Recent Topics
Mazda Miata ridiculous oil change interval
by Baveux
10/21/14 09:48 PM
2 piece engine block on Ford's new 2.7 EcoBoost V6
by gonefishing
10/21/14 09:47 PM
Sears Die Hard Platinum
by StevenR
10/21/14 09:35 PM
2015 VW GTI, one of the best under $30k?
by buster
10/21/14 09:01 PM
Lone wolf strike in Canada?
by DNVDMAX
10/21/14 08:59 PM
Kawasaki 175 Old Enduro Carb set up....Advice ?
by Rudy1999 250
10/21/14 08:53 PM
Low Beams too dim
by BrandonVA
10/21/14 08:48 PM
Bio clean for a slow drain?
by supton
10/21/14 08:10 PM
KIA and Honda 0 or 5/20
by pair of Blazers
10/21/14 07:30 PM
TGMO 0W-20, 9,950 mi on oil, 2012 Elantra GLS,127K
by schuylkill
10/21/14 07:09 PM
Oil wieght for 360 magnum
by pjc360
10/21/14 07:06 PM
Anyone using Cooler master Elite Desktop?
by FirstNissan
10/21/14 06:53 PM
Newest Members
ArtGarcia, 12e, AnonyBliss, Rits, BMEP
51659 Registered Users
Who's Online
105 registered (andyd, actionstan, 901Memphis, -SyN-, 74DartSport, 11 invisible), 1577 Guests and 175 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51659 Members
64 Forums
221033 Topics
3493647 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: 14639
Loc: Midwest
_________________________
My bank has a service where they text me my balance every afternoon. I just don’t think they should add “LOL” to the end. smile

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


Registered: 12/12/02
Posts: 26787
Loc: a prison island
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: 3824
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 Online   content


Registered: 06/09/03
Posts: 1544
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 Offline


Registered: 12/12/02
Posts: 26787
Loc: a prison island
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