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05-31-2015, 04:06 PM | #1 |
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Gravity bends a crank?
I had my crank reground 4 or 5 years ago and put it in a box to store it. the box is resting on the floor and the crank inside is parallel to the floor. Is there any truth that all crankshafts should be store vertically?
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05-31-2015, 04:09 PM | #2 |
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Re: Gravity bends a crank?
Yes. I would definitly check it carefully before you decide to use it. In the meantime, stand it up!
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05-31-2015, 04:11 PM | #3 |
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Re: Gravity bends a crank?
agreed, there is truth to this, if it is not properly supported while being stored horizontally.
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05-31-2015, 04:22 PM | #4 |
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Re: Gravity bends a crank?
This is one of the topics that there is little agreement on, but most believe that the sagging crank theory is a myth. Easy enough to check, run a gauge on it and see what you have.
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05-31-2015, 04:32 PM | #5 |
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Re: Gravity bends a crank?
I'm concerned now... Will climate change bend my crank?
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06-01-2015, 07:25 AM | #6 |
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Re: Gravity bends a crank?
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06-01-2015, 07:52 AM | #7 |
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Re: Gravity bends a crank?
A previous contribution had stated the steel cranks "sag" before cast iron cranks. I was merely pointing out the opposite is more likely. So, to make this very(I hope) clear. First there is no sag. Second the cast iron is less apt even if you believe sag exists in the Flathead cranks.
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04-22-2016, 02:57 PM | #8 |
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Re: Gravity bends a crank?
Climate change encompasses too wide a collection of scenarios. Now magnetic pole flip, that will cause spontaneous separation of the molecular bonds, you will need to cryo and heat treat the crank when that happens
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04-22-2016, 03:15 PM | #9 |
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Re: Gravity bends a crank?
Just you wait. That tidbit will be released to bring car guys into the fold.
"Nowwww letmebeclear. Ahhh, climatechange ahhhh, willbendyourcrank ahhh burnupyourcoil and ahhh ruinyourshocks. Thedebate ahhh isover!"
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05-31-2015, 05:09 PM | #10 |
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Re: Gravity bends a crank?
No, but if global warming causes the seas to rise enough to flood Salt Lake City, it will rust.
Last edited by rheltzel; 05-31-2015 at 05:10 PM. Reason: missing word |
05-31-2015, 05:18 PM | #11 |
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Re: Gravity bends a crank?
Well OK then. I will rotate the box 180* and wait another couple of years. If it is sagging this should fix it.
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05-31-2015, 05:28 PM | #12 |
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Re: Gravity bends a crank?
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05-31-2015, 05:37 PM | #13 |
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Re: Gravity bends a crank?
I would think that if gravity bends a crank laying on its side too long that standing it on end too long will cause its diameter to spread. . . kinda like my diameter has spread from standing on my end too many years.
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05-31-2015, 05:55 PM | #14 |
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Re: Gravity bends a crank?
fify
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05-31-2015, 05:19 PM | #15 |
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Re: Gravity bends a crank?
Uncle max, The coefficient of thermal expansion of steel is such that unless the extreme temperature is sustained, thereby not permitting the crank to return to its nominal size, the distortion will remain. At least that's my view.
Think of a rail road track expanding during summer and contracting during winter. I just realized you are joking? |
05-31-2015, 05:22 PM | #16 |
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Re: Gravity bends a crank?
on larger (non-automotive) engines, you have jacking gear to turn them over slowly after they have been sitting for a while to remove any distortion from gravity, and this is a crank that is supported. no doubt in my mind that same doesn't happen to an unsupported one. the question becomes what is tolerable. may never even notice it? i can't answer that. but i have to believe that there is measurable change there. if it were a 9000 rpm racing engine, there is probably something to be worried about. these engines, maybe not.
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05-31-2015, 06:03 PM | #17 |
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Re: Gravity bends a crank?
I had to look that one up, Alan. DD
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05-31-2015, 06:06 PM | #18 |
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Re: Gravity bends a crank?
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05-31-2015, 06:08 PM | #19 |
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Re: Gravity bends a crank?
I got 'er figured-out......had just never seen that one before. What the heck do I know? DD
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05-31-2015, 06:09 PM | #20 |
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Re: Gravity bends a crank?
I have always been amazed at discussions like this. Here's a crankshaft that can take the firing impulses running in an engine for 90-100K miles, and some prople wwill think it will bend sitting on a floor? Give me a break!
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