<VV> Nitride Coating Thickness

[jvhroberts at aol.com]

1. It's not a coating, it's a chemical modification of the surface layer. 
2. The nitriding depth should be about what you said, 0.015 to 0.020 inches. 

CLEARLY it helps reduce fatigue failure of these cranks. 

See: 
http://en.wikipedia.org/wiki/Nitriding
http://www.treatallmetals.com/nitrid.htm


 

 

John Roberts
 

 

-----Original Message-----
From: djtcz--- via VirtualVairs <virtualvairs at corvair.org>
To: corvair <virtualvairs at corvair.org>
Sent: Sat, May 10, 2014 12:43 pm
Subject: Re: <VV> Nitride Coating Thickness



original message- 
Date: Thu, 8 May 2014 08:02:58 -0400 (EDT) 
From: Shelrockbored at aol.com 

Subject: Nitride Coating Thickness 

How thick is the Nitride coating on the crank of a turbo engine? 

Is it .015 - .020? 

Steve Sassi 
LI Corvari 
====================================================== 

I think that is off by at least one decimal for the factory TuffTriding. 

The Chevy Power book and others used to warn that more than gentle polishing 
would remove the very hard surface case. There is a still beneficial fatigue 
resistant layer of compressive stressed material a bit deeper. I'm pretty Any 
regrind returns it to base metal in the hardest working regions. 
If the regrind can restore (or create) decent filler radiuses then the crank at 
least starts with fatigue resistant geometry. Some regrinds ruin an otherwise 
good crankshaft. 

Dan T 
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