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Crankshaft size
https://www.ausmini.com/forums/viewtopic.php?f=2&t=64446		 Page 1 of 1
Author:  guna mk1 [ Fri Jul 16, 2010 9:14 pm ]
Post subject:  Crankshaft size
Hi
I was wandering if anybody would know if a morris 1300 auto block would have a large or small journal crank fitted. Engine no is 12H169H16- -

Thanks
Author:  Morris 1100 [ Fri Jul 16, 2010 9:31 pm ]
Post subject: 
It should have a large journal crank. It should have been made about 3 years after the change point.
Author:  guna mk1 [ Fri Jul 16, 2010 9:39 pm ]
Post subject: 
Thanks Morris
Author:  Convertible Mini [ Sat Jul 17, 2010 7:59 am ]
Post subject:  Crank
That will be a large Journal Crank Ideal for offset grinding to build a stroker engine but will be a very good Idea to get it Nitrided if you do this.
Author:  drmini in aust [ Sat Jul 17, 2010 8:44 am ]
Post subject:  Re: Crank
Convertible Mini wrote:
That will be a large Journal Crank Ideal for offset grinding to build a stroker engine but will be a very good Idea to get it Nitrided if you do this.

Um.. it depends on your definition of `nitriding'...
Proper (gas) nitriding only works on nitriding steels (EN40B etc) it does SFA hardening for EN16 cranks, which is what these all are.
Tufftriding is the right hardening treatment for EN16 but good luck finding anyone in Oz that still does it.

ref:
from wikipedia-
Examples of easily nitridable steels include the SAE 4100, 4300, 5100, 6100, 8600, 8700, 9300 and 9800 series, stainless steels, some tool steels and certain cast irons. Ideally, steels for nitriding should be in the hardened and tempered condition, requiring nitriding take place at a lower temperature than the last tempering temperature. A fine-turned or ground surface finish is best.

Nitriding alloys are alloy steels with nitride forming elements such as aluminum, chromium, molybdenum and titanium.
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