Recent Topics
Adhesive protective patch in wheelwell
by dlundblad
07/28/16 05:02 AM
My Faith Has Been Restored
by bobbob
07/28/16 02:57 AM
Kohler Courage 15
by Commeres
07/28/16 02:13 AM
Windstar 2001 AC Low and High pressure reading
by pinjc
07/27/16 09:28 PM
Vacuum Pump Oil for rotary vane pumps.
by bunnspecial
07/27/16 09:22 PM
ST dino oil realistic OCI
by OILGEEK27
07/27/16 09:06 PM
Gas grills
by RN89
07/27/16 08:43 PM
Supercharged Subaru BRZ
by clinebarger
07/27/16 07:52 PM
Side can opener ?
by ST2008
07/27/16 07:48 PM
Pennsoil ULTRA not available
by JXW
07/27/16 07:41 PM
2005 Civic randomly stalls when taking off from a
by Avery4
07/27/16 07:36 PM
2003 Saturn L200 oil choice
by car51
07/27/16 07:30 PM
Newest Members
donsladek, rummy, OILGEEK27, pinjc, Lee_C
58627 Registered Users
Who's Online
28 registered (bandz7, 182RG, Bottom_Feeder, 5 invisible), 921 Guests and 12 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58627 Members
66 Forums
252342 Topics
4138700 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#3312352 - 03/14/14 11:23 PM Crankshaft Design
MolaKule Offline


Registered: 06/05/02
Posts: 17332
Loc: Iowegia - USA
_________________________
Life begins at the end of your comfort zone. smile


Top
#3312367 - 03/14/14 11:59 PM Re: Crankshaft Design [Re: MolaKule]
Shannow Online   content


Registered: 12/12/02
Posts: 33497
Loc: Oz
That's a lot of information in a small space, thanks.

Top
#3312379 - 03/15/14 12:22 AM Re: Crankshaft Design [Re: MolaKule]
expat Offline


Registered: 05/12/09
Posts: 5094
Loc: Canada
Thanks for posting.

But to put things in perspective:

Austin Seven two bearing crankshaft:

http://www.a7c.co.uk/parts/BB1photo.jpg

Amazingly they will run 6k rpm

Top
#3312388 - 03/15/14 12:37 AM Re: Crankshaft Design [Re: MolaKule]
edhackett Offline


Registered: 06/09/03
Posts: 1772
Loc: Sequim, WA
Here's Alfa Romeo's take on a 4 cylinder crank from the mid 50's through the end of production of the Alfa designed engines.



Ed
_________________________
Never attribute to engineers that into which politicians, lawyers, accountants, and marketeers have poked their fingers.

Top
#3312418 - 03/15/14 01:46 AM Re: Crankshaft Design [Re: MolaKule]
Shannow Online   content


Registered: 12/12/02
Posts: 33497
Loc: Oz
Quote:
There were some initial problems with bolt-on counterweights, which resulted (as one Formula One designer told me) in "several deep holes being dug in the surface of a few racetracks". There are tensile and fatigue stress issues, as well as the inevitable fretting between contact surfaces and the requirement for highly developed fastener technology.


Having observed more than a couple of high cycle fatigue failures of turbine blades, with horizontal shaft rotating equipment, there is obviously a 2g difference in the centripetal acceleration at 12:00 versus 6:00.

Most of the genuine high cycle fatigue (calc'd at 170x10^6 cycles from crack to failure in most) ones that I've seen have ultimately failed at around 6:00, as evidenced by trajectories and consequential damage.

Top