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Old 06-25-2020, 01:17 AM   #1
updraught
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Default Crank grinding

From facebook. Hope this works. Offset grinding videos in case anyone wondered how it's done.
https://www.facebook.com/1443536485/...23529935823533
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Old 06-25-2020, 01:48 AM   #2
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Default Re: Crank grinding

I've stood there and watched it done. It all makes sense but looks wrong!
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Old 06-25-2020, 10:49 AM   #3
BRENT in 10-uh-C
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Default Re: Crank grinding

I'm sure glad my grinder does not take up that much real estate!! That is a nice machine but definitely a 'big boy'!

Fun to watch that Arnold gage bounce. Taking off 0.125 from one side definitely will put it under the heat treating. I wonder if they will Nitride it again after it is ground??
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Old 06-25-2020, 03:15 PM   #4
Flathead
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Default Re: Crank grinding

I doubt that old Merc. had any bells and whistles from Ford.
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Old 06-25-2020, 06:20 PM   #5
Russ/40
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Default Re: Crank grinding

Why is this in the "A" forum? Who is going to offset grind an "A" crank?
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Old 06-25-2020, 06:48 PM   #6
Synchro909
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Default Re: Crank grinding

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Quote:
Originally Posted by Russ/40 View Post
Why is this in the "A" forum? Who is going to offset grind an "A" crank?
No one in their right mind would stroke an A crankshaft but I've heard of it being done on a B crank.
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Old 06-25-2020, 07:28 PM   #7
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Default Re: Crank grinding

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Originally Posted by Synchro909 View Post
No one in their right mind would stroke an A crankshaft but I've heard of it being done on a B crank.
Yep, seen a few nice 2 and 3 piece models........

I think the intention was to show how a crank is ground properly, offset or not.

J
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Old 06-25-2020, 11:15 PM   #8
updraught
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Default Re: Crank grinding

Quote:
Originally Posted by Russ/40 View Post
Why is this in the "A" forum? Who is going to offset grind an "A" crank?

OK. Here is one for the purists.
https://www.youtube.com/watch?v=-7Al...ature=youtu.be
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Old 06-27-2020, 11:43 AM   #9
J and M Machine
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Updraught: Thanks for posting my video. I get lots of calls from people that view it. Along with other machine shops asking how to straighten cranks, someone is watching it.
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Old 06-27-2020, 12:38 PM   #10
Jim Brierley
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Default Re: Crank grinding

Many Model B's were raced back in the day with a 4.062" (+3/16") bore and a 4 3/8" crank (3/16" added stroke) for 239 CID, same as a 38-48 V8. In case you are wondering, such a banger, with an OHV or OHC conversion would crap all over the best of the V8's. I ran my Cook with only a 4" bore, stock stroke, Model B on the track against a herd of big flathead V8's and one 292 CID GMC. The Jimmy had been in the Fast Car Dash for 5 weeks in a row, my Cook could easily stay with him on the straights. Our car was new, as was the driver so couldn't stay with him through the corners, but made more noise than any other car on the track. Most cars were '32 coupes, as was ours.
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Old 06-27-2020, 03:36 PM   #11
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Default Re: Crank grinding

I ran a 235 ci flathead B in a vintage circle track roadster for 2 seasons. Pulled it, put it in my 2 door and ran hill climbs one season. Never had any problems with it. Sold it and last heard it was in some museum sitting in a 20's vintage sprint car.
Jim Brierely ran the clocks that timed it at a couple of hill climbs.
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Old 06-28-2020, 11:33 AM   #12
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I mis-wrote, they ran with 3/8" added stroke, 3/16" per side. Pete's tudor really ran strong! The secret to long crank life is to have large radii at the journals.
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Old 06-28-2020, 12:40 PM   #13
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I mis-wrote, they ran with 3/8" added stroke, 3/16" per side. Pete's tudor really ran strong! The secret to long crank life is to have large radii at the journals.
Large radii are one thing but the 12 lb. damper and 22 lb. clutch/flywheel assembly sure didn't hurt.
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