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Do I have a "D" turbo or a "C" turbo?

martin

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Newhaven UK
Hi
I had a whistler which was very loud so we just cut the stack so it went up vertically and popped a flap on it.
This reduced cab volume dramatically.
Martin
 

jimk

In Memorial
In Memorial
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48
Location
Syracuse, New York
The whistle may be caused but the turbine tips(or air vortices there) exceeding the speed of sound.

The C turbine has more angular compressor wheel.

The Mack I operate at work has a variable nozzle turbo. This has a ring of movable vanes in the housing (around the turbine) to contol output (turbine speed).The whistle changes as the servo motor does its thing.

Every turbo I have ever seen has whistled [under load]. The deuce has a lot of other noises coming from the engine. That may drown out the D. Mine M35A2 has a NAPA stack muffler and the turbo can occasionally be heard spooling up.

JimK
edited - got the photo's mixed up
 

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