Recent Topics
Paint Brushes - Home Improvement
by Merkava_4
Yesterday at 11:46 PM
How do you determine the proper HTHS rated oil?
by 79sunrunner
Yesterday at 11:29 PM
Saved a puppy
by barkingspider
Yesterday at 10:39 PM
Slick 50
by CrackyWainwright
Yesterday at 09:28 PM
Bmw twin power 5w30
by BTLew81
Yesterday at 09:08 PM
Older car but low mileage. Change or not?
by Martin10
Yesterday at 08:07 PM
F1 - 2016 Belgian Grand Prix
by gofast182
Yesterday at 07:55 PM
Ethernet card uograde needed?
by NHHEMI
Yesterday at 07:27 PM
2012 Suzuki DL1000 VStrom Oil Recommendations
by RHALL
Yesterday at 07:24 PM
Audio/Micro Adapter Help
by coopns
Yesterday at 07:18 PM
Purolator boss 2222 6,200 miles
by gabriel9766
Yesterday at 06:49 PM
Fram Ultra paint peeling
by Run
Yesterday at 06:26 PM
Newest Members
ShadowSix, warfire, Brutus232, gojoneeded, jimmyangst
58911 Registered Users
Who's Online
37 registered (bbhero, 3800Series, 67baccaruda, Arob, Andy636, Benoit, 2 invisible), 914 Guests and 7 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58911 Members
66 Forums
253517 Topics
4161558 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: 17369
Loc: Iowegia - USA
_________________________
"Never buy flowers from a monk; only YOU can prevent florist friars." Smokey smile


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


Registered: 12/12/02
Posts: 33687
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 Online   content


Registered: 06/09/03
Posts: 1776
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: 33687
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