weslangdon Posted March 1, 2019 Report Share Posted March 1, 2019 There are a few different engine codes for these engines varying with the vehicles they were fitted to, has anyone used a Polo TDI engine with the BNV BNM or BMS codes, are they interchangeable? This could be an issue if the Lupo engine ever breaks or for someone with a Polo or a Fabia looking to fit a TDI unit from a Lupo or an Arosa Quote Link to comment Share on other sites More sharing options...
Sausage Posted March 1, 2019 Report Share Posted March 1, 2019 They are physically the same but off the top of my head I think some (or all) of them have crank position sensor triggered differently. I have a dead BNV on the bench I will go look at it in a mo. The AMF appears to be most robust re oil pump / balance shaft chain shenanigans, based on nothing more than my not seeing (as far as i remember) any reports of failure on them and many AMF engines going 200+k mileage but plenty of failures on the later variants. 1 Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 1, 2019 Report Share Posted March 1, 2019 A while back I discovered an alternative engine code for the SDI... Standard is AKU. There is another code in my silver SDI. From new. 1.7 diesel. Looks and runs exactly the same as my other SDI. When I find it again I'll post it. 1 Quote Link to comment Share on other sites More sharing options...
Sausage Posted March 1, 2019 Report Share Posted March 1, 2019 (edited) Here u go: https://uk-polos.net/viewtopic.php?f=43&t=63759 bottom of page 1 BMS is different crank sensor and oil level sensor. I have a spare AMF out of Audi A2 if you are in need. Edited March 1, 2019 by Sausage 1 Quote Link to comment Share on other sites More sharing options...
Rich Posted March 1, 2019 Report Share Posted March 1, 2019 I know the later Fabia can be fitted to a Lupo. 1 Quote Link to comment Share on other sites More sharing options...
weslangdon Posted March 1, 2019 Author Report Share Posted March 1, 2019 2 hours ago, Sausage said: Here u go: https://uk-polos.net/viewtopic.php?f=43&t=63759 bottom of page 1 BMS is different crank sensor and oil level sensor. I have a spare AMF out of Audi A2 if you are in need. Its to go into a 57 plate Polo, which has a seized engine, I would agree with the comments about the later engines being weaker, I have two 2001 TDI's with huge mileages, whereas this failed engine on the Polo only has 66,000 miles on it. Quote Link to comment Share on other sites More sharing options...
Rich Posted March 1, 2019 Report Share Posted March 1, 2019 I wouldn't bother doing the swap and I would just buy my 9n3 which i am looking to offload so I can spend some proper money on fuel. 1 Quote Link to comment Share on other sites More sharing options...
weslangdon Posted March 1, 2019 Author Report Share Posted March 1, 2019 Too far away, sorry Quote Link to comment Share on other sites More sharing options...
mk2 Posted March 1, 2019 Report Share Posted March 1, 2019 2 hours ago, weslangdon said: Its to go into a 57 plate Polo, which has a seized engine, I would agree with the comments about the later engines being weaker, I have two 2001 TDI's with huge mileages, whereas this failed engine on the Polo only has 66,000 miles on it. So whats the deal there? What's the main differences between these engines? As far as I knew, there are a few design changes, but by and large the same power plant...? It's the main reason I went down the route of SDI instead of 3 pot TDi. Curious.... hmmm. Quote Link to comment Share on other sites More sharing options...
Sausage Posted March 1, 2019 Report Share Posted March 1, 2019 No idea why the later versions apparently fail more, it might be just a numbers thing with far less AMF being used, but it sure doesnt read that way. Pretty sure there is nothing different about the mechanical parts in question either. Quote Link to comment Share on other sites More sharing options...
Johnni_Winther Posted July 11, 2020 Report Share Posted July 11, 2020 Hi guys. I have swaped my fabia's 1,4 tdi bms to a BMN i needed to interchange the inlet and exhaust manifolds turbo and oil piping. There is the issue with some studs not being cast on the bmn so I have made a bracket to carry the coolant heat exchanger. And the bms being with PDF this needed to mount aswell. Allso the valve cover. But now the "new" bmn wont start it turns fine. What could be the problem? Is the firering different on the 2 or the cableing for the injectors? Best regards Quote Link to comment Share on other sites More sharing options...
Rich Posted July 11, 2020 Report Share Posted July 11, 2020 Bmn, 170 16v. What management are you running? Quote Link to comment Share on other sites More sharing options...
Johnni_Winther Posted July 12, 2020 Report Share Posted July 12, 2020 Sorry I got the code turned around I have installed a BNM 1,4 TDI 3 cyl. in a 2008 Fabia that had a BMS 1,4 TDI and It turns over fine but dos not start up. To my eye the basic engine is the same. the only apparent difference is the BHP output probably due the BMS running with different turbo set up and higher diesel pressure. The things being directly different is the crankshaft pickup and the flywheel... Maybe it is here the fault is? My focus was on the clutch fitting so for this I changed the flywheel. maybe the pickup is feeling in a different point... I think I need to take the gearbox of again and fit the distance plate from the BNM and put the old Flywheel back... Thanks for making me think... Best regards Quote Link to comment Share on other sites More sharing options...
Rich Posted July 13, 2020 Report Share Posted July 13, 2020 I think you're on the right track. But this has been done before without issues. Quote Link to comment Share on other sites More sharing options...
Ianandclair Posted July 15, 2023 Report Share Posted July 15, 2023 Hi I’ll be doing this conversion soon, BNM engine into a BMS car, did you overcome the not starting issue? Is it the crankshaft sensor? Thanks for any help you can give me Quote Link to comment Share on other sites More sharing options...
Rich Posted July 16, 2023 Report Share Posted July 16, 2023 I've never had the non starting issue, I chucked an amf into a 9n3 polo and the crank sensors were the same so I had no worries. Quote Link to comment Share on other sites More sharing options...
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