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12-11-2020, 01:52 AM | #21 |
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Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,351
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Re: Diamond B question.
Down side is the rear flange the flywheel mounts to doesn’t have as much meat as the A crank. I suppose , because the flywheels were getting lighter as the roads got smoother. I was behind a friend when his flywheel flange sheared off. I don’t know if he was running a stock A flywheel, or a cut down.
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12-11-2020, 08:47 AM | #22 |
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Join Date: Dec 2019
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Re: Diamond B question.
Flange's do fail. I will measure tonight against an A, will post the difference. I modify for better performance but don't race. In fact I'm quite happy with the power my modified flathead A puts out ( basically double of stock using my seat of the pants dyno), just want the long distance touring capability the B offers, I don't chase the dragon...yet .Plan on using a stock B flywheel behind the C crank and use modern fasteners with loctite to retain the flywheel. No lightened flywheel for this engine, want the mass for smooth drivability.
For racing(someday I might bump my head) I do have a late B that was bored to 4.060 and has balanced rods. I also have a 31 A block bored to .125 fitted with a beavertail A crank. The A block would get the lightest flywheel I could find, make a hillclimber..using the lightest rotating group I can muster insures fast application of torque, It might not last but will be fun while it does. |
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12-13-2020, 02:31 AM | #23 |
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Join Date: May 2010
Location: South California
Posts: 6,188
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Re: Diamond B question.
A lot of the twisted off crank tails has to do with the crank radius being made too small.
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12-13-2020, 11:26 AM | #24 | |
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Re: Diamond B question.
Quote:
counterbalanced ford 'C' crankshaft flange : .3875 |
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12-13-2020, 11:53 AM | #25 |
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Join Date: Aug 2019
Location: Hagerstown MD
Posts: 224
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Re: Diamond B question.
This as any good machinist knows. Sharp edge makes a fatigue point that WILL cause a failure.
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Building a '29 Speedster, the hard way... |
12-13-2020, 12:21 PM | #26 |
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Join Date: Jun 2010
Location: 34.22 N 118.36 W
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Re: Diamond B question.
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Once you have seen a flange broken off the crank, and the lack of material you will really start to wonder. Now, there is quite the debate on putting the Chev 2 pc seal into the Mod"B"/"C" cranks. Just as many different ways of doing it also but, to reduce the likelyhood of breaking off the flange the only way is to fill weld up the slinger area and remachine for the seal. Reducing the flywheel weight does take a lot of stress off the flange, especially if you are revving the motor up. John
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As Carroll Smith wrote; All Failures are Human in Origin. |
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