BMW 535d Bottom End
Discussion
Hi all,
My F10 535d (N57, running hybrid turbos kit was from Darkside Developments) might have let go of its bottom end, as advised by my mechanic - though the engine hasn't been fully inspected or opened up yet. The car was running a mild tune (400hp+) with supporting mods (cooling, DPF delete, etc.).
Looking for recommendations:
Who in the UK is best for a performance-oriented N57 rebuild? I need someone who really knows these engines inside out, especially when running hybrids.
Also should I opt for uprated parts during the rebuild (e.g., bearings, con rods, etc.) given the power level and future reliability?
Any advice on reputable specialists or build tips would be greatly appreciated
My F10 535d (N57, running hybrid turbos kit was from Darkside Developments) might have let go of its bottom end, as advised by my mechanic - though the engine hasn't been fully inspected or opened up yet. The car was running a mild tune (400hp+) with supporting mods (cooling, DPF delete, etc.).
Looking for recommendations:
Who in the UK is best for a performance-oriented N57 rebuild? I need someone who really knows these engines inside out, especially when running hybrids.
Also should I opt for uprated parts during the rebuild (e.g., bearings, con rods, etc.) given the power level and future reliability?
Any advice on reputable specialists or build tips would be greatly appreciated
Edited by BMW Kaz on Wednesday 6th August 11:41
Probably wise confirming the bottom end has actually let go first, and what part of it specifically, and also the root cause before going any further, otherwise your nice new engine will go exactly the same way.
It's usually always crap fuel preparation from crappy remaps that fecks these blocks. If the piston crowns have starfish patterns gouged out of them, there's your answer. Pull the injectors out stick a bore scope down there. If they look OK, its likely spun bearings. Usually caused by overboosting at too low an rpm or poor maintenance causing a main bearing to spin, which takes out the nearest 2 rod bearings on the same oil feed.
Remember, the exact same block was used in the triple turbo M50d engine, so 400hp is no sweat for these engines. You don't need to consider stronger rods and pistons unless running stupid power. Have you seen how big M/N57 rods are compared to the petrol engines?
It's usually always crap fuel preparation from crappy remaps that fecks these blocks. If the piston crowns have starfish patterns gouged out of them, there's your answer. Pull the injectors out stick a bore scope down there. If they look OK, its likely spun bearings. Usually caused by overboosting at too low an rpm or poor maintenance causing a main bearing to spin, which takes out the nearest 2 rod bearings on the same oil feed.
Remember, the exact same block was used in the triple turbo M50d engine, so 400hp is no sweat for these engines. You don't need to consider stronger rods and pistons unless running stupid power. Have you seen how big M/N57 rods are compared to the petrol engines?
P.S. Personally I would not use the UK for the rebuild. Most if not all UK indies are massively overhyped, undeservedley so after trying quite a few of them.
I would ship it over to H2 Motors GmbH in Germany. Rebuilding a long 6 cylinder aluminium block is not straight forward if it's warped as you can't replace the steel main bearing supports.
You'll never get even a brand new crank running true if the block has warped. Hence why most blown N57s get tossed into the bin. Seized main bearings nearly always cause block warpage. Some can be salvaged, some can't.
I would ship it over to H2 Motors GmbH in Germany. Rebuilding a long 6 cylinder aluminium block is not straight forward if it's warped as you can't replace the steel main bearing supports.
You'll never get even a brand new crank running true if the block has warped. Hence why most blown N57s get tossed into the bin. Seized main bearings nearly always cause block warpage. Some can be salvaged, some can't.
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