Recent Topics
Will finding matching headlights and turn signals
by MalfunctionProne
01/30/15 06:21 AM
Water Pump RTV
by supercity
01/30/15 06:21 AM
Quick way to find if a song/album is explicit?
by horse123
01/30/15 05:21 AM
Advance Auto Oil Specials Jan 29-Feb 25 2015
by sopususer
01/30/15 04:58 AM
What Years Are Affected With Those Bad Air Bags?
by crazyoildude
01/29/15 11:33 PM
2014 Mazda 3 - Factory Fill, 8145km
by unknown
01/29/15 11:21 PM
Pushing a clutch slave rod back into the cylinder
by rationull
01/29/15 11:07 PM
I'm streaming Mass Effect
by Nick R
01/29/15 11:00 PM
Second World War 'Black Devils'
by OVERKILL
01/29/15 10:39 PM
Windshield washer fluid smells bad?
by Jimmy9190
01/29/15 10:20 PM
Mixing Oil 5w20 5w30 10w30
by crazyoildude
01/29/15 10:11 PM
Cheap, used 4x4 SUV.
by HM12460
01/29/15 08:46 PM
Newest Members
stephen44, car20022004, just1n020, GTWBoss302, RapidRide2
52665 Registered Users
Who's Online
57 registered (1foxracing, BigCahuna, asand1, 57ChevyLS, Al, 18B, 5 invisible), 752 Guests and 172 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
52665 Members
66 Forums
225762 Topics
3592888 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: 14958
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: 27697
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: 4031
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: 1589
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: 27697
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