Offset grinding crank ?

1347 · 06-22-2019, 12:46 PM

I never heard of anyone hard chroming a crankshaft to bring up a surface thickness. I thought it was like nitriding, to give a harder surface so the bearings doesn't bite into the journal.

orangemonster · 06-22-2019, 06:31 PM

Maybe for both.About ten years ago I had picked up a crank from a still active today Stock/super stock mopar racer and it was offset ground and hard chromed journals to standard bearing size.

Daran Summerton · 06-24-2019, 08:35 PM

I once did a back to back on a bracket car. 355 vs 383 sbc everything equal. 355 ran 6.80 - 383 ran 6.80. 1/4" made no difference.

Paul Precht · 06-24-2019, 11:12 PM

Quote:

Originally Posted by Daran Summerton

I once did a back to back on a bracket car. 355 vs 383 sbc everything equal. 355 ran 6.80 - 383 ran 6.80. 1/4" made no difference.

I did that in 74 with a 426 street wedge and a 383, same heads, cam, carb and the 383 Torker instead of the 440 Tarantula, the 383 was used after I spun a bearing in the 426 so I could still bracket race every week while I built a new engine. The 383 had almost a point less comp. and about 80k miles on the shortblock, it ran within a tenth and a mph of the average of the 426.

Timetraveler · 07-02-2019, 07:52 PM

You can weld and regrind the journals to get the stroke you want and keep the standard size. Also we were chroming crank journals back in the sixties.

Adger Smith · 07-06-2019, 03:30 AM

Take it to a smaller journal size.2.100 to 2" Ect..
I have built many BBC with a 2.100 J instead of 2.2

GTX JOHN · 07-06-2019, 12:06 PM

The .013 Offset only adds a very small amount of displacement!

06-22-2019, 12:46 PM	#1
1347 Senior Member Join Date: Aug 2007 Location: Monroe Twp NJ Posts: 507 Likes: 1,043 Liked 1,001 Times in 276 Posts	Re: Offset grinding crank ? I never heard of anyone hard chroming a crankshaft to bring up a surface thickness. I thought it was like nitriding, to give a harder surface so the bearings doesn't bite into the journal. __________________ Duane Hoven 1342 SS/GT Last edited by 1347; 06-22-2019 at 12:58 PM.

06-22-2019, 06:31 PM	#2
orangemonster Junior Member Join Date: Jun 2019 Posts: 6 Likes: 0 Liked 3 Times in 2 Posts	Re: Offset grinding crank ? Maybe for both.About ten years ago I had picked up a crank from a still active today Stock/super stock mopar racer and it was offset ground and hard chromed journals to standard bearing size.

06-24-2019, 08:35 PM	#3
Daran Summerton Senior Member Join Date: Jun 2003 Location: Las Vegas nv Posts: 600 Likes: 18 Liked 66 Times in 37 Posts	Re: Offset grinding crank ? I once did a back to back on a bracket car. 355 vs 383 sbc everything equal. 355 ran 6.80 - 383 ran 6.80. 1/4" made no difference. __________________ 72 cutlass

07-02-2019, 07:52 PM	#5
Timetraveler Member Join Date: Aug 2002 Location: Florida Posts: 103 Likes: 79 Liked 12 Times in 6 Posts	Re: Offset grinding crank ? You can weld and regrind the journals to get the stroke you want and keep the standard size. Also we were chroming crank journals back in the sixties.

07-06-2019, 03:30 AM	#6
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Offset grinding crank ? Take it to a smaller journal size.2.100 to 2" Ect.. I have built many BBC with a 2.100 J instead of 2.2 __________________ Adger Smith (Former SS)

07-06-2019, 12:06 PM	#7
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,736 Likes: 2,808 Liked 2,487 Times in 698 Posts	Re: Offset grinding crank ? The .013 Offset only adds a very small amount of displacement! __________________ John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 07-06-2019 at 12:08 PM.

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