Paul wrote:

A jump from 30 inches of Hg to  32 inches of Hg is a 13% increase
in RPM and stress at the same altitude. On top of that the engine is

generating

roughly 6% more HP and  heat so the temp goes from say 1600 F to 1690 F

roughly

which further reduces the max allowable stress on the turbine wheel.

Mark Wrathall wrote:

Mark wrote:
You made a mistake here Paul, the increased power in not necessarily linked
to an increase in temp. There will be an increase in exhaust energy (more
mass flow at the same temp). The EGT is more a function of fuel air ratio
and combustion efficiency than of power level.

Regards,
Mark Wrathall

That is true but like everything else connected with turbos it might not be that
simple. Some heat from the turbine is conducted away through the shaft so if more
HP is going out the exhaust the metal temp of the blades as opposed to the
temp of the gas heating them may increase. Perhaps not 13%.

Paul Lamar
 
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