m20b28 rotating assy pics

[It's Soda Not Pop]

Left r3v for almost 2yr, and no-one wants to talk about the interesting/technical stuff. :(

I sold several installation tools, and am now making bearings from bronze since they have been NLA (outside NOS) for over a year. I really don't forsee BMW making any more, either. Such a small market. :(

https://www.r3vlimited.com/board/for...d#post10055001

yes some of us are still interested in the technical stuff. I don't care how boring you think it might be post all of your knowledge and services.

[Panici]

Agreed, not boring.
People just have shorter attention spans now with the influx of media into every facet of our lives.

[mikey.antonakakis]

Left r3v for almost 2yr, and no-one wants to talk about the interesting/technical stuff. :([/url]

I sure do want to talk about it! But I feel your pain, my build thread is super low engagement. I certainly appreciate the knowledge you've shared over the years!

[dvallis]

Thanks for sharing John. Awesome stuff.

[McGyver]

Left r3v for almost 2yr, and no-one wants to talk about the interesting/technical stuff. :(

I sold several installation tools, and am now making bearings from bronze since they have been NLA (outside NOS) for over a year. I really don't forsee BMW making any more, either. Such a small market. :(

https://www.r3vlimited.com/board/for...d#post10055001

Welcome back! I was gone for about 5 months moving to PA. Once I find a garage/workshop, I'm going to be getting technical with a 2.7i build.

Do your bearings need to be honed in place like the originals?

[ForcedFirebird]

Welcome back! I was gone for about 5 months moving to PA. Once I find a garage/workshop, I'm going to be getting technical with a 2.7i build.

Do your bearings need to be honed in place like the originals?

As of now, yes.

I believe I can attain the accuracy needed for them to be press and go, but feel it's best to hone just a little to dial in. With the stock bearings, I would bore .010" out of them before pressing in, just to lessen the time needed to hone. My bearings are already the size I would turn them to, so there's very little material that needs removed.

[McGyver]

As of now, yes.

I believe I can attain the accuracy needed for them to be press and go, but feel it's best to hone just a little to dial in. With the stock bearings, I would bore .010" out of them before pressing in, just to lessen the time needed to hone. My bearings are already the size I would turn them to, so there's very little material that needs removed.

Depending on BMW's ID clearances vs the needed oil gap tolerance, I guess they'd have to be honed.

[ForcedFirebird]

Depending on BMW's ID clearances vs the needed oil gap tolerance, I guess they'd have to be honed.

Not necessarily. Typically iron pushrod v8's don't need honing, but I just did an LS a couple weeks ago that needed it (ally blocks tend to core shift after heat cycles).

The problem is the tolerance on the m20. Just the process of pressing can distort them enough to bugger things. They are only 2mm thick and you are shooting for a .013mm oil clearance (.0005" per side, or .001" total diameter). Too much and you lose your oil pressure.