MJones

From the 07/08 Porsche Annual Report:

The new generation of engines also spawned cutt-
ing edge quality assurance with significantly more
efficient monitoring procedures. This was a tech-
nical requirement on account of the direct fuel in-
jection of the new components, but at the same
time results in considerable advantages for the pro-
cess. The engines are no longer tested to their
limits in the “hot test” for extended periods of time
at high revs. Instead, they are put through a “cold
test” under low stress in which the quality datais
recorded. The number of data recorded is never-
theless significantly higher than in previous pro-
cedures and this data is systematically incorpo-
rated in the production process, leading to signi-
ficant improvements in quality assurance. In ad-
dition, selected engines are still subjected to a
“hot test” which is now even more intensive thanks
to the lower numbers.

bgiere

Well "hot testing" never caught any cylinder failures, IMS failures or RMS leaks. Let's see how the new engines do. I'd bet they are gonna be great.

Leader

The fact that Porsche still tests all its engines at all is remarkable.
The number of other manufacturers testing each engine is countable on one hand (while the hand holds a cell phone and car keys).