Should I remove BMW swirl flaps?
While swirl flaps definitely sound great on paper – offering improved fuel efficiency with one small part – they caused a great deal of mechanical problems for BMW owners. If you want to extend the life of your car and enjoy all the benefits of your BMW performance exhaust, we recommend having your swirl flaps removed.
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.
Will removing swirl flaps affect emissions?
In our opinion very little, the reduction in emissions and performance at low engine speeds is almost unnoticeable and would only be relevant if no carbon build up had occurred, due to the fact that carbon build up begins as soon as the vehicle leaves the factory, the removal of the flaps is likely to result in …
Is swirl flap delete legal?
The Swirl flap Delete software is intended for off-road use vehicles only. Removal of a DPF is likely to make your vehicle illegal for use on a public road. This is not legal advice and if you are unsure if this applies to your vehicle, please seek further advice.
Can you clean swirl flaps?
Cleaning your Intake Manifold and Swirl Flaps The moderately expensive alternative is to if possible manually clean them. Most mechanics will recommend this – Why? Because they’ll earn well from the extensive hours it takes to complete the job.
Should swirl flaps be open or closed?
One of the two channels can be closed with a swirl flap. This creates a swirling of the fresh air. Better mixing reduces fuel consumption and pollutant emission. At higher engine speeds and torques, the swirl flap is opened to achieve a better filling level.
How BMW swirl flaps work?
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.
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. One of the two channels can be closed with a swirl flap.