The Ford Barn

katy · 11-26-2022, 10:27 AM

Were the original crankshafts cast or forged?

Fullraceflathead · 11-26-2022, 11:19 AM

Forged you can see the process in some of the early rouge plant footage

katy · 11-26-2022, 12:19 PM

Thanks

Jim Brierley · 11-26-2022, 12:33 PM

All T, A, B, C and V8 cranks to about 1934 (?) were forged.

Bob Bidonde · 11-26-2022, 12:45 PM

The good news is forgings are very strong with superior fatigue life due to their continuous micro grain structure. The bad news is machining a forging ruins its grain structure continuity which causes stress risers and reduced fatigue life. Castings are typically not as durable as forgings, but grain structures are not an issue in castings.
Castings allow more complex shapes which makes them less expensive to manufacture. However, metallurgy plays a larger role in the ruggedness of castings.

Kurt in NJ · 11-26-2022, 01:08 PM

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the early crankshafts are forged, later cast out of heat treated EE steel , the blueprint has a note that the forged crankshaft is machined to the tolerance as the cast

BRENT in 10-uh-C · 11-27-2022, 08:48 AM

Quote:

Originally Posted by Kurt in NJ

the early crankshafts are forged, later cast out of heat treated EE steel , the blueprint has a note that the forged crankshaft is machined to the tolerance as the cast

Hmmm Kurt, I'm not sure that is what that is saying. I read it to say that on that particular print, all dimensions on this revision are to be the same as what is found on A-6303-A1 and 6303-A2 Forgings drawings. I don't read that comment to say this is not a forging but only to say that the machining department needs to refer to all previous prints in case of a question or discrepancy.

Additionally, because this drawing was just a final clean-up of other revision drawings, you would need to refer back to EI #s 12200 and 17014 to find what changes were being made.
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11-26-2022, 10:27 AM	#1
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,046	Original Model a crankshaft material Were the original crankshafts cast or forged? __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn! Last edited by katy; 11-26-2022 at 10:28 AM. Reason: Correction

11-26-2022, 11:19 AM	#2
Fullraceflathead Senior Member Join Date: May 2012 Location: Chillicothe, Missouri Posts: 1,178	Re: Original Model a crankshaft material Forged you can see the process in some of the early rouge plant footage __________________ "If I asked people what they wanted they would have said faster horses." -Henry Ford "Primitive technology is not a design flaw" 1928 Ford Model A Roadster Pickup 1930 Gordon Smith Air Compressor 1941 Willy's Pickup 1960 Thunderbird-For Sale 1964 Buick Riviera 2x4 425 1965 Pontiac GTO, 455 Super Duty 2004 Dodge Ram SRT-10, V-10 Viper 1977 Charger Jet Boat,460 Ford,Jacuzzi Jet Front Engine Nostalgia Dragster,Supercharged 296 "Fullrace Flathead" Ford Engine Build up on DVD ask

11-26-2022, 12:19 PM	#3
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,046	Re: Original Model a crankshaft material Thanks __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

11-26-2022, 12:33 PM	#4
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,092	Re: Original Model a crankshaft material All T, A, B, C and V8 cranks to about 1934 (?) were forged.

11-26-2022, 12:45 PM	#5
Bob Bidonde Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 3,472	Re: Original Model a crankshaft material The good news is forgings are very strong with superior fatigue life due to their continuous micro grain structure. The bad news is machining a forging ruins its grain structure continuity which causes stress risers and reduced fatigue life. Castings are typically not as durable as forgings, but grain structures are not an issue in castings. Castings allow more complex shapes which makes them less expensive to manufacture. However, metallurgy plays a larger role in the ruggedness of castings. __________________ Bob Bidonde Last edited by Bob Bidonde; 11-27-2022 at 10:28 AM.

11-26-2022, 01:08 PM	#6
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,159	Re: Original Model a crankshaft material Sponsored Links (Register now to hide all advertisements) the early crankshafts are forged, later cast out of heat treated EE steel , the blueprint has a note that the forged crankshaft is machined to the tolerance as the cast