My LCI - is it all in my head

AHall · 09-01-2021, 08:31 AM

Quote:

Originally Posted by e92hunter

It seems that BMW changed the part number for the F90 shortblock and added “LDS coating” for the LCI cars. This is in line with the S58 having LDS coating. I don’t know why it wouldn’t be announced though. Here’s a better explanation from Holdax :

“Looked up the S63 engines at realoem.com and the older and newer short engines have different parts numbers.
From 7/2019 it says its LDS coated meaning most likely means its the cylinder bores and probably the cast aluminum block material is changed too.
It's probably the same stuff as in other newer engines like the S58 ect.

Also the pistons and some crank bearings have different parts numbers they're maybe more changes but thats what i could see at quick glance.”

Sounds like improvements.

wesleyan92 · 09-02-2021, 06:52 AM

Quote:

Originally Posted by e92hunter

It seems that BMW changed the part number for the F90 shortblock and added “LDS coating” for the LCI cars. This is in line with the S58 having LDS coating. I don’t know why it wouldn’t be announced though. Here’s a better explanation from Holdax :

“Looked up the S63 engines at realoem.com and the older and newer short engines have different parts numbers.
From 7/2019 it says its LDS coated meaning most likely means its the cylinder bores and probably the cast aluminum block material is changed too.
It's probably the same stuff as in other newer engines like the S58 ect.

Also the pistons and some crank bearings have different parts numbers they're maybe more changes but thats what i could see at quick glance.”

To a newbie, this is unrecognizable chatter

I don't get it. What are the benefits of this change?

AHall · 09-02-2021, 07:55 AM

Quote:

Originally Posted by wesleyan92

Quote:

Originally Posted by e92hunter

It seems that BMW changed the part number for the F90 shortblock and added “LDS coating” for the LCI cars. This is in line with the S58 having LDS coating. I don’t know why it wouldn’t be announced though. Here’s a better explanation from Holdax :

“Looked up the S63 engines at realoem.com and the older and newer short engines have different parts numbers.
From 7/2019 it says its LDS coated meaning most likely means its the cylinder bores and probably the cast aluminum block material is changed too.
It's probably the same stuff as in other newer engines like the S58 ect.

Also the pistons and some crank bearings have different parts numbers they're maybe more changes but thats what i could see at quick glance.”

To a newbie, this is unrecognizable chatter

I don't get it. What are the benefits of this change?

Combustion chambers are coated with iron so much stronger and resistant to scoring which leads to oil intrusion into the combustion chamber. So you gain some benefits of cast iron block without the weight. It is not clear what changes were made to pistons, rods, crank. Hopefully all are forged.