.
> I would suggest when you re-locate you oil cooler you plumb it to the
> existing pipe fittings. You can then take a pressure feed for the turbo
> from the oil gallery below the ignition cover using -4 hose. If you can
> genuinely mount the turbo above the oil level then all well and good the
> oil can gravity drain back to the oil pan, but if you can't you will have
> to find a way to scavenge the oil back. This can be done in a number of
> ways, Rick and Christer both use the engines own oil pump via a reed valve
> or venturi to create a mild suction, but I'm going to use an electric pump
> on my air/oil cooled GSX-R. If you find a better way please let me know.
> If you get chance get yourself a copy of Joe Haile's book 'Motorcycle
> Turbocharging, Supercharging & Nitrous Oxide'. This book doesn't give all
> the answers but will point you in the right direction and give you some
> idea of what can be achieved.
> Good luck with your project...
> Regards
> Tim Drew
> --
> mailto:timdrew@cix.co.uk
> > Hi Rick,I came up with an idea,since my motor (gsxr 1100wp '93) is
> > both water and oil cooled,I was thinking that I could remove the oil
> > cooler from it's present location in front of the oil filter and
> > reposition it
> >  to make room for the turbo.
> > At the same time I can use the oil lines that go to the oil cooler for
> > the turbo,(since there is pressure in those lines) I don't think the
> > turbo will flood with oil because the return line from the turbo goes
> > straight to the oil pan wich is located lower than the turbo,saving me
> > time and headaches!Now If i'm going to keep the oil cooler,I have to
> > get oil to it and back,not worying that  it will flood, I will take
> > oil from the oil gally under the ignition advancer, route it to the
> > cooler,and return it ????? Where would be a good spot to return the
> > oil from the cooler?Tell me what you think of this idea.
> > I hope you understand what i'm trying to say...
> > Thanks Rick!
> > always a big help!
> > if anyone else knows what to do,please send me your thoughts...
> >
> >
> >
> >
> >
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