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I was shipped the wrong sized pistons (needed 9mm and got 10mm) for my Yong Heng compressor and thought I would offer them up to NWFA members first.

For those that don't watch the classifieds, but could put them to use.... Classified

I'm also interested to hear if folks typically lube the secondary high pressure pistol or run it dry. There seems to be 2 very convicted camps on both sides of the fence.
What would be the logic behind either way?
 
I'm also interested to hear if folks typically lube the secondary high pressure pistol or run it dry. There seems to be 2 very convicted camps on both sides of the fence.
Well... answered my own question. Ya lube em!! 🤣

The never lube guy seemed to have such conviction, but long story short... no lube turned my 9mm piston ring into nearly an 8mm piston ring within just a few short minutes and never even got to 3k psi trying to top off a 90cu/in tank.

Stopped to let off the pressure, check temps and water feed... all's good... then restarting it wouldn't even go to 100psi. Tore it down and sure enough! Zero... I mean ZERO... piston wall friction and dropped right out. Replaced the ring (luckily only a buck a pop), lightly lubed the piston wall and ring... the baby tank and 2.7L tank all topped off and still going strong.

What's funny is you would think I would learn my lesson. We have folks around here that sell their pedigree to try and reinforce what they are saying... "I know better than anyone else"... which is often BS. The guy I listened to was selling his pedigree too. "I've been in the business for years, I know better than anyone else."... and... results don't lie.

There may be small PCP compressors that don't require lube, but I can say with assurance that the Yong Heng and clone types most certainly do.
 

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