My flywheel has .004" of runout in one small portion of the rim, about 4" long, which I discovered when I put it on a mandrel in the lathe. I placed a dial indicator on the FACE of the rim....on the edge it's fine. How could that be you ask? Well, the machining looks good and upon very close inspection I realized the casting itself was off...warped, whatever...yet it was sent through the machining process anyway and installed in an engine! Personally, I don't think it's much of a problem as the flywheel balances quite well, but I'd like opinions from the group.
By the way, it has the letters "DS" embossed in the cast iron. Was this a Dodge Brothers product? The engine is a crank start 1918. Thanks!
Flywheel runout..........
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George Andreasen
Topic author - Posts: 201
- Joined: Sun Jan 06, 2019 6:21 pm
- First Name: George
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henryford2
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Re: Flywheel runout..........
Here’s my take on your question. Rotating unbalance is the uneven distribution of mass around an axis of rotation. A Model T transmission weighs approx. 75 lbs. (1200 oz.). The uneven distribution .004” x 1200 oz. = 4.8 oz.in. or 5.36 g/mm unbalance. 5.36 g/mm is better than a Balance Quality Grade of G 6.3 (Balance Quality of Rigid Rotors ISO 1940/1) for flywheels. Run it!
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George Andreasen
Topic author - Posts: 201
- Joined: Sun Jan 06, 2019 6:21 pm
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Re: Flywheel runout..........
LOL...........I actually had to read that TWICE, but finally got it! Thank you.
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Adam
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Re: Flywheel runout..........
If you mean .004” indicator runout, then that area is only .002” off center.
What you have is probably fine.
If you want something a little better to start with, get a ‘26-‘27 flywheel. They are machined all over and sometimes are a bit better in balance.
What you have is probably fine.
If you want something a little better to start with, get a ‘26-‘27 flywheel. They are machined all over and sometimes are a bit better in balance.