Recent Topics
GATES vs DAYCO for radiator hoses
by Merkava_4
07/29/15 08:25 PM
stolen license plates
by fisher83
07/29/15 08:25 PM
converted the vette from 1157 to 3157
by turtlevette
07/29/15 08:03 PM
08 ford fusion 2.3, m1ep 5w20, 10k oci
by VTAK
07/29/15 07:43 PM
Napa Gold Ratings
by Rojack
07/29/15 07:39 PM
02 acura rsx type s, amsoil ss 5w30, 10K& counting
by VTAK
07/29/15 07:25 PM
Advance Auto Parts Oil Special Scam
by oilpsi2high
07/29/15 06:10 PM
2014 Charger SRT-8
by OVERKILL
07/29/15 05:27 PM
Anyone here make their own homemade bread?
by car51
07/29/15 05:23 PM
Review: 2015 Dodge Challenger R/T 392
by R2d2
07/29/15 05:15 PM
Toyota Venza
by 007
07/29/15 05:05 PM
how to plumbair compressor to pre-existing tank?
by leroyd92
07/29/15 05:02 PM
Newest Members
hackn3y, Macher, lallaland, Jordanw6, thebradens3
54874 Registered Users
Who's Online
124 registered (2010_FX4, 209paulc, aquariuscsm, 901Memphis, 1983zsled, andyd, 11 invisible), 1700 Guests and 107 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
54874 Members
66 Forums
235079 Topics
3781524 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: 15676
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 Online   content


Registered: 12/12/02
Posts: 29458
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 Online   content


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 Online   content


Registered: 12/12/02
Posts: 29458
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