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The BorgWarner developed turbo can produce up to 27 psi (1.9 bar) of boost thanks in part to its unique dual volute turbine housing and an electrically actuated wastegate. Instead of two side-by-side exhaust passages like on a regular twin-scroll turbocharger , in this design the two exhaust passages are concentric and allow for better use of ...
The turbo used is a Mitsubishi TD04 model, the block used is very similar to the 4B11T engine found in Mitsubishi Lancer Evolution X, however most of the rotating assembly is different, with different rod lengths, bearing sizes, and piston compression heights. Additionally the 4B11T is a semi-closed deck block, where the Theta is an open deck ...
Particles in the oil can also cause serious problems with oil pressure. After oil flows through the engine, it returns to the oil pan, and can carry along a lot of debris. The debris can cause problems with the oil pickup screen and the oil pump itself. The holes in the oil pickup screen measure about 0.04 square inches (0.26 cm 2). [6]
The main differences between the naturally aspirated and the turbocharged versions are the cylinder head, injection pump, valves, camshafts, rods, intake and exhaust manifolds and some minor differences like oil feed and return holes for the turbo and different crankcase ventilation system, valve cover and plastic engine cover
Modifications for production engines included oil jets to cool the underside of the pistons; pistons with oil passages; stronger connecting rods; sodium filled valve stems and a stronger nitride-hardened crankshaft. Also an uprated oil pump with separate chain drive was fitted as the turbocharger lubrication required higher flow.
M270 refers to the transverse configuration for front-wheel drive vehicles, while M274 refers to the longitudinally-mounted layout for rear-wheel drive vehicles. [1] Both engines are based on the same design with dual overhead camshafts, 4 valves per cylinder, variable valve timing, direct injection, and compliance with the EU6 emissions standard. [2]