Recent Topics
Annuity Investment - What Options are There?
by ZeeOSix
07/29/15 01:51 AM
Replacement oil filter seals ?
by Merkava_4
07/29/15 01:00 AM
Best oil for long term storage (car, not oil)
by Popsy
07/29/15 12:40 AM
2015 Laguna Seca WSB Picture Show... part 1
by BusyLittleShop
07/28/15 11:38 PM
Plan for My Engine's Longevity - Please Critique
by tjdean01
07/28/15 11:24 PM
Anyone going to try Ravenol 0w16?
by Klutch9
07/28/15 10:28 PM
Chinese-built Volvo Will Come to US
by HTSS_TR
07/28/15 10:03 PM
El Salador Pictures
by donnyj08
07/28/15 09:42 PM
$10 SOPUS Coupon on PP & PPHM @ Autozone
by Nyogtha
07/28/15 09:20 PM
How Thin Can it go ?
by MrJhynx
07/28/15 09:08 PM
Plan 'B' for bleeders when Blaster and time fail?
by mrsilv04
07/28/15 08:59 PM
G-05 in a 2005 Nissan
by KeithS_NW_Ohio
07/28/15 08:49 PM
Newest Members
Scast, bronco79, Everrocking, doc4bax, trailhauler74
54866 Registered Users
Who's Online
31 registered (azsynthetic, akela, 901Memphis, Bandito440, alcyon, 4 invisible), 638 Guests and 80 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
54866 Members
66 Forums
235026 Topics
3780457 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: 15675
Loc: Iowegia - USA
_________________________
I am only one step away from being rich. All I need now is money. smile

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


Registered: 12/12/02
Posts: 29439
Loc: a prisoner 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: 4411
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: 1644
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: 29439
Loc: a prisoner 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