|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
02-28-2020, 04:01 PM | #1 |
Senior Member
Join Date: May 2017
Location: Arkansas
Posts: 611
|
8BA Crank Grind Size Limits?
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!
|
02-28-2020, 04:14 PM | #2 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,316
|
Re: 8BA Crank Grind Size Limits?
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)?
|
Sponsored Links (Register now to hide all advertisements) |
|
02-28-2020, 04:40 PM | #3 |
Senior Member
Join Date: May 2010
Location: Star, MS
Posts: 4,024
|
Re: 8BA Crank Grind Size Limits?
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.
|
02-28-2020, 04:40 PM | #4 |
Senior Member
Join Date: Jan 2011
Location: sw minnesota
Posts: 4,574
|
Re: 8BA Crank Grind Size Limits?
fred, barnfind 08, has nos cranks. not sure about 8ba style though, ask him
|
02-28-2020, 08:36 PM | #5 |
Senior Member
Join Date: May 2017
Location: Arkansas
Posts: 611
|
Re: 8BA Crank Grind Size Limits?
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.) |
02-29-2020, 09:12 AM | #6 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: 8BA Crank Grind Size Limits?
Sponsored Links (Register now to hide all advertisements)
|
02-29-2020, 03:28 PM | #7 |
Senior Member
Join Date: May 2010
Location: Canada Where it snows
Posts: 2,058
|
Re: 8BA Crank Grind Size Limits?
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 |
02-29-2020, 08:25 PM | #8 |
Senior Member
Join Date: May 2017
Location: Arkansas
Posts: 611
|
Re: 8BA Crank Grind Size Limits?
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.
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|