<VV> Broken Crank!

[jvhroberts at aol.com]

 Iron and steel have approximately the same modulus of elasticity. Fatigue resistance, however, is quite different. And steel has a somewhat lower CTE than cast iron. I think GM chose steel for the fatigue resistance, and, in 1960, there weren't many nodular iron cranks out there (there were some), as the industry was still on a learning curve for this material. 

 

John Roberts
 

 

-----Original Message-----
From: HallGrenn at aol.com
To: BobHelt at aol.com; dnoneal at comcast.net; virtualvairs at corvair.org
Sent: Mon, May 3, 2010 10:35 am
Subject: Re: <VV> Broken Crank!


 
In a message dated 5/3/2010 10:08:04 AM Eastern Daylight Time,  
BobHelt at aol.com writes:

Harmonic  damper  or 
not? Mileage? Car use..racing?  
Thanks,
Regards,
Bob Helt



Bet it didn't have the harmonic dampener.  I thought the Corvair crank  was 
forged steel just because iron was too stiff for the various expansion 
modes  of the engine.
 
Bob Hall
Group Corvair
Corvanatics
CORSA
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