Ouch, that's errrr good to know. I have 2 of them (Helicoils) in my new
rebuild. They seem to be working fine so far. I have about 1000 miles on it.
We went ahead and did it this way on the advise of a long time engine
builder.
I will be keeping a close eye on it (which I was planning on anyway)
Larry
On 7/16/01 11:55 AM, "Clayton La Baw" <clabaw@jpl.nasa.gov> wrote:
> David -
>
> I have had poor luck using Helicoils on head fasteners. They are very good
> in other applications, though. I prefer threaded inserts such as Keenserts
> (other brands are acceptable). The hole is drilled oversized, and tapped
> for the insert outer thread, It's screwed in (some brands recommend
> loc-tite) then the locking feature activated. They have worked
> successfully on head studs for air-cooled motors running pretty high
> compression ratios (high temps and lots of pressure).
>
> Clay L.
> '67 Sprite
>
>
> At 08:17 AM 7/14/01 -0400, Larry B. Macy wrote:
>> One word: Helicoil. I really think it should be Healycoil ;-)
>>
>> Larry
>>
>> On 7/14/01 1:13 AM, "David Ramsey" <dwramsey@worldnet.att.net> wrote:
>>
>>> David, I hate to be the one to tell you but you ain't stretching ARP
>>> studs!!!! You also ain't striping the threads on the ARP nuts & studs.
>>> That leaves only the threads in the head.
>>> Crash
>>>
>>>> BTW, the MGA head is on and correct new studs were used (ARP) and I still
>>> felt a
>>>> couple stretch. You know the feeling when the torque wrench never clicks
>>> but
>>>> just keeps turning. I may replace those studs one at a time.
>>>
>>>
--
Larry Macy
78 Midget
Keep your top down and your chin up.
Larry B. Macy, Ph.D.
macy@bblmail.psycha.upenn.edu
System Manager/Administrator
Neuropsychiatry Section
Department of Psychiatry
University of Pennsylvania
3400 Spruce St. - 10 Gates
Philadelphia, PA 19104
Ask a question and you're a fool for three minutes; do not ask a question
and you're a fool for the rest of your life.
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