8BA Crank Grind Size Limits?

[leon bee]

I'm going to go look at a couple crankshafts for my next engine. I'm sure I've read the answers here, but can't find the real scoop right now. Both of em I think have been ground, and will need that again. Mac VP shows both rod and main bearings up to .040 over. C and G shows con rod bearings up to .040, mains up to .030. I can call these guys, but like to know as much as I can. How much can you grind? Thanks everybody!

[tubman]

I have one (3 3/4 stroke) that my builder says should go .010/.010 (maybe .020/.020 at the worst). You can have it for free. What's shipping from Minnesota to Arkansas (in May when I get back)?

[40cpe]

The 4" crank in my 8BA is turned .040" on the rods. I got the bearings from Red's Headers several years ago. I have about 5000 miles on the engine and the oil pressure is the same as when first fired up.

[cas3]

fred, barnfind 08, has nos cranks. not sure about 8ba style though, ask him

[leon bee]

Thanks everybody. These are actually Mercury cranks. I know I don't NEED a Merc crankshaft, I just WANT one. I now have a running 239 and a running 255. Not sure I can tell the difference, but I like to think I can.

Denny you are a generous man..........(my wife says I am, too, give away way too much stuff.)

[Ol' Ron]

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You can actually grind it down to 1.998 and use early floater bearings down to -.040, Get creative You might have to balance the crank after all tis

[Ronnie]

Confirm bearing size with the machine shop before you order bearings. Bearings are under size not oversize. Any machine can order them no problems.


R

[leon bee]

Thanks, Ronnie, we all know what I'm asking about. I'll be taking a micrometer with me when I look at the cranks............just wanna know how far you can go.