|
Sponsored Links (Register now to hide all advertisements) |
|
![]() |
![]() |
Thread Tools | Display Modes |
![]() |
#1 |
Junior Member
Join Date: Aug 2012
Location: Little Rock
Posts: 24
|
![]()
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?
![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
Join Date: May 2010
Location: Wisconsin, USA
Posts: 9,081
|
![]()
Yes. I would definitly check it carefully before you decide to use it. In the meantime, stand it up!
__________________
"I can explain it for you. However, I can't understand it for you". |
![]() |
![]() |
Sponsored Links (Register now to hide all advertisements) |
|
![]() |
#3 |
Junior Member
Join Date: May 2015
Location: ME/FL
Posts: 21
|
![]()
agreed, there is truth to this, if it is not properly supported while being stored horizontally.
|
![]() |
![]() |
![]() |
#4 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
![]()
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.
|
![]() |
![]() |
![]() |
#5 |
Senior Member
Join Date: May 2010
Location: SLC Utah
Posts: 802
|
![]()
I'm concerned now... Will climate change bend my crank?
__________________
RIP Tyler... My Son, Helper & Best Friend. Feb '78 to Father's Day '10. www.97-express.com ~ [email protected] |
![]() |
![]() |
![]() |
#6 |
Senior Member
Join Date: Jul 2013
Location: Sacramento, CA
Posts: 368
|
![]() Sponsored Links (Register now to hide all advertisements)
Last edited by rheltzel; 05-31-2015 at 05:10 PM. Reason: missing word |
![]() |
![]() |
![]() |
#7 |
Junior Member
Join Date: Aug 2012
Location: Little Rock
Posts: 24
|
![]()
Well OK then. I will rotate the box 180* and wait another couple of years. If it is sagging this should fix it.
|
![]() |
![]() |
![]() |
#8 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 11,046
|
![]()
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? |
![]() |
![]() |
![]() |
#9 |
Junior Member
Join Date: May 2015
Location: ME/FL
Posts: 21
|
![]()
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.
|
![]() |
![]() |
![]() |
#10 |
Senior Member
Join Date: May 2010
Location: Florence Ma.
Posts: 2,404
|
![]() |
![]() |
![]() |
![]() |
#11 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
![]()
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.
![]()
__________________
Prof. Henry (The Roaming Gnome) ![]() "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
![]() |
![]() |
![]() |
#12 |
Senior Member
Join Date: Jul 2011
Location: SF Bay Area
Posts: 6,685
|
![]()
fify
__________________
Alan |
![]() |
![]() |
![]() |
#13 |
Senior Member
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,135
|
![]()
I had to look that one up, Alan. DD
|
![]() |
![]() |
![]() |
#14 |
Senior Member
Join Date: Jul 2011
Location: SF Bay Area
Posts: 6,685
|
![]()
__________________
Alan |
![]() |
![]() |
![]() |
#15 |
Senior Member
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,135
|
![]()
I got 'er figured-out......had just never seen that one before. What the heck do I know? DD
|
![]() |
![]() |
![]() |
#16 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,448
|
![]()
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!
|
![]() |
![]() |
![]() |
#17 |
Senior Member
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,135
|
![]()
Soooo, are ya saying cranks don't twist with each firing impulse? There's a difference between "bend", "twist" and "yield point". You ever think about what a harmonic balancer does in conjunction with a crank? DD
|
![]() |
![]() |
![]() |
#18 | |
Senior Member
Join Date: Sep 2013
Posts: 3,008
|
![]() Quote:
Perhaps it the tab was over a foot then with time it could sag under its weight, and long distance to its connection to the shaft! |
|
![]() |
![]() |
![]() |
#19 | |
Senior Member
Join Date: Mar 2015
Location: woodland Ca
Posts: 333
|
![]() Quote:
__________________
Alive n kickin n mostly kickin! |
|
![]() |
![]() |
![]() |
#20 |
Senior Member
Join Date: Jul 2013
Location: Sacramento, CA
Posts: 368
|
![]()
Molly Cules...she worked at the cafeteria next to the crankshaft foundry at the Rouge plant. Was said to have inspired the workers to make sure their crankshafts were always straight, even if they were laid flat.
|
![]() |
![]() |
![]() |
Thread Tools | |
Display Modes | |
|
|
Sponsored Links (Register now to hide all advertisements) |
|