Bmw S85 Flat Plane Crank
By the Editorial Staff
March 24, 2026
Our S85 crankshaft repair can turn your spun rod bearing S85 crankshaft back into a good usable crankshaft. We grind down the damaged journals and weld them back up. We then grind the crankshaft back to its original dimensions.
The crankshaft is then heat treated and micro polished. Most crankshafts can be repaired, fo. Is the BMW V8 flat-plane crank? BMW's 4.4-liter V8 doesn't actually have a flat-plane crankshaft, but as we explained back in 2014, it does have a crossover exhaust manifold that sends an evenly.
Building your own flat-plane engine There are many obstacles to building a flat-plane engine. Assuming you can get a custom made flat-plane crank, you still need to get the camshafts to match. Per the thread title, "Accessible Flat Plane Crank V8s", seems the S65 fits.
As you pointed out, they're not cheap, but they're plentiful used and can be had as crate motors. Personally, I'd rather dump the money in keeping it rotary. It doesn't get much more special than that.
With so many S85 lying around in graveyards would there be any potential for someone with time on the hand to recover some of them. Lets assume most of the dead engines have bad crankshafts. What reliable options does one have to replace/repair the cranks: 1.
Grind down, 1 thou, 2 thou? Is any other treatment needed afterwards 2. Get the best deals for Bmw S85 Crank at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!
NEW OEM BMW crankshaft for the V10 engines, BMW part #11217838319 factory 75.2mm stroke. Does NOT come with bearings! BMW S85 Applications: BMW 5 Series 2005-2010 E60/E61 M5 BMW 6 Series 2005-2010 E63/E64 M6. Brand: Adracing Application(s): For BMW E60 M5 M6 S85B50 Crankshaft Engine(s): For BMW S85B50 Material: Billet 4340 Steel Stoker: 75.2mm/custom Main Journal Diameter: 55mm Rod Journal Diameter: 48mm Moq: 1 pc.
The BMW S85B50 is a naturally aspirated V10 petrol engine which replaced the BMW S62 V8 engine in the M5 model and was produced from 2005-2010. It was both BMW's first and only production V10 engine, and the first petrol V10 engine to be available in a production wagon (estate). S85 5.8L Stroked And Bored Engine BMW SKU: CB885-6001 $36,995.00 Split your purchase into installments for orders up to $30,000.00 with.