Hello DoGGa, welcome to the forum
On a Wartsila 12V46 putting out about 10MW, the charge air press after cooler, was 2.71 bars and the temperature was 55 celsius. The "normal drop across the cooler was 15 - 30 mBar.
Here is some other info I found. "Max. Δp over the filter 15 mbar. 5 mbar elevation in differential pressure over the charge air filter causes approximately ~2 g/kWh increase for SFOC.
The engine tends to suffocate due to lack of scavenging air. Delayed combustion. Increased thermal load, worse fuel economy,.
Can be avoided by follow-up and adequate cleaning. Cleaning interval according to manual is 1000 h
The coolers are equipped with pressure drop indicator
Normal 15...30 mbar
at level 60 mbar clean the cooler
at level 80 mbar severe problems
Certified Marine Engineer and Webmaster
Martin's Marine Engineering Page