<VV> A couple of 94mm questions

[Larry Forman]

I think that removing the upper studs was needed to do the case boring 
and     this case has been modified and I would not want to throw away 
all that work.   I have replaced head studs before, but normally use the 
wonderful TimeSerts.

Thanks for the suggestion.

Larry

On 2/24/2018 12:13 PM, Marc Marcoulides via VirtualVairs wrote:
> on question 3, why not find another case?
>
>
>> Hi All,
>> I purchased a "kit" to make a 94mm big bore engine when I was at the
>> CORSA Portland National Convention.   I think that was about 2005.   The
>> machinist was named John and I think the last name was Warner.   I heard
>> that he did good work.
>>
>> I am now about ready to start assembling that engine for possible use in
>> either the Devin C or a Rampside.   However, I have heard of horror
>> stories about the 94 mm big bore engines and wanted some advice.   I
>> have heard of some of the 94 mm jugs cracking or splitting at the block
>> end where they are pretty thin.   I checked the bore and it appeared
>> well within specs for both taper and runout.
>>
>> I was thinking of taking a junked head and having it bored out so I
>> could do a trial torqued measurement for possible changes in taper and
>> runout before the pistons and crank are installed.
>>
>> My first question:
>> Is that needed or even recommended or worthwhile?
>>
>> My second question:
>> Am I in dangerous territory with the 94mm big bore jugs?   They seem
>> pretty stout and this will be for a normally aspirated engine, so no
>> turbo pressures involved.   The engine is NOT for racing, except perhaps
>> for the Devin C use in AutoX.   Rpms will likely remain south of
>> 6,000.   I am interested in an engine that will have plenty of power for
>> fun but will not require frequent rebuilding.
>>
>> Third question:
>> Since the upper row of head studs have been removed, what should I do
>> about replacing them?   I normally would use TimeSerts, but these studs
>> are getting pretty close to the larger bored diameter.   I am concerned
>> about taking even more material very close to the edge.   Should I
>> simply replace the studs and call it good?
>>
>> Thanks for any suggestions,
>>
>> Larry
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