What year did BMW stop using swirl flaps?
2008
BMW stopped using the swirl flaps in their engines at the end of 2008 and discontinued the flaps in most of their engines after 2010.
Should I remove BMW swirl flaps?
This has the benefit of altering the torque output of the engine but mainly reducing the engine’s emissions at idle. In normal driving the swirl flaps are open, the shortest route, so by removing the complete flap there is little to no performance difference felt when driving the vehicle.
What do swirl flaps do BMW?
What are swirl flaps? Swirl flaps are small butterfly valves located within the inlet manifold on modern diesel engines. They are designed to help regulate the fuel to air ratio and improve emissions at low engine speeds. At light engine loads the flaps close, causing the air to swirl into the combustion chamber.
Do BMW still use swirl flaps?
However, there have been BMW vehicles registered up to 2007 with early type 22mm swirl flaps fitted) and despite the increased spindle diameter, there have been reports from BMW owners still having swirl flap failure on these cars so it’s up to you if you choose to ignore the warnings if you own a later year car!
Do swirl flaps need mapping out?
You don’t ‘need’ to blank egr or swirl flaps if they are mapped out – they just stay shut.
What happens when swirl flaps fail?
When a swirl flap fails, the debris drops down into the engine, either sticking in the valve port and jamming it open, causing the piston to collide with the valve, or falls into the cylinder itself causing the piston, valves and head to become damaged.
What is the purpose of swirl flaps?
Swirl flaps produce a swirl alongside the cylinder axle. They are used in diesel vehicles to improve the mixing of the fuel-air mixture at low engine speeds. For this purpose, the air is fed to each cylinder through two separate channels in the intake manifold.
What do intake swirl flaps do?
Swirl flaps produce a swirl alongside the cylinder axle. They are used in diesel vehicles to improve the mixing of the fuel-air mixture at low engine speeds. For this purpose, the air is fed to each cylinder through two separate channels in the intake manifold. Swirl flaps are also called “inlet duct cutoffs”.
How big are the swirl flaps on a BMW?
There are two sizes of swirl flaps fitted to BMW vehicles 22mm and 33mm; as a general guide pre 2005 models are normally fitted with 22mm size, 2005-2006 either size could be fitted to your vehicle, 2006+ 33mm likely to be fitted.
Can a swirl flap be removed from an engine?
The below picture is of a used swirl flap removed from a vehicle with 80,000 miles on the clock, as you can see the shaft is fractured (where the closest bolt meets the base). Swirl flap removed from a 80,000 mile engine.
Do you have to change filter on BMW 320d?
The BMW dealers have also incorporated a change of this filter as part of every inspection 2 as well!, but this is a recent introduction of many cars of this age, never had them changed as part of the servicing routine, and I don’t doubt that the one on your 320D was an original.