das Posted April 18, 2012 Report Share Posted April 18, 2012 hi new to site after a little help just got a bmw 320D 136 bhp and its started nocking and lost power on investigation found crankshaft broke. had lot of silly qotes for engines. but found rover use bmw engine so could any one tell me the differance between them apart from price please HELP bmw m47n and rover m47r differance Link to comment Share on other sites More sharing options...
momo Posted April 18, 2012 Report Share Posted April 18, 2012 Welcome! Tbh I don't think many will know the answer.. All I know is that the Rover version is a de-tuned version of the BMW engine with smaller inlet manifold and turbo. As for core engine components like the crank - no idea mate! Block will probably be the same but again, no idea if that's true or not. Sorry. Link to comment Share on other sites More sharing options...
Guest T.C Posted April 19, 2012 Report Share Posted April 19, 2012 hi new to site after a little help just got a bmw 320D 136 bhp and its started nocking and lost power on investigation found crankshaft broke. had lot of silly qotes for engines. but found rover use bmw engine so could any one tell me the differance between them apart from price please HELP bmw m47n and rover m47r differance but now you have got M47 engine and rover has got m47r so its on common rail another injectors , inlet manifold , turbo etc.. Link to comment Share on other sites More sharing options...
das Posted April 20, 2012 Author Report Share Posted April 20, 2012 thanks for your comments if i use it. it will just be the main lump with bmw running gear thank Link to comment Share on other sites More sharing options...
CliffThomson Posted April 20, 2012 Report Share Posted April 20, 2012 As said, block and crank/pistons and valvegear should be the same. You should be able to swap most stuff over and have effectively the same engine. DO check though. Might be worth having a proper look before you do this. As you're taking your engine out of the car anyway, why not do that first before you go looking at rover engines as a possible drop in? At least then you'll see what you need to change over and be able to anticipate any problems. C. Link to comment Share on other sites More sharing options...
Dr T Posted April 20, 2012 Report Share Posted April 20, 2012 as said above, you're running an M47 atm aren't you? that's has a 88mm throw crankshaft, the M47N has a 90mm throw (stroke), i'm not sure if there are other differences in the electronics etc between the two engines. eitherway i suspect putting an m47n engine into a car that had an m47 might be harder than it sounds. Link to comment Share on other sites More sharing options...
Guest T.C Posted May 9, 2012 Report Share Posted May 9, 2012 but it is not impossible ... Link to comment Share on other sites More sharing options...
autosri Posted May 9, 2012 Report Share Posted May 9, 2012 im sure its not impossable but would be costly so why not just do it properly and get the correct bit in the first place as you will have to buy the rover engine and might find out its totaly wrong how much difference in price is there between the two engines Link to comment Share on other sites More sharing options...
Dr T Posted May 10, 2012 Report Share Posted May 10, 2012 just to add to this, i think the rover crank has a shorter nose (bit at the front of the engine) than the M47 crank (the M47N crank also has a shorter nose and i think the rover engine is more closely related to this than the M47 you have). you can add on a bit but a two part crank is in my view seriously asking for trouble, and when i say trouble i mean trouble in the shape of the crank coming apart while running. I suspect if that happened it wouldn't even be worth opening the bonnet to look at the damage. Link to comment Share on other sites More sharing options...
PDL Posted May 10, 2012 Report Share Posted May 10, 2012 Hi, if you have an m47 engine then you need a m47 crank, both the rover and the m47n cranks are different, both shorter noses and the rover has a crank sensor gear, if that was the only problem then it could be removed easily. the m47 is a longer stroke as well, and i do belive the rover is as well 90 mm as the m47 is 88 mm stroke, so you would have to change the rod and piston as these are both different as well. Where abouts did the crank break, because it could have twisted the block i bought a compact with a broken crank on No 5 main and it twisted the main cap. I got round it by line boring the block, if you want any more advice call me on 07774027676 phil I have all three cranks here and could send you a picture of them if required. Before you ask the cranks are spoken for for engine jobs. sorry Link to comment Share on other sites More sharing options...
