btccm3 1 Report post Posted November 6, 2010 (edited) So iv been offered a 3.5 motor from an old 635 and im pretty sure its the same as the 3.0 m30 motor in my 88 530 my question im throwing out there is 1. is the loom the same for the 3.5 e34 as the 3.0? 2. will my 5 speed bolt up to the 3.5 ...bolt spacing and all that? 3. what computer should i use? the one from the 635? my 530 one? or should i just go get one from a 535? any advice with this would be awesome. Edited November 6, 2010 by btccm3 Quote Share this post Link to post Share on other sites
Silver Fox 43 Report post Posted November 6, 2010 What year is the 635? Quote Share this post Link to post Share on other sites
btccm3 1 Report post Posted November 6, 2010 What year is the 635?82 maybe?just sent my father in law a text he's the one with the car. i know his nice one is an 84 and im pretty sure the rusty one is 2 years older i do know the motor is the long stroke one its one gen older than his 84 i know that for sure Quote Share this post Link to post Share on other sites
btccm3 1 Report post Posted November 6, 2010 82 maybe? just sent my father in law a text he's the one with the car. i know his nice one is an 84 and im pretty sure the rusty one is 2 years older i do know the motor is the long stroke one its one gen older than his 84 i know that for sure maybe iv got the year of his nice one wrong....... Quote Share this post Link to post Share on other sites
BM WORLD 1284 Report post Posted November 6, 2010 the old 635csi block doesn't have some mouting points on the block to mate up to your e34 engine mounts , so you will need to do some welding /fabricating etc, just the exhaust side i think . yes use all the e34 manifolds ,brackets , front hub ,wiring loom etc etc and just get a ecu from a e32 735i or e34 535i (can help with that if needed) the old 635csi engine ran a 10:1 compression ratio so a remap of the ecu will get the best out of that engine , otherwise you might get pinking etc . yes the same gearbox will fit to it with no problems . you will need to use the e34 sump and oil pick up etc. Quote Share this post Link to post Share on other sites
btccm3 1 Report post Posted November 11, 2010 (edited) the old 635csi block doesn't have some mouting points on the block to mate up to your e34 engine mounts , so you will need to do some welding /fabricating etc, just the exhaust side i think . yes use all the e34 manifolds ,brackets , front hub ,wiring loom etc etc and just get a ecu from a e32 735i or e34 535i (can help with that if needed) the old 635csi engine ran a 10:1 compression ratio so a remap of the ecu will get the best out of that engine , otherwise you might get pinking etc . yes the same gearbox will fit to it with no problems . you will need to use the e34 sump and oil pick up etc. Cheers Brent.thats the kind of advice i was after, sounds like its not too much of a mission. thanks for the offer with the ecu i think i might take you up on that one. Edited November 11, 2010 by btccm3 Quote Share this post Link to post Share on other sites
