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Aug 24th, 2023
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Joined: Sep 2012
Posts: 1,959 Likes: 15
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Sep 2012
Posts: 1,959 Likes: 15 |
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Joined: Aug 2013
Posts: 15,794 Likes: 14
Formerly known as Aldermog Member of the Inner Circle
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OP
Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 14 |
I was curious as to why the vacuum pump had 2 ports. I found this on the web, which explains all.  Exhaust flap valve...I guess on a cross pipe linking the LH and RHS exhausts, the flap will close when in sport mode, or something. Any BMW expert here? This is the front of the engine in an Aero chassis, the pump is upper left.  Complicated, isn't it? Not at all surprised the bonnet, front bodywork and O/S wing had to come off.
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: Sep 2012
Posts: 1,959 Likes: 15
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Sep 2012
Posts: 1,959 Likes: 15 |
Think Williams have taken more than the wings & cowl off 
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Joined: Apr 2012
Posts: 5,013 Likes: 32
Charter Member
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Charter Member
Joined: Apr 2012
Posts: 5,013 Likes: 32 |
Incredibly complex engine.... I am always slightly boggled by who designs these things!
+8 4.8
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Joined: Jan 2012
Posts: 14,976 Likes: 1
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jan 2012
Posts: 14,976 Likes: 1 |
Pleased to hear it is fixed.
Richard
1976 4/4 4 Seater
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Joined: Aug 2013
Posts: 15,794 Likes: 14
Formerly known as Aldermog Member of the Inner Circle
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OP
Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 14 |
Think Williams have taken more than the wings & cowl off And done a LOT of cleaning and polishing of bits not normally seen...almoist like new!! 
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Joined: Oct 2012
Posts: 6,538
Talk Morgan Sage
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Talk Morgan Sage
Joined: Oct 2012
Posts: 6,538 |
Great news Peter - delighted for you.
Hopefully not to severe a hit on the wallet!!
And your smiles returned!!
Neil
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Joined: Mar 2014
Posts: 246
L - Learner Plates On
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L - Learner Plates On
Joined: Mar 2014
Posts: 246 |
Peter, thanks for the update. I've added this to my "ones to watch list", as I did the issue on the potential failure of side-exhaust bracket. Sadly, that one I have experienced, in-spite of taking mitigation actions.
Time will tell on Vac Pump.
J. Neil
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Joined: May 2010
Posts: 9,285 Likes: 69
Needs to Get Out More!
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Needs to Get Out More!
Joined: May 2010
Posts: 9,285 Likes: 69 |
I have seen a couple of cars with exhaust flaps. They were to divert the flow from the silencer normal route ( usually not straight) to a straight through alternative pipe. Purpose was to improve flow and noise. Not sure if a BMW is set up like that though.
Some car modders fit a flap valve to dump the ehaust out before the silencer box to the underside, cutting out a big part of the system.
Plus Four MY23 Furka Rouge
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Joined: Aug 2013
Posts: 15,794 Likes: 14
Formerly known as Aldermog Member of the Inner Circle
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OP
Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 14 |
Yes, the C43 has three valves... One opens or closes a transfer pipe between the two sides and the other two divert the exhaust away from the rear silencer on each side. This happens only in "Sport +" mode which, the handbook suggests, is not for road use... 
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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