VNT turbo - slightly O/T
Turbo Mini Forums

Slightly O/T as it's from my TDCi Mondeo.

But if anyone is interested, this is how they work (and fail) :)

Personally I would prefer to call them IGV (variable Inlet Guide Vanes) as that is what I'm used to calling this design at work for much larger machines, but the principle is the same.

The turnine inlet has variable nozzles to alter the flow angle, so control effeciency/performance at different flows.

Crap first picture from tonight



You can only (just) see tha actuator arms in this photo, I'll pull it apart properly tommorow so you can see the full guide vane setup.

I was surprised at how many guide vanes there are, I was expecting a lot less on such a small turbine.

In this case the shaft has clearly failed :)

The guide vanes seem to be siezed so I expect the shaft failure was due to overspeed.

Schrödinger's cat - so which one am I ???

VNT's are great!

Not too fiddley either. Even I managed to pull one apart, clock it and reassemble it.

In the 13's at last!.. Just