Recent Topics
Oil for Audi A4 3.0
by dlundblad
01/26/15 04:13 PM
Radiator hoses... how many years are they safe?
by mrsilv04
01/26/15 03:52 PM
Snowblower Specific 5W-30 Oil at Menards
by threeputtpar
01/26/15 03:33 PM
Need New Tires - Primacy MXM4 vs. Premier A/S
by The Critic
01/26/15 03:09 PM
Being a parts or service advisor at a dealership.
by Hollow
01/26/15 03:08 PM
2 Gig RAM stick
by Schmoe
01/26/15 03:07 PM
Reducing Rent Payment by Buying a House?
by john_pifer
01/26/15 02:54 PM
Another oil question...
by TLY
01/26/15 02:52 PM
Most miles in a day
by Vikas
01/26/15 02:36 PM
Purolator Pl14612 cut open looks good.
by tratman2000
01/26/15 02:32 PM
Valve damage due to blocked airfilter.
by PierreR
01/26/15 02:27 PM
How long will a filter last filled w/oil?
by Doog
01/26/15 01:20 PM
Newest Members
RollinFury, foxfire, zach1900, goldie2222, Max9219
52613 Registered Users
Who's Online
121 registered (01_celica_gt, aquartlow, 901Memphis, 2009Edge, AandPDan, anl0109, 12 invisible), 1871 Guests and 155 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
52613 Members
66 Forums
225607 Topics
3589153 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: 14946
Loc: Iowegia
_________________________
When I told you I was normal, I may have exaggerated slightly. smile

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


Registered: 12/12/02
Posts: 27676
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: 4023
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: 1588
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: 27676
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