Design Features
All 149s have overhead camshafts and the cylinder heads fit into the engine block; this is referred to as the "pothead" design. The blowers are also recessed into the block; this section of the block is called the "airbox". Above the blower is a thick piece of steel that covers the blower and seals the top section of the air box. On a turbocharged engine an intercooler and sometimes a by-pass housing is present with the intercooler housing. The 12V,16V configurations have two blocks, two crankshafts bolted together, two blowers, and four turbos. The 16V149 has dual 10-inch (250 mm) exhaust outlets with eight bolt flanges.The 20V149 has 3 engine blocks, 3 crankshafts bolted together. The unique set up of the 20V has a 6V block on either end of a special 8V block with 6 turbos, 3 blowers and intercoolers.
Read more about this topic: Detroit Diesel Series 149
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