Recent Topics
2010 Tahoe Z71 Oil, etc.
by SteveP
06/27/16 07:59 AM
Olive oil
by Shellman
06/27/16 07:58 AM
Purolator One and Puro Boss 14006 "Not Cut Open"
by bandz7
06/27/16 07:04 AM
Nikola Semi
by AirgunSavant
06/27/16 06:57 AM
Oil Pressure with M1HM 10w30
by lukejo
06/27/16 05:56 AM
Clay Based HTB Grease
by SR5
06/27/16 04:33 AM
Which M1 oils are true synthetics
by FordCapriDriver
06/27/16 04:06 AM
That's unfortunate...or maybe bypass filtration?
by linksep
06/27/16 02:24 AM
Over Oiling
by mjoekingz28
06/27/16 12:59 AM
Sweden Trials Electric Higway for Trucks
by Y_K
06/27/16 12:07 AM
17 yo deutsch filter?
by robo339
06/26/16 11:07 PM
Ford Focus wrecked
by tig1
06/26/16 10:13 PM
Newest Members
karpouzi, Tapan, shindery, Josh_Westwood, Brogan
58283 Registered Users
Who's Online
79 registered (2015_PSD, AirgunSavant, 2009Edge, 2010Civic, 360kid, Asterix, 6 invisible), 1500 Guests and 9 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58283 Members
66 Forums
250863 Topics
4111774 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: 17247
Loc: Iowegia - USA
Somehow your attitude seems to have improved after, but not before, my last cup of coffee. smile

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

Registered: 12/12/02
Posts: 33146
Loc: Oz
That's a lot of information in a small space, thanks.

#3312379 - 03/15/14 12:22 AM Re: Crankshaft Design [Re: MolaKule]
expat Offline

Registered: 05/12/09
Posts: 5083
Loc: Canada
Thanks for posting.

But to put things in perspective:

Austin Seven two bearing crankshaft:

Amazingly they will run 6k rpm

#3312388 - 03/15/14 12:37 AM Re: Crankshaft Design [Re: MolaKule]
edhackett Offline

Registered: 06/09/03
Posts: 1762
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.

Never attribute to engineers that into which politicians, lawyers, accountants, and marketeers have poked their fingers.

#3312418 - 03/15/14 01:46 AM Re: Crankshaft Design [Re: MolaKule]
Shannow Offline

Registered: 12/12/02
Posts: 33146
Loc: Oz
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.