Recent Topics
following the users manual
by barkingspider
07/24/14 02:38 PM
Just got the General Altimax RT43s installed
by mcrn
07/24/14 02:14 PM
GM issues 6 new recalls.
by dave1251
07/24/14 01:08 PM
Crashed Air Algerie plane in Mali Desert.
by dave1251
07/24/14 01:01 PM
OUCH!!
by Oldmoparguy1
07/24/14 12:42 PM
Magnetic oil drain plugs
by Hudson
07/24/14 12:24 PM
Always read seller reviews
by dlundblad
07/24/14 12:17 PM
Car Loan Refinance Rates
by 99Saturn
07/24/14 12:05 PM
Help Identifying Device
by coopns
07/24/14 11:53 AM
Towing boat with Dodge Caravan
by fisher83
07/24/14 10:57 AM
Amsoil's 5W-40 European Oil (EFM) for a BMW 328xi
by Dave13
07/24/14 10:49 AM
Mann ML 1005 another Purolator?
by 123Saab
07/24/14 10:45 AM
Newest Members
XJSteve, joehupp, BwanaBob, gt40p, jsfalls
50743 Registered Users
Who's Online
93 registered (05LGTLtd, 2010_FX4, AandPDan, 97f150, 13 invisible), 2162 Guests and 228 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
50743 Members
64 Forums
216729 Topics
3411265 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: 14034
Loc: Midwest
_________________________
I told a chemistry joke....there was no reaction. smile

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


Registered: 12/12/02
Posts: 26042
Loc: a prison 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: 3734
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: 1495
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: 26042
Loc: a prison 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