Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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hoffbug
Tony Hoffer
Minnesota
(323 posts)

Registered:
10/15/2007 05:25PM

Main British Car:
Olds 215 EFI

Crankshaft surface hardening???
Posted by: hoffbug
Date: February 02, 2009 10:22AM

I have aROver 4.6 crank that I am going to have the rod journals offset ground to give a 3.4" stroke.
I was wondering if the factory did any nitriding, tuftriding, other other surface hardening on these cranks?
Im guessing that any offset grinding would cut through what little penetration there is .. requiring another round of treatment.


V8Tech
Shaun O'Donnell

(19 posts)

Registered:
01/12/2009 11:37AM

Main British Car:
Re: Crankshaft surface hardening???
Posted by: V8Tech
Date: February 09, 2009 09:18AM

Hi Tony,
Although some later cranks were treated at the factory most were not. I would always recommend Tuftride if budget allows, especially on an 86.36 offset ground crank.
Are you building yourself a 4.8? or are you going for 5.0 with bigger bores?

Shaun


hoffbug
Tony Hoffer
Minnesota
(323 posts)

Registered:
10/15/2007 05:25PM

Main British Car:
Olds 215 EFI

Re: Crankshaft surface hardening???
Posted by: hoffbug
Date: February 09, 2009 01:37PM

Initial plans are for a 4.8.. 294 CI..
.I have the T-top liners from westwood for a 4.6...

3.9 / 4.0 / 4.2 / 4.6 Litre Engines, Part Number WCL 36GFL

ID : 94.00mm (with allowance for finishing)

OD : 99.06mm

Flange OD : 105.23mm

Flange Depth : 5.33mm

Length : 135.64mm



Any idea what the safe overbore is for those?
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