Nute Posted December 3 Share Posted December 3 I've come to the conclusion that I can't delete this thing. I think it's made by Bosh, it's on my BMW, originally housed in an ugly plastic box between the intake filter and the induction manifold. Appears to have a spring loaded metal flap in it which is opened progressively as airflow increases, I assume to vary the timing. It was originally mounted so that the pivot spindle around which the flap rotates was vertical, so the flap thing moved on the horizontal plane - not influenced by gravity. Any idea if I can rotate it so the spindle is horizontal and the flap thing will move in the vertical plane? The flap thing doesn't have much mass and it still closes against the stop when rotated. Link to comment Share on other sites More sharing options...
Catteeclan Posted December 4 Share Posted December 4 9 hours ago, Nute said: I've come to the conclusion that I can't delete this thing. I think it's made by Bosh, it's on my BMW, originally housed in an ugly plastic box between the intake filter and the induction manifold. Appears to have a spring loaded metal flap in it which is opened progressively as airflow increases, I assume to vary the timing. It's measuring the amount of air being drawn into the engine. It sends a varied voltage to the ECU which can adjust the fuel trim and timing. Not something you can do without. 9 hours ago, Nute said: It was originally mounted so that the pivot spindle around which the flap rotates was vertical, so the flap thing moved on the horizontal plane - not influenced by gravity. Any idea if I can rotate it so the spindle is horizontal and the flap thing will move in the vertical plane? The flap thing doesn't have much mass and it still closes against the stop when rotated. It could influence the running but couldn't say how much. This a kit car project or something? Link to comment Share on other sites More sharing options...
Nute Posted December 4 Author Share Posted December 4 Thanks, it’s on a BMW K100 so bike not a car. It’s big and ugly so was looking to get rid but changing its orientation will help. I’ll just try it and see I guess. 1 Link to comment Share on other sites More sharing options...
Buckster Posted December 4 Share Posted December 4 Yes you can rotate it. There are airbox delete kits or there used to be that had a 90 degree bend pipe that also required the sensor to be rotated. 1 Link to comment Share on other sites More sharing options...
Nute Posted December 4 Author Share Posted December 4 Thanks @Buckster, Seen the delete kits for the 16v versions but mine is an 8 so apparently they don't work due to the different fuel injection controls, so I have to keep the sodding thing. Ill try it rotated and see what happens Link to comment Share on other sites More sharing options...
Buckster Posted December 4 Share Posted December 4 20 minutes ago, Nute said: Thanks @Buckster, Seen the delete kits for the 16v versions but mine is an 8 so apparently they don't work due to the different fuel injection controls, so I have to keep the sodding thing. Ill try it rotated and see what happens Deleting it is a pain because you then need to have the fuel management reprogrammed and even then they tend to run like crap, you can service the unit though if it gives problems. 1 Link to comment Share on other sites More sharing options...
Pedro Posted December 4 Share Posted December 4 2 hours ago, Nute said: Thanks @Buckster, Seen the delete kits for the 16v versions but mine is an 8 so apparently they don't work due to the different fuel injection controls, so I have to keep the sodding thing. Ill try it rotated and see what happens It's not a mechanically beautiful bike anyway, to put it gently, so might as well show that off. If you can hide it, hide it. If you can't hide it, exaggerate it 1 Link to comment Share on other sites More sharing options...
Buckster Posted December 4 Share Posted December 4 52 minutes ago, Pedro said: It's not a mechanically beautiful bike anyway, to put it gently, so might as well show that off. If you can hide it, hide it. If you can't hide it, exaggerate it Exactly, paint the engine bright red. 1 Link to comment Share on other sites More sharing options...
Nute Posted December 4 Author Share Posted December 4 I cannot argue with that ... but I like it Its this thing ... I could totally get rid of it if I bought a set of 16v throttle bodies plus the 16v fuel injection unit ... but I have to do everything the hard way. Looks better from the other side. 4 Link to comment Share on other sites More sharing options...
Catteeclan Posted December 4 Share Posted December 4 Could you make something to cover it. You could replace it with MAP sensor but you'd need some clever bugga to create a new map for the ecu. Link to comment Share on other sites More sharing options...
Buckster Posted December 4 Share Posted December 4 47 minutes ago, Nute said: I cannot argue with that ... but I like it Its this thing ... I could totally get rid of it if I bought a set of 16v throttle bodies plus the 16v fuel injection unit ... but I have to do everything the hard way. Looks better from the other side. The standard box is plastic, that is custom. Link to comment Share on other sites More sharing options...
Buckster Posted December 4 Share Posted December 4 There should be a cone filter on the end of the elbow. Link to comment Share on other sites More sharing options...
Nute Posted December 4 Author Share Posted December 4 Yeah, sorry should have said that isn't the std manifold, the plastic one is in the bin. Originally there were two plastic boxes, the collector box that goes on top of the throttle bodied then another one which has the MAS in it. To use the MAS exposed I need to make a bracket for it as it's just hanging in the breeze at the moment. I'll weld a tab to the frame and bolt the bracket back to that. The original collector box had a series of washers in each of the 4 internal tubes to restrict the airflow - its been someone's A2 bike at some stage. Link to comment Share on other sites More sharing options...
Vamana Gupta Posted December 5 Share Posted December 5 19 hours ago, Nute said: Yeah, sorry should have said that isn't the std manifold, the plastic one is in the bin. Originally there were two plastic boxes, the collector box that goes on top of the throttle bodied then another one which has the MAS in it. To use the MAS exposed I need to make a bracket for it as it's just hanging in the breeze at the moment. I'll weld a tab to the frame and bolt the bracket back to that. The original collector box had a series of washers in each of the 4 internal tubes to restrict the airflow - its been someone's A2 bike at some stage. Im with Pedro on this one Nute , make it into a ratt bike, no use of making things pretty at this point, slap a fancy copper cover for the sensor... Link to comment Share on other sites More sharing options...
Nute Posted December 5 Author Share Posted December 5 I am actually tempted to keep the fuel tank as is poss together with the forks (with new internals and some bellows) and knobby tyres - I'm not aiming for a cafe racer. In two minds on what to do with the controls, either refurb the originals or bin the whole lot and fit motogadget stuff - love to get rid of the miles and miles of wiring but it would be easy to run up a big bill swapping over to their kit. Link to comment Share on other sites More sharing options...
Nute Posted 2 hours ago Author Share Posted 2 hours ago This is the current state of it with various bit dry fitted. I went with the MAS mounted horizontally in the end the downside is the air intake elbow will need chopping off and re-welding facing forward. The oil sight glass leaks and will need replacing, the centre stand will need the central brace chopping out and welding a bit lower as its very close to fouling the back tyre. I have no idea if the existing loom will work & no idea what to do about the clocks at the moment. I hate the plastic box with all the clockwork electrics and the 8 million wires so thinking about trying motogadget replacements. If I can get it finished or at least working and ride it next summer I'll be satisfied. Link to comment Share on other sites More sharing options...
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