Re: [DMCForum] Re: Turbos

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

>
> There are the Island Twin Turbos, but while they're are powerful, it's
> a crappy desgin IMO. On that car, the turbo charges sit between the
> throttle plates, and the intake manifold. So let's say you're stomping
> on the engine hard, and the turbos are running boost. The air passages
> after the compressor are under pressure, which is normal. BUT, let's
> say you took your foot off the gas pedal. Now the turbo units are
> under Vacuum, which is not a good thing. The vacuum will break the
> seals on the turbo, and allow oil to slowly seep out. Which is why
> some turbo charged DeLoreans with the Island kit have black exhaust
> pipes. It's not any internal damage to the engine, just a problem with
> the seals breaking.


The BAE turbo does the same thing and I've got one in at the moment 
thats burning oil.

>
>
> With the Legend design, the throttle plates would close, and cut the
> vacuum off from the turbo units. So you didn't really have this
> problem. Many late modem VW TDI cars have this same problem. Except on
> their cars, they also have to contend with diesel exhaust, so their
> entire intake manifolds clog up. 

Eh, WHAT?! Number 1, diesel engines don't produce vacuum because Number 
2, they don't have throttle plates. Number 3 what difference does the 
type of fuel make to the intake manifold "clogging up"?! Diesels by 
their nature are all injection and TDI's are direct injection! The fuel 
goes into the cylinders and nowhere else! They're suited to turbos 
because of the much higher compression and associatedexhaust gas 
expansion after the combustion chamber. ALL petrol turbo engines blow 
through the throttle plates, and most have a dump valve (or blow-off 
valve as you guys call them).

Renault made 4 version sof the PRV turbo but apart from the basic block, 
everything was changed.

Martin

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