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BMW N55 Engine

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BMW N55 Engine For Sale

This engine was introduced in the autumn of 2009 and is derived from the 3-liter biturbo N54, from which it differs in the presence of a single turbocharger. The new engine, however, is capable of delivering performance equal to that of the unit presented in 2006. In fact, if on the one hand a turbocharger is missing, on the other hand it is possible to mount and exploit the Valvetronic device, absent in the N54, which allows a more complete management of the opening of the valves, both in timing and in lift. In addition, the only turbocharger used uses twin-scroll technology, which consists in dividing the turbine and the exhaust manifold into two zones, each destined for the exhaust flow of three of the 6 cylinders of the engine. The effect obtained is that of obtaining two exhaust waves which, upon their arrival inside the turbine, do not interfere with each other, causing losses of kinetic energy, and also avoids having gas reflux effects. during the subsequent opening of the intake valve of the same cylinder.


Best Engine Replacement Procedure
  1. Swap the engine’s oil, fuel and oil filters, and coolant.
  2. Install new engine and external coolers if existing.
  3. Cleanse the cooling system thoroughly, then replace the water pump.
  4. Renew necessary hoses and belts.
  5. Install a new timing belt, spark plugs, and wires.
  6. Replace essential gaskets and seals, focusing on the oil pan, front, and rear main seals.
  7. Clear the vehicle’s computer codes before engine installation.
  8. Ensure the replacement engine matches the original specifications.
  9. Transfer exhaust manifolds, mounts, distributor, and sensors from the old engine.
  10. Disable fuel and ignition before ignition to prime the oil.
  11. Ensure no plugs or tape remain on the engine before installation.
7 Common Mistakes to AVOID!
  1. Not resetting the vehicle’s computer codes before installation.
  2. Skipping the step of adding engine oil before the first startup.
  3. Forgetting to deactivate the fuel and ignition systems, essential for priming the oil.
  4. Ignoring the replacement of the oil cooler or the radiator’s integrated oil cooler.
  5. Overlooking the cleaning of the radiator and checking the operation of the cooling fans.
  6. Not swapping out the flywheel and its securing bolts.
  7. Trying to initiate the engine’s first run without proper priming.