Rod bearing failure. What now?

[digger]

They grind the corners at the journal meets the crank throw to a round radius to avoid stress-riser leading to crack. Don't see that on older cars.

I haven’t seen a bmw crank without radii in the corners.

[digger]

yeah, I’m in board. I’m going that route. But there are no other cast options out there… only forged. Of those, the most reasonable are the ones I mentioned.

Mahle MS have several alloys though. Avoid 2618 unless it’s a high boost FI. 4032 will do north of 100k comfortably and it’s what most OE forged pistons use

[Obioban]

I guess that makes my comment irrelevant for the most part as I'm sure most people aren't buying BMW pistons and rods for rebuilds.

I would (did) buy BMW pistons/rods. After 20 years of watching 99% of engine builds using aftermarket parts fail, I just have no desire for them at all in my engine internals.

[duracellttu]

Doesn't BMW sell rebuilds for ~15k?

Edit: here ya go: https://parts.bmwnorthwest.com/p/BMW...000304349.html

Honestly, we should all buy one and hoard them. They will be NLA and/or sky rocket in the next 5 years.

[Pklauser]

Honestly, we should all buy one and hoard them. They will be NLA and/or sky rocket in the next 5 years.

Yea but if we all do that it'll be more like the next 5 months 😬

[digger]

I would (did) buy BMW pistons/rods. After 20 years of watching 99% of engine builds using aftermarket parts fail, I just have no desire for them at all in my engine internals.

It amazes me the number of screw ups you see especially when it’s actually a straight forward exercise of buying suitable parts, honing it according to the ring type and running it in.

[GreyM340i]

Honestly, we should all buy one and hoard them. They will be NLA and/or sky rocket in the next 5 years.

I’m pretty sure this is just the short block without the top half. Don't see BMW selling the long block.

[tlow98]

I’m pretty sure this is just the short block without the top half. Don't see BMW selling the long block.

they have a different price for just the short block. Check around, you’ll see.

[bmwfnatic]

Honestly, we should all buy one and hoard them. They will be NLA and/or sky rocket in the next 5 years.

They are building these reman. engines fresh. They aren’t 20 year old stock.

[GreyM340i]

they have a different price for just the short block. Check around, you’ll see.

I used the same part number and most places like ECS and Real OEM call it a short engine. Not sure maybe thats what they call this motor however most other engines they call them short and long blocks.

[bmwfnatic]

I used the same part number and most places like ECS and Real OEM call it a short engine. Not sure maybe thats what they call this motor however most other engines they call them short and long blocks.

It is listed as a short block indeed, but it is basically a complete engine. It comes with the head on, a new vanos, a new water pump, new sensors, and if I remember it right even an oil filter in the housing already. The biggest item it does not come with are the throttle bodies.

[GreyM340i]

It is listed as a short block indeed, but it is basically a complete engine. It comes with the head on, a new vanos, a new water pump, new sensors, and if I remember it right even an oil filter in the housing already. The biggest item it does not come with are the throttle bodies.

That’s pretty cheap if you’re correct. When BMW just rebuilt my whole motor they said a full long lock would be closer to $25k if you can find one from BMW direct.

[bigjae46]

I’m pretty sure this is just the short block without the top half. Don't see BMW selling the long block.

Apparently a short engine is a long block. I can’t think of a way that BMW could make this more confusing. Should be broken engine, engine parts and an engine. Done.🤣

[George Hill]

A BMW "short engine" would traditionally be referred to as a long block, BMW does not sell just a short block (assembled block/crank/pistons).

[ChapterM3]

Doesn't BMW sell rebuilds for ~15k?

Edit: here ya go: https://parts.bmwnorthwest.com/p/BMW...000304349.html

I never knew this site existed until now, thank you for posting!