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sunny. thanks. i knew the offy was an old engine, but had not realised that it was dohc.
re headers, i lways took that as an americanisation. nothing in my old car manuals call it a header. anyway, a minor point.
the merc pictures show the turbo at the back (?) of the engine, and yes, i had overlooked the fact that the turbo would have to be between the manifold/header and the exhaust outlet. but if this is the final position of the turbo, it will be interesting to see what the full exhaust configuration will be. now i think of it, how will both banks be linked to a single turbo, or will it run off one bank only? that would entail two different layouts, requiring some tricky balancing of output gasses.
from a technical point of view, even though i do not like turbos, the overall concept is quite interesting.
fuel will be down from 150kg to 100kg, so the improved breathing and combustion will use only two thirds of current fuel.