Recent Topics
AEM Dryflow or OEM
by Joeforester
02/28/17 03:55 AM
MY13 XT Forester Penrite Enviro+ C3 5W30
by mickjf
02/28/17 02:07 AM
4th to reverse
by mjoekingz28
02/28/17 12:41 AM
Mortise lock cylinder help
by boulderdentist
02/28/17 12:15 AM
Very pleased with online seller for filters-
by rubberchicken
02/27/17 11:47 PM
New Lucas Oil Stabilizer High Mileage
by mrfd222
02/27/17 11:38 PM
Oil filter with no bypass valve ?
by rubberchicken
02/27/17 11:10 PM
Gear Oils for a FJ Cruiser
by Nick1994
02/27/17 10:50 PM
275,000 Mile 2005 motor... which oil?
by Goros
02/27/17 09:54 PM
Kitchen cabinet re-lacquer
by spasm3
02/27/17 09:42 PM
2013 Civic Si (K24Z7) Oil for Extended OCI
by cjsiege
02/27/17 09:30 PM
Tax questions?
by maverickfhs
02/27/17 09:17 PM
03 Toyota 4runner 4.0 v6 oil recommendation
by 02s4audi
02/27/17 09:13 PM
10k posts
by sciphi
02/27/17 08:49 PM
Front diff and T case fluid change.
by Rat407
02/27/17 08:28 PM
Cruise control deactivation switch -Grand Marquis
by mercuryblues
02/27/17 08:22 PM
Mobil 1 Annual Protection
by njohnson
02/27/17 07:19 PM
0w 20 or 5w20?
by beckerized
02/27/17 06:57 PM
MC FL-500S, 2014 F-150, 6,000 miles CUT OPEN
by car51
02/27/17 06:55 PM
2006 Odyssey EX-L, 6.5k, much improved with old PP
by SubieRubyRoo
02/27/17 06:45 PM
Newest Members
327, cjsiege, Goros, DieselTech18, Seadub
60671 Registered Users
Who's Online
46 registered (askani79705, BigCahuna, 4WD, bbhero, alarmguy, 7 invisible), 1353 Guests and 13 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
60671 Members
66 Forums
261670 Topics
4317334 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#3312352 - 03/14/14 11:23 PM Crankshaft Design
MolaKule Offline


Registered: 06/05/02
Posts: 17777
Loc: Iowegia - USA
_________________________
To all those who received a book from me for Christmas, they're due back at the library now. You're welcome. smile

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


Registered: 12/12/02
Posts: 35014
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: 5186
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: 1817
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: 35014
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