Help! > Specific Engine Help
Clearance Holes
tel:
--- Quote ---Ever since my teens, I've hated studs - the thread on the exhaust studs on for instance a Puch mopeds always disappeared after a few years
--- End quote ---
:Lol: Blame the material, not the stud! Make a set out of stainless or bronze and they will last forever and a bit.
Steam Haulage:
Whlle we're talking about strength and accuracy as well as reproducing full size practice in a model engine has anybody considered the use of these? http://www.helicoil.com.sg/.
I have worked in a shop where Helicoils are used in aero engines. You will see on the linked site that there is more than a handful of specs. for various applications.
Jerry
Ian S C:
We used Helicoils mainly on exhaust studs on aircraft engines, mostly Continental IO 470/ IO 520.
One person in NZ had an engine failure because of a Helicoil, he rethreaded the sparkplug hole with a stainless coil, instead of a bronze one as specified,(single cylinder Robin engine, on an Ultra Light aircraft), cooked the sparkplug through lack of cooling. Ian S C
Steam Haulage:
Ah, spark plugs! Helicoils come in StSt and Bronze. (follow the link above.)
Although I didn't specify, (my mistake) the ones I meant were of the Suck-Squeeze-Bang-Blow type. In some of these engines flanges are connected using 91+ studs or some other odd number with an H-C or equivalent in every one. It's quite possible you have been conveyed using them perhaps for several thousand miles.
Jerry
Admiral_dk:
--- Quote ---Blame the material, not the stud! Make a set out of stainless or bronze and they will last forever and a bit.
--- End quote ---
That's right Tel - I can only whole heartedly agree the that originals where crap and the material was to blame, but stainless might not have worked with the rest (or it might), not all materials work equally well together. But the fact was that we had easy access to cheap bolts that never failed and the studs always did, no matter what brand of bike.
I suspect the one of the main reasons where that we always have our roads covered in salt in wintertime => a stud + nut will be covered inside out in a corrosive solution that destroys them :hellno: But using a bolt + washer => that almost nothing of the salt-solution would enter the thread in the cylinder = no trouble :D
I've repaired a number of threads with Helicoils, but I can't see them do studs as a repair - sorry.
Ian - thanks for the warning about stainless Helicoils in sparkplug applications :o
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