[DML] Re: Turbo question

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

Actuallly on many installations (not Deloreans) you put a loop (a
trap) in the drain hose so the bearings stay flooded in oil. On some
installations there is a check valve (drain-back valve) in the
pressure line so it stays full of oil. Most oil filters are supposed
to have one also which makes it always important to use the "correct"
oil filter because in many cases even though a filter fits it may not
have a valve or it may not be calibrated to work correctly on every
engine it is cross-referenced to. It is hard to do on a Delorean
because the filter is sideways but on many cars you are supposed to
fill the oil filter up with oil before you put it on so the motor
doesn't have to wait for oil when you first start it up after changing
the filter. Many manufacturers claim most of the wear on the engine
occurs during the first seconds of start-up before the oil pump can
get the oil into the bearings and create the thin film for the parts
to ride on instead of the metal bearings themslves. On the person that
never cools the engine down, the best advice is still to let the motor
idle before shutting off, even though you got 11 years out of it maybe
you can get 12 or more if you take better care of it. Cooling the
motor down by idling for a short time is good advice even on a motor
that doesn't have forced induction. Frequent oil changes also make a
BIG difference so maybe that is why you are getting such good service
from your turbo.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "Donald L. Ekhoff" <ekhoff@xxxx> wrote:
> My DeLorean tends to start quickly and with gusto. This means that the 
> turbo is expected to spin prior to engine oil pressure having a chance 
> to develope and transfer out to the turbo. There isn't really much that 
> can be done about it except to make things as short coupled to the 
> source as possible. Filtration could definitly introduce delay.
> 
> One good policy however is to provide a droop in the pressure line near 
> the turbo. When the line drains at engine shutdown hopefully this 
> depression can provide an immediate burst of oil to get the turbo thru 
> until the main supply is up and flowing. Try to plumb it such that this 
> supply line does not drain when the engine is not running. Prolon oil 
> additive is also an excellent product to help extend the bushing
life of 
> turbochargers.
> 
> Don Ekhoff
> 
> B BENSON wrote:
> 
> >>Something that I've noticed with every single turbo >set up that I've
> >>seen installed is dirty oil being used to lube the >turbines. Weather
> >>it's a "T" inline from the oil pressure sending unit, or a >pickup
> >>line pulling oil directly from the sump. Why? If you >want to prolong
> >>the life of the turbos, retrofit your car to supply >CLEAN oil to the
> >>turbos.
> >>
> >>-Robert
> >>vin 6585 "X"
> >>    
> >>
> >
> >
> >
> >Where else do you think you'd get oil from? The types of turbos
used in the
> >kit's that were offered for DeLoreans are the type that float the
impeller
> >shaft in oil which is flowing through holes in the bushing
surrounding the
> >shaft. The life of that bushing can be measured in seconds if not
> >milliseconds if oil flow is inadequate or disrupted when under
boost. Trying
> >to install filtering up stream of the turbo or trying to design a
separate
> >source for the oil shouldn't even be considered as a part of the
system.
> >
> >Bruce Benson
> >
> >
> >
> >
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> >
> > 
> >  
> >




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