Recent Topics
B2300 tuneup; things that make you say hmmmmm.
by simple_gifts
07/22/14 01:51 PM
online tool for drilling templates?
by dwcopple
07/22/14 01:42 PM
Motorcraft CAF from Walmart
by Whimsey
07/22/14 11:54 AM
F1 - 2014 Hungarian Grand Prix
by gofast182
07/22/14 11:44 AM
My wife's "new" BMW!
by Patman
07/22/14 11:39 AM
VOA for Pennzoil Ultra Platinum?
by Pajero
07/22/14 11:35 AM
New fully synthetic filter media - Mahle
by route66mike
07/22/14 11:35 AM
RJ Reynolds ordered to pay Robinson $25 billion
by OVERKILL
07/22/14 10:08 AM
My Oil Choices delivering pizzas
by AvoidTheNoid
07/22/14 09:41 AM
gas & diesel now only 10 cents apart
by Donald
07/22/14 09:37 AM
Complete Redline Synthetic Harley Oil/Fluid Change
by Climb14er
07/22/14 09:11 AM
spraying fluid film
by buck91
07/22/14 08:51 AM
Newest Members
Iroll, CMTG, Kneedragger37, Constantly, jimmy69stebbins
50712 Registered Users
Who's Online
119 registered (05LGTLtd, 901Memphis, 2010_FX4, 29662, 57ChevyLS, 13 invisible), 2067 Guests and 220 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
50712 Members
64 Forums
216632 Topics
3409139 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: 14014
Loc: Midwest
_________________________
We're all mature until someone pulls out bubblewrap and starts popping it! smile

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


Registered: 12/12/02
Posts: 26025
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: 3728
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: 1492
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: 26025
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