Exhaust flap

[Beagle]

Theres some vids on youtube on how to deal with it.

[Beagle]

Would this help applied to pivot points?

Exhaust temp can be 1200 degrees F at the headers.


It must be a lot less where the Flapper valve is surely?

https://www.superior-industries.com/dsf_5000_product_122.html

[Levisp]

Would this help applied to pivot points?

Exhaust temp can be 1200 degrees F at the headers.


It must be a lot less where the Flapper valve is surely?

https://www.superior-industries.com/dsf_5000_product_122.html

Nice idea but how do you get to the pivot to lube. Don't think it comes part. If anyone knows better please share.

[Beagle]

https://m.youtube.com/watch?v=8sMd6rxOY2I


I fit an Akrapovic silencer recently and saw the valve when I removed the original. Arent the pivot points visible then?

[Casbar]

You can't take it apart, but you can see it if you take off the silencer. Don't think squirting stuff on it helps much, once the pivot is worn your onto a loser.

[Beagle]

I dont believe wear is the problem in fact the opposite. Carbon buildup and corrosion leads to seizure.

[Levisp]

Yes you can certainly see the flap and pivot when you take the silencer off. However the actual bearing surfaces that the pivot moves could only be lubed if you can get at them. The bottom of the pivot underneath the pipe is capped. I cannot see how you can take it apart to grease it. The best you could do is squirt something on it from the inside but as a previous post states I very much doubt it would do anything. Basically its a bloody useless design. The other solution to a seized flap apart from replacing the exhaust pipe would be to take it off and find an exhaust fabricator to cut it off and weld a connecting piece without flap in its place. Think there are ways around spending huge amounts of money on a new exhaust for it to only happen again some time in the future.

[Levisp]

If BMW cannot make an exhaust flap last lets hope the engineer who is responsible for the more complicated valve mechanism has got it right. Good luck to anyone who buys the latest and greatest next year.

[Sethmopp]

I think Black Widow make alternate headers that seem to dispense with the valve, they're about £315 on fleabay.

[Levisp]

I think Black Widow make alternate headers that seem to dispense with the valve, they're about £315 on fleabay.

Thanks for info nice one.


https://www.blackwidowexhausts.co.uk/bm ... 3792-p.asp


If mine goes this is what I will do. Only thought is would the bike need re-mapping. However if it does still cheaper than OEM replacement.

[B787MECH]

Thanks for info nice one.


https://www.blackwidowexhausts.co.uk/bm ... 3792-p.asp


If mine goes this is what I will do. Only thought is would the bike need re-mapping. However if it does still cheaper than OEM replacement.

Interesting link, although the problem of the valve actuator would still need to be addressed as it would probably detect a fault. The guys at https://www.healtech-electronics.com/products/ese/ seem to make a servo eliminator but you'd have to confirm it fits the LC.


Sent from my iPad using Tapatalk

[Levisp]

Interesting. However I think if you leave the motor connected but just remove the cables then the system sees no fault because the actuator motor is still working. If someone has done this maybe they can confirm it.

[B787MECH]

Interesting. However I think if you leave the motor connected but just remove the cables then the system sees no fault because the actuator motor is still working. If someone has done this maybe they can confirm it.

I share your logic but going on previous experience (on a Aprilia) simply removing the cables is not the end of the story as the actuator runs past its normal limit and throws up a fault.


Sent from my iPad using Tapatalk

[Casbar]

Well Mr BMW has agreed to replace the exhaust again. So I am taking it in on Friday as it needs to be done before my warranty runs out on the 4th Oct. 2014 bike, 17k and will now be on my second set of headers.

[kioolt]

Here's a company that makes a device that fools the ECU into thinking the servo is still connected.


https://www.skutr.net/exhaust-valves-an ... explained/


They also have an explanation of what the exhaust flap is for.