TRNorBRN6001
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posted December 06, 2007 07:36 AM
Crank Hardening Techniques
Just curious about some of the Hardening Techniques out there? Which seem better than others and why?
I know some companies which will bake the crank after being repaired/stroked/welded on. I believe this process is known as nitriding or something like that which hardens the out side surface. I have also heard of a process where others will lower the temperature which will harden the material as well.
Can anyone explain in some amount of depth each of the processes and what it does to the material.
Thanks,
Gary
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tcchin
Zone Head
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posted December 06, 2007 08:26 AM
Nitriding involves heat-soaking a crankshaft in an ammonia-rich environment with controlled heating and cooling cycles on either end. It not only hardens the surface of the crankshaft itself to something like 50-60 Rc by producing ferrous nitride, but it also improves the toughness of the material, which increases the fatigue strength of the crankshaft. There are other surface hardening processes, but nitriding is the only one that improves fatigue strength.
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KZScott
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posted December 06, 2007 08:40 AM
very good info!
i would also like to hear about the cryo process
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00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
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tcchin
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posted December 06, 2007 08:42 AM
See my post on Ti valves...
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KZScott
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posted December 06, 2007 08:46 AM
 Edited By: KZScott on 6 Dec 2007 08:49
so if it did work, would it be ok on somthing like a crank? rods? or is that too "impact-intensive "?
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01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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TRNorBRN6001
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Posts: 2021
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posted December 06, 2007 09:54 AM
Thought it was baked, but I guess its boiled instead.
Curious what are some other common techniques for hardening and their applications?
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LandspeedLarry
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posted December 06, 2007 12:29 PM
I use a cryogenic treatment on cranks after welding (stroker) to stress relieve the metal. Nitriding for bearing surface hardness. Both are worth the $$$. cause if the crank goes, everything goes. http://www.nitrofreeze.com/applications.html
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VincentHill
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posted December 06, 2007 02:28 PM
I have seen the Place at Falicon in Clear Water Fla where they heat the crank in what looked to me like a Salt barrel until the crank was glowing red. To me, this process "Normalized" the Metal so that it was not like it was Ever welded. Then it was Machined and then some other polishing process.
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