m50 with s50 pistons, which conrods??

[M50Power]

hello, i'm building m50b31, i have s50 pistons without conrods, i have m52b28 conrods but it's pin diameter is 22mm and s50 piston pin diameter is 21mm, which conrod can i use except s50 conrods? or can i modify(bore) piston for 22mm pin?

[digger]

should be able to rebush rods if needed to accept smaller pin

[M50Power]

where can i find 21mm bushes?

[acolella76]

You sure you have the right wrist pin? M50/M52/S50/S52 all have the same diameter wrist pin. Or maybe the M52 rods are just extremely worn?

[digger]

i to was under the impression than all pins were 22mm. in anycase any engine builder should be able to press out old bushes and refit and hone a new set

[M50Power]

no s50 pistons have 21mm pin, m52 has 22mm and it's not worn because i had built few engines with m52 pistons & conrods and all of them had 22mm pin

p.s where can i buy 21mm bushes can you give me ebay or amazon link?

[acolella76]

no s50 pistons have 21mm pin, m52 has 22mm and it's not worn because i had built few engines with m52 pistons & conrods and all of them had 22mm pin

p.s where can i buy 21mm bushes can you give me ebay or amazon link?

My engine is currently using S50 wrist pins with M52 rods and S52 pistons. They are all 22mm. Did you perhaps get euro S50 pistons?

Anyway, here's the part number and complete list of applications... http://bmwfans.info/parts-catalog/11241278209/

Should be pretty cheap from the dealer

[digger]

yeah looks like he is in europe so than splains it

[M50Power]

what about boring pistons like this? https://www.youtube.com/watch?v=hL4V2XQhScA

[MclubSport]

Hello. Can I put M50S32 euro specs pistons and roads on M54 crank ?
Anyone tried this? Rods diameter : S50 51mm and M54 48.01 mm ( big side/crank side ). Is it true ? Also the rod from S50B32 has 139mm and M54b30 rod has 135 mm
Now I have M54 crank , pistons and rods in M50 NV block...