You can weld up the journal and off-set grind it and retain the original
throw size or you can save the welding and cut it down to a smaller size
that you can get a rod an bearing for.
I had my Cadillac 500 off-set ground from a 4.36 stroke to a 4.60, then
turned it on down to a big block Chevy sized bearing.
Kevin
----------------------------
IBA 23360
----- Original Message -----
From: "Chris Burgess"
To: "Walzer, Carl (.)"
Cc: "Greg Verderber" ; "vfrlist"
Sent: Tuesday, October 31, 2006 4:19 PM
Subject: Re: Big bore questions round II - Crank Grinding?
> This reduces the size of the connecting rod journal correct? If so do
> you just make up the size difference with a bearing? If not what do
> you use?
>
> On 10/31/06, Walzer, Carl (.) wrote:
>> Greg, you are basically correct.
>>
>> Grinding is the process, but not like you do it on a bench grinder. Very
>> precise "turning" of the throw to a smaller size, with the center being
>> 1mm
>> further out from the center. Pretty standard when doing "stoker"
>> engines.
>>
>> Carl
>>
>> -----Original Message-----
>>
>> The simplified(?) picture in my mind involves shaving
>> metal off of one side of the throw shafts (if that's
>> the right terminology, the shaft section that the con
>> rods connect to - I'm a technical geek, but not much
>> of a gear head) gradually tapering the grind to keep
>> the shaft round. This would shift the center of the
>> throw shaft out by half the distance of the maximum
>> thickness of metal removed. If that makes sense, and
>> is actually what you propose, then I'm amazed that it
>> can be done at all, let alone be regarded as a
>> relatively safe approach.
>>
>> I don't see how any other metal shaving anywere on an
>> existing the crank shaft would do anything to change
>> the stroke. Though I am willing to be enlightened.
>>
>> Greg
>>
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>
>
> --
> Check out my racing site...http://www.burgiracing.com and my blog at
> http://blog.burgiracing.com
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