Piston Pin matterial

[borna]

Hello all,
I got this Chinese multi-cylinder engine, and during the assembly, I noticed that I am missing one piston pin. This is a picture of one set of piston, pin, and connecting rod. Since I decided not to wait for them to send me a piston pin, I’m planning to make my own. That said, the piston is aluminum, and the connecting rod is most likely brass or bronze. So, my question is: What material is best for making the piston pin? Can I use HSS? Should it be hardened or not? If HSS is not a good metal for it, please let me know what to use?

Thanks

 

[kuhncw]

You could use either a piece cut from a drill blank (HSS) or you could use drill rod or silver steel depending on what it is called in your area. Either water or oil hardening are ok and no need to harden the drill rod in this application.

Please let us know how this turns out and post a picture of your engine.

Regards.

Chuck

 

[borna]

You could use either a piece cut from a drill blank (HSS) or you could use drill rod or silver steel depending on what it is called in your area. Either water or oil hardening are ok and no need to harden the drill rod in this application.

Please let us know how this turns out and post a picture of your engine.

Regards.

Chuck

Thanks for the info. Since the diameter of the pin is 4mm exactly, this should work?
https://www.amazon.com/dp/B07SYYDTVZ/ref=ox_ya_os_product?th=1

 

[kuhncw]

That should work. A drill blank would cost less.

Chuck

 

[abby]

Quick question , why would you not harden the piston pin made from drill rod?

 

[kuhncw]

It is ok to harden the piston pin and necessary in full scale engines. Loads are light in our model engines and the engines usually don't run hundreds of hours. Again, either method is ok. Builder's choice.

Chuck