Recent Topics
UOA, Pennzoil Platinum 5W30, 15K KM, 10 months
by ST2008
08/26/16 06:19 PM
Cruise control going downhill
by Donald
08/26/16 05:58 PM
O'REILLY SYNTHETIC OIL
by dooscoop32
08/26/16 05:10 PM
Anyone here a ice road truckee?
by car51
08/26/16 04:42 PM
What is business model of UBER ride-hailing co. ?
by HTSS_TR
08/26/16 04:12 PM
Old wall furnace
by Jarlaxle
08/26/16 02:55 PM
automatic side folding mirror squeak
by Grambo
08/26/16 02:11 PM
Anybody own a new Mazda 6?
by AirgunSavant
08/26/16 01:58 PM
Do Employees Of Car Companies Get New Cars Cheap ?
by crazyoildude
08/26/16 01:54 PM
Amsoil SVG 75W90, 50K, 04 Duramax 196K
by dhellman12
08/26/16 01:53 PM
When an orifice is needed & when it is not (long)
by ryaneirich
08/26/16 01:38 PM
UT-Austin Response to CC
by sleddriver
08/26/16 01:36 PM
Newest Members
therhett17, glldprimr, krankshaft, Tony_Rhed, greasemonkey1
58935 Registered Users
Who's Online
91 registered (andrewp1998, 123Saab, 1JZ_E46, Al, AirgunSavant, albertdi, 8 invisible), 1555 Guests and 40 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58935 Members
66 Forums
253592 Topics
4162949 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: 17370
Loc: Iowegia - USA
_________________________
I'll procrastinate tomorrow! smile


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


Registered: 12/12/02
Posts: 33694
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: 5100
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: 1777
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: 33694
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