Thanks for the kind words people.
Everything you see is airbrushed (except ofcourse the red glowplug thingies). For ease of masking I had cut-off the air-inlets, which are normally molded in one piece with the rest of the engine, after airbrushing I glued them back.
For the frame I used semi-gloss black (Model Master) and I airbrushed it in misty layer, no wet wet layer.
Next thing I will do are the exhausts, they are already airbrushed, and ready to install, pics will follow later.