Recent Topics
Toyota Sienna vs. Traverse vs. ? for family of 6
by deanm11
17 minutes 16 seconds ago
1994 Pontiac Grand Prix 3.1 L - Oil recommendation
by Galantboy
52 minutes 2 seconds ago
Torque Adapter?
by Quattro Pete
Today at 02:25 PM
Oil temperature?
by kjbock
Today at 01:56 PM
LJ 4 Driver
by redhat
Today at 01:41 PM
Fresh Oil Smells like Aftershave
by tc1446
Today at 01:18 PM
You got a flat tire dude!
by y_p_w
Today at 01:05 PM
81 Fairmont valvetrain pics
by Jakegday
Today at 12:56 PM
Knee issues from bike riding?
by sleddriver
Today at 12:46 PM
Moving MS Office to a new SSD?
by ClutchDisc
Today at 11:46 AM
At auction where I got mine 1996 Lexus ES 300 114k
by clarkflower
Today at 11:29 AM
Will Hayden arrested again.
by dave1251
Today at 10:50 AM
Newest Members
lilmoonee, rayzn1123, EricWalls, mikejanczak, 1972
51112 Registered Users
Who's Online
108 registered (01_celica_gt, 29662, 05LGTLtd, 01rangerxl, 3800Series, 123Saab, 10 invisible), 1912 Guests and 223 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51112 Members
64 Forums
218367 Topics
3443017 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: 14374
Loc: Midwest
_________________________
If you fall, I'll always be there. Sincerely...Floor! smile

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


Registered: 12/12/02
Posts: 26298
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: 3795
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: 1514
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: 26298
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