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Author Topic:   Nitriding
primal2
Dirt Roller

Total posts: 18
posted October 01, 2005 12:59 PM  
I have access to free nitriding by a professional outfit with lots of racing experience. Other than crankshafts what else can be nitrided. Can a new cast crank get nitrided? How about used stuff? Are there any forseeable problems with nitriding parts? Thanks.

oldfordmod
Dirt Full Roller

Total posts: 46
posted October 01, 2005 04:09 PM  
A cast iron crank rings just like a steel crank when nitrided. Nitridding inparts a compressive stress to the crank surface which must be overcome before any shear stress can be subjected to the crank core. Thats the engineering explaniation, in racer talk "it works good". I have ran a cast iron ford crank (nitrided) in a 351 stocker many times before a steel crank was available and I never broke one.

primal2
Dirt Roller

Total posts: 18
posted October 01, 2005 08:34 PM  
Thanks. I wanted to make sure it would not become brittle during the process. Can you think of any other components that could be nitrided? Axles, gears, input/output shafts for example?

oldfordmod
Dirt Full Roller

Total posts: 46
posted October 02, 2005 09:38 AM  
Nitriding will leave a ash like surface finish which will have to be polished off. You will have to tape up the journals and blast the rest of the crank to clean it off, then have the crank polished. I polished my own with 600 grit sandpaper. Be careful not to polish too much as to change the bearing diameter. Also be sure the heat-treater stands the crank up to treat it, otherwise it could warp. Any part except rods can benifite from nitriding, however most parts what need it have already had it done. Also,It only works on iron or steel parts. I can't think of any ather part that I would do it to because its already been done or because of the necessary clean up to bearing journals. Maby someone else can come up with other suggestions.

primal2
Dirt Roller

Total posts: 18
posted October 02, 2005 02:00 PM  
Thanks for your input.

James Ott
Dirt Maniac

Total posts: 131
posted October 02, 2005 03:35 PM  
gas nitirding is about the best, less crust to clean up

primal2
Dirt Roller

Total posts: 18
posted October 03, 2005 02:19 PM  
How much work will be required to clean up the journals? A couple of hours for example? Gas nitriding is what is available to me. The company doing the work has lots of experience and yes they stand the cranks on end.

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