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BMW Swirl Flaps Upgrade / Replacement & How i did it | E90 320D M47 engine (2.0 diesel)
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- Опубліковано 23 лип 2022
- BMW Swirl Flaps Upgrade | Replacement How i did it
Engines are complex constructions with hundreds or thousands of components working in perfect synchronisation, each component working within parameters carefully measured and imposed by the manufacturers. Even if we consider some parts more important than others, this myth is as wrong as it is bad for the engine. Each part was put there for a purpose, having a role as important as the rest of the component parts.
The same is true of the famous swirl flaps, one of the most controversial components of diesel engines since the early 2000s. And today's article is all about these flaps, today's article separates the myth from the reality.
What is the role of swirl flaps?
The swirl flaps, or "swirl flaps" in the international name, are located in front of the intake valves and have the role of creating a swirl effect in the cylinder. By creating these turbulences, the fuel is burned in an efficient manner. How is this vortex effect achieved? - The channel of an upstream valve is closed, the intake is realised only through a single valve, the admitted air will have a higher speed due to the halving of the passage section.
What are the advantages of swirl flaps?
These flaps were thought of in the early 2000s, when the auto industry began to take timid but firm steps toward reducing pollution. The transition from Euro 2 to Euro 3 was made slowly, and the swirl flaps helped by significantly reducing NOX and Hydrocarbon emissions.
But the more efficient burning of the fuel not only reduced the emissions of harmful substances, but also reduced the fuel consumption, especially for light loads encountered predominantly in urban travel. This is one of the main advantages, contrary to the common myth that these flaps have no significant utility.
Why are swirl flaps so contested?
Because they had the same problem as any new technology, namely reliability. Today's swirl flaps are much more robust, being adopted not only by BMW but also by other manufacturers such as Audi, Ford or Opel (etc). However, the swirl flaps fitted to BMW's M47 or M57 engines had a few problems that tarnished their reputation beyond repair.
The swirl flaps are held to the shaft by means of screws, which have a flattened end to take the shape of a rivet. However, as time passes and wear sets in, the bolts can break and the valves end up directly in the cylinder.
Breakage of the tabs is also caused by the weakened area near the bolt hole aided by the milling of the shaft.
Carbon deposits are another cause for concern, this clogs the intake port and puts pressure on the whole assembly. Swirl flaps are affected and can fail, coming off and ending up in the cylinder.
Both scenarios are fatal to the engine, and valve wear cannot be checked electronically, the only solution being preventive change. Many drivers, unfortunately, have chosen to completely eliminate these flaps, considering them to be a kind of appendage to the engine, a component without which the car functions the same. On the contrary, the physical removal of the flaps leads to increased fuel consumption and a higher level of noxious emissions.
Which BMW models had these fragile flaps installed?
Models with M47 engine (2.0 diesel):
Series 3 E46 318d and 320d
Series 3 E90 318d
Series 1 E87 118d and 120d
5 Series E39 and E60 520d (models up to 2006)
BMW X3 2.0d until 2006
Non-BMW models with this engine:
Land Rover Freelander from 2001 - 2006
Rover 75 from the period 1999 - 2004.
Models with M57 engine (2.5 or 3.0 diesel)
Series 3 E46 330d/330xd and E90 325d, 330d and 335d.
Series 5 E39 525d and 530d and E60 525d and 530d
Series 6 E63 635d
Series 7 E38 and E65 730d
BMW X5 E53 and E70 with the 3.0d engine
BMW X3 E83 with the 3.0d engine
BMW X6 E71 xDrive35d
Other non-BMW models with the M57 engine:
Land Rover Range Rover LR322 (2002-2006) with the 3.0 diesel engine.
Having said that, we hope we have been able to explain the importance of these swirl flaps. It is not just about our passion for BMW, as these components have a wide application on a large number of vehicles. For this reason we dedicated time and energy to come up with a new and effective solution that eliminates any fear on the reliability side.
Perfect. Professional decision. Sunt de aceeași părere ca și tine. Și eu am comandat aceleași clapete tot de la redsolution, și aștept să le schimb și eu. Face toți banii acest video, deoarece nu e greu de schimbat. Datorită ție le voi schimba și eu singur. Mulțumesc frumos 👍🏻
Să-ți spun sincer m-au speriat discuțiile despre ce se poate intampla cu cele originale dar nu am văzut nici o urma de uzură sau deteriorare cand le-am schimbat. Erau imaculate și bine făcute și cele originale. Nit-urile greu de distrus. Șuruburi nituite la capăt. Nu cred ca sunt supuse la niciun stres asa mare incat sa cedeze. Cine stie cine a pornit ideea dar ...anyways...le-am schimbat acum dar nu stiu daca-i asa necesar. Asa de liniste sufleteasca. Am adresat mai multe aspecte cu aceeași ocazie.
@@FlyHighWavesSounds O intrebare. Aceste clapete nu au riscul sa se rupa ele, nu?
Nu prea...sunt făcute dintr-o bucata la propriu. Celelalte au o tija placutele nituite dar eu zic sa nu le schimbi. Erau perfecte a mele la peste 100.000km si m-am chinuit sa le rup...Nu știu exact la ce model a fost o problema dar nu cred ca ii clara treaba. Eu le-am schimbat pentru ca am făcut tot felul de upgrade-uri si am schimbat tot ce era de schimbat preventiv. a pornit de la starter si trebuind sa dau jos partea de sus am facut-o pentru ca oricum masina sta nefolosita pentru ca sunt in UK. A fost o vara in care am lucrat la masina ...De la filtre la curea, separator de ulei, aceste clapete și curățat intake-ul si catalizatorul , ...tot...ve se putea...Anyways... eu zic ca nu trebuie dar daca vrei ca "upgrade" do it man!
@@FlyHighWavesSounds Chestia e ca vreau sa-mi iau un e60, ador cum arata masina dar mereu m-am ferit de bmw-uri pt ca li s-a dus reputatia ca-s stricacioase si bagi carute de bani in ele. Ei si am zis sa fac upgrade de la 1.9 dci la ceva mai potent si fiabil pentru ca deja am 300k la bord. Singurele optiuni fiabile pe care as merge ar fi 2.2 honda sau 3.0 m57 (oriunde am cautat motoare fiabile a aparut asta). M-am tot documentat si cautat si am zis ok. Hai ca merg pe bmw ca totusi imbin un motor potent si fiabil cu o caroserie care-mi place. Am gasit un model cu unic proprietar cu 191xxx km si am zis ca mai bine dau pe un bmw vechi dar intretinut peste pretul pietei, bani la care as putea lua o honda 2.2 cu km putini. Chestia e ca trb sa aflu daca proprietarul a avut probleme cu clapetele si daca nu a avut, le dau jos. Oricum masina e e3, motorul de fonta care din ce-am inteles ar fi ceva mai rezistent decat cel de aluminiu. (da-mi un sfat daca stii mai bine).
Inca nu am auzit de masina care nu se strica. Fiecare are problemele ei. Preventiv am schimbat si eu ce am văzut pe net ca apare plus ca era momentul pentru overall service time. Starter-ul, uleiuri, filtru de motorina, aer, uleiul in cutia de transmisie schimbat, separator de ulei, inchizatorile din fața le-am reparat, spălat si curățat de depozite, EGR curat bec si deasemenea radiatorul de la EGR, cureaua de transmisie care sta puțin cam aiurea pentru ca de obicei se schimba si rolele. Am reconditionat a doua oară scaunele de piele la care am si un video. Trebuie din cand in cand cate o revizie daca ești pretențios dar facand totul cu mana mea si cu pasiune n-am cheltuit prea mult. Plus un set Michelin de tyres. Cred ca sub 500 am cheltuit. Nu-s specialist dar imi place sa fac chestii pentru mine si cu pasiune si atenție trebuie pus ceva timp in orice. Dacă uleiul ii schimbat mai repede decat trebuie si overall toate merg ok trebuie sa tina de obicei. Majoritatea cu probleme is de la cei ce nu au avut grija. Absolut tot ce am a avut nevoie de ceva reparație. Ma refer la orice...toate se strica pana la urma mai repede sau mai tarziu.
i have the N47, but man, what a superb work and video, pure Tech porn right here. subbed
had problems with the new flaps.

Great video thanks
With pleasure. Thanks for reaching out with your appreciation.
Good video and for sure, the best solution (better than remove them). I own a car with this engine. Where can I find this kit? Almost all in the internet is for removing them...
It is on the video in the end where i show the invoice and the cost and there is the website. I ordered them online.
Hello !
Just found your video.
Mine should be in good condition but I plan on removing the intake just to see if they have started to go bad.
And since I would be doing this job why not upgrade to these.
Do you still own the car ?
How many km since you did the job and everything is still fine ?
I have the car and still going on. I have not been driving much lately. I changed mine on 100k miles and the original where perfect. Not sure it is a problem with my model but I did it like you said to be sure since the plan was to clean everything.
How BMW SHOULD have designed these from the get go! But they failed with the early plastic units and failed again with the metal ones... That being said, what's the orange looking grease you used? Is that cupper based vaseline? Why using that on plastic and rubber parts? I thought it was suited for hard surfaces, metal on metal. Just curious...
Do you have the experience with these flaps failing? I found mine before replacing in pristine condition. I think is a bit of an overreacting overall. I don't think people should be that scared about these failing that often. My examination concluded that are quite well built. At least mine where. Repacing them I had to remove the rivets from the installed ones to take them out and was not that easy. I don't think there are so much stress placed on them to fail that easy. Anyways...to answer your question is copper grease that is made for high temperature. The same used for injectors.
It mentions the 320d but does the 330d also have the flaps?
These are the informations back then. You will need to research. I think these where the new flaps manufacturer. They have on their website the description from the end of the video. There will be a good starting point. In the video the invoice frame is sowing the website.
Is there a way to find out if they were already removed by previous owners?
Only if they are not the original ones. For this you need to get in. In my case since i wanted to do a cleaning i addressed multiple things at once. Thanks for reaching out with your question.
I have ordered and fitted this Redo kit, the swirl flaps don’t fit the intake manifold inner guides very well, to tight and the vacuum pressure isn’t enough to return them to centre. Jammed swirl flaps. Not ideal. Did you have any issues ?
I placed a lot of grease from the start. I noticed that they were a bit tight but in time they might get loose. I haven't noticed anything strange about mine yet but I don't use the car for a while since mine is not registered in the UK and since Brexit is more complicated and expensive. That is the reason why I did some extensive work on it including these flaps. I hope will be alright for you. If not my approach will be to sand a bit the contact points for smoothness but that means removing them.
If they're tight now, would they not jam up even easier if there was a slight carbon build up?
De ce sa nu le anulez!?
copper paste against aluminium :0
For the heat resistance. Freestyle choice.
Where i van order these SwirFlaps?
Please follow the video on the end where i show the invoice. There are all the details and the website.
hello, where can I find this upgrade kit?
Watch from 17:30….
@@robturner2560 thank
What is the purpose of the copper coloured grease?
Maybe is late my reply but...is copper heat-resistant grease used for injectors and stuff under heat. I decided to grease everything with it since heat is present. It was my choice without any recommendation. I hope this answers your question.
@@FlyHighWavesSounds why did you grease the screws as well tho ?
@@animation01boy Because he's clueless and someone needs to take that stupid grease away from him. "Without any recommendation"...yeah bud, we know.
Metal rubbing on cheap plastic 😂
They really didn't care when they designed these engines.