My M50B30 Build

[S61Dan]

Hey guys. This build has been in the works for the last 5 months or so and is still ongoing. Decided to build myself an M50B30 stroker from an M50B25NV. Why an NV? Well.... I already had one and my 92 525 is already an NV so why not.... Basis is M50 everything except for M54B30 Crank, Pistons, Rods m52 21.5lb pinkie injectors, supporting software etc etc. Relatively "well known" swap to get a cheap "S50 Clone" So I picked up a rotating assy from a local bmw guy from and got the ball rolling.

The doner: 10/91 MY 92 E34 Auto Sedan. 110k miles


Yoink




Spare ZF320 I snagged for $100 in the back. Has 95k ish miles






Taking head down




Blue alloy pad on a little grinder works wonders








Engine rebuild in a can



Home "hone" job. Bores were in good shape, just needed cleaned up









Ready for bearings. Got QC to sign off


finding bearings for this was a PITA. I needed a certain style and very few sellers actually knew what they had. Ended up getting some from ECS Tuning. Worked great




Measured crank before ordering bearings. Crank was in excellent shape. Makes sense since assy had 50k miles. Plastigauged with new bearings and was spot on. Torqued with new 10.9 grade bolts from Mc.Master Carr. Can't be worse than reusing the old


Difference of M50NV rod/piston and M54B30 rod/piston. M54 top



Was cleaning the rods and something wasn't right..... Bent Rod!! Got with seller and he fedex'd me two replacements. Top Notch guy.




Setup for my "polish" job.




That's it for now, stay tuned!

[wmrcs]

Sick! I was thinking about something like this when I'm sick of my Touring. Are you adding boost and I missed it? Tuned in!

[S61Dan]

As of right now, no. This is a daily and I drive 300 miles a week. I want to keep it pretty mild.

[E38740iMD]

subbed

[wmrcs]

As of right now, no. This is a daily and I drive 300 miles a week. I want to keep it pretty mild.

Heheh a turbo can be mild... 😎 Dang, 300 miles?

[S61Dan]

Heheh a turbo can be mild...  Dang, 300 miles?

Yeah, it sucks. Just trying to keep it simple haha

[E38740iMD]

i may do this and if the m30 goes up

[AFJm3]

Sweet!

[Sam Son]

very cool. can't wait to see the finished product

[S61Dan]

Dropped the head off at the machine shop to get cut. Hope he doesn't take much off

[S61Dan]

Got the head back from the machine shop. Cut 6 thou off or something. Not bad. Stuffed the valve seals in and managed to get the valves lapped














Found a cracked retainer too.

[kouks]

Nice!

[S61Dan]

So, I did some more work on this build. Spare time is few and far between! Got the head 99% complete. Got valves all done, aside from the one that I still need a retainer for... Also, worked on the bottom end a little bit, got the piston rings sorted, and got the pistons/rods installed. Very happy to get the rotating stuff done.

[E38740iMD]

My eyes are happy

[S61Dan]

Haha thanks, it's slow going but I think I am over the hump now.

[Mendozart]

Man, this is good stuff! Subbed.

[BleedsBlue]

Cool to see, Dan. More torque in this chassis ist gude.

[E38740iMD]

More torque? Where the m30?




I kid

[S61Dan]

Did some small things on this build recently over the holiday break. Cleaned and sorted a lot of hardware/ engine components. My Dad is building an M54B30 for his E39 530 sport atm so there is engine parts everywhere! Managed to clean, check torque on the pump nut and weld it to prevent it from backing off. Installed the pump and chain as well. Ordered new timing guides/tensioners since I really should anyway so waiting on them.







More to come

[sbeckman7]

This is awesome! Definitely in for updates What a nice surprise to see how much smaller those M54 pistons are over their predecessors. So you will effectively end up with a non-vanos M54B30 running OBDI eh? Similar to what some of the 7 and 8 series guys do with the V12's

Curious about your dad's build M54 as well. What's going on there?

[S61Dan]

This is awesome! Definitely in for updates What a nice surprise to see how much smaller those M54 pistons are over their predecessors. So you will effectively end up with a non-vanos M54B30 running OBDI eh? Similar to what some of the 7 and 8 series guys do with the V12's

Curious about your dad's build M54 as well. What's going on there?

Ehhh it's more of an s50b30 only NV. I will be running Miller WAR to tune it. The M54b30 for the E39 is just a rebuild. The HG blew and being an M54 it destroyed the threads for the headbolts in the block. He used Timeserts to repair it and is just about ready to drop it in. Car has 100k on it and is retarded clean

[TGreene]

My favorite kind of thread. Frankensteining engines and doing it by yourself at home is always the coolest thread.

[S61Dan]

My favorite kind of thread. Frankensteining engines and doing it by yourself at home is always the coolest thread.

Thanks for the kind words. All of this is done at home aside from the head getting cut at the machine shop lol

[atl530i]

Very cool.

[S61Dan]

Another Update: Installed the new timing guides with the old chain. Slapped the timing cover on with all new seals and installed the new water pump. Starting to look like something...