In the year 2011/12, BMW n20 engine made a very bold move in the sense that they replaced their beloved straight six engines with a variety of turbos with four cylinders. The change was driven by tighter emissions regulations and the desire to provide better fuel efficiency. It’s still a controversial choice and the only one models available were one of them, the 3.0 turbo N55.
In its original 2011 version, the bmw N20 was available as a 320i 2.0 turbo as well as its version 328i 2.0 with a larger turbo. Traditionalists, including myself, were not amazed by the latter. There’s not much of a difference in price between the two models since there’s little difference in engineering. Some of the reasons why buyers go for the more affordable variant in UK include a lower annual road tax because of lower emissions, less expensive policies, more economical, and corporate car tax.
In 2013, a 1600cc model was in development to drive the F10 520i. As of the time of writing, all other models run on the two-litre N20, but there are different options of tuning to suit the various Z4, Three, X1, and one series.
Power figures must take a pinch of salt, or three, in particular when it comes to used cars. How efficient the engine and turbo are depends on how it has been maintained and operated. If the engine has accumulated a lot of carbon deposits at the back of the valves, the power will drop quite a amount. In any of the turbo engines, there’s a differences in the state of tune from factory and also for local markets. A good majority of owners will need their cars rebuilt to increase output.
The N26 was designed for the markets that require a very low-emissions N20. It features features like fuel pipes made of all-metal instead of rubber and engine sensors that are added.
In many ways, the N20 is one third of the 6-cylinder N55. The current BMW idea is to create three 6 and 4 cylinder engines , each with 500cc of capacity per cylinder. This is the area where the N20 is located. BMW believes that cars weighing less than 1300kg should be equipped with three cylinders, the N13 and above which is it’s the N20 and for bigger or more powerful models, the six.
The turbo is twin scroll and which is why you’ll notice “Twin Power” on the engine’s Acoustic cover. Twin scroll turbos come with two inlets and nozzles. A small sharply angled one that allows for quick reaction to minimize the turbo’s lag, and a larger angle lower for greater boost production. This is similar to what they did with the turbos with variable incidence. Two exhausts from the cylinder are fed into each turbo nozzle section.
As you’d imagine, the engine was Valvetronic and also had double VANOS. It utilizes Bosch Direct Gas Injection (GDI) as well as a high-pressure (200 bars) fuel pump that is driven by the camshaft for exhaust. It comes with an automated stop and starts as well as an electronic coolant pump in the context of BMW’s Efficient Dynamics measures.
The block is made of aluminum and features iron cylinder liners created using the technology of thin-film deposition. The engine is equipped with a sturdy cast crankshaft that is forged and has four weights for balance. In order to lessen friction in the piston, the central line of the crankshaft’s axis is offset from the cylinders that are above it, which is a first for BMW. The engine is equipped with twin balancer shafts that reduce vibration. It is a breakthrough technology that was first introduced by M43TU. M43TU engine.
Initially, the N43 BMW was having issues with direct injectors as well as ignition coils that failed in the heat of. To address this issue, the N20 included extra cooling passages close to the injectors. The engine came with a revolutionary design for the crankcase ventilation system which was included in the valve cover. Perhaps it will not clog as much.
Since it is a direct-injection engine, the intake valves won’t be clean by the fuel. They’ll build up carbon deposits that need to be cleared by removing the intake manifold every forty-five miles. All GDI engines are affected by this and not only BMWs It’s the cost we pay to get less emissions. This is more likely to happen for engines that don’t very revved and go on many short journeys.
Turbo engines require well-maintained, high-quality oil in order to enjoy a an extended life. Make sure to change the oil prior the interval recommended by the manufacturer. Be aware of the level of the oil and do not allow it to fall below the its minimum.
A recall has been issued of oil starvation in this pump. with this issue, brake servo help can be decreased. Valvetronic engines require an air pump since they don’t have a throttle plate, so they don’t generate an vacuum in the intake manifold.
Tuning these engines to increase power isn’t an issue, as you do it professionally on a smooth road. Avoid “wonder chips” and miracle power chip sellers on eBay.