Fioroni Duel Action Pistons
06-11-2014, 04:11 PM
#316
Tech Addict
iTrader: (1)
So after messing around with various oil weights and switching out different pistons, I figured why I wasn't getting consistent performance with the Fioronis. This is one of those FYI posts, just in case someone else encounters a similar problem.
It turns out that one of the pistons was slightly damaged. The outside edge of one of the pistons was bent inward, trapping the O-ring, keeping it from expanding outward and sealing against the shock body wall. I carefully bent it back. It may not be perfect, but it's a lot closer.
I measured the diameter of the piston (with O-ring) to be 14.5mm, while the stock piston is 14.8mm. Then I noticed that on all the pistons, the O-ring seemed to be stuck in it's groove. It didn't appear that it was able to stretch out like it is designed to.
So I sanded the pistons with 600 grit wet dry paper. Doing this smoothed the groove the O-ring sits in and made it slightly wider.
After putting the O-ring back in, I measured again. Now it measures 14.78mm, nearly identical to the stock piston. The difference is due to the O-ring not being stuck in it's groove.
The result? Now they are working much better. I'm back to 45wt Losi shock oil (I had gone up to 60 wt during my little adventure). The damping is now very effective. Suspension is soft on small bumps, but doesn't bottom out except on the biggest jumps. Maybe I'll go to lighter oil at some point...I'll see how I do next race.
So...if you get these, tune them before you run them. A couple minutes sanding on them with fine grit sandpaper will ensure optimal performance.
It turns out that one of the pistons was slightly damaged. The outside edge of one of the pistons was bent inward, trapping the O-ring, keeping it from expanding outward and sealing against the shock body wall. I carefully bent it back. It may not be perfect, but it's a lot closer.
I measured the diameter of the piston (with O-ring) to be 14.5mm, while the stock piston is 14.8mm. Then I noticed that on all the pistons, the O-ring seemed to be stuck in it's groove. It didn't appear that it was able to stretch out like it is designed to.
So I sanded the pistons with 600 grit wet dry paper. Doing this smoothed the groove the O-ring sits in and made it slightly wider.
After putting the O-ring back in, I measured again. Now it measures 14.78mm, nearly identical to the stock piston. The difference is due to the O-ring not being stuck in it's groove.
The result? Now they are working much better. I'm back to 45wt Losi shock oil (I had gone up to 60 wt during my little adventure). The damping is now very effective. Suspension is soft on small bumps, but doesn't bottom out except on the biggest jumps. Maybe I'll go to lighter oil at some point...I'll see how I do next race.
So...if you get these, tune them before you run them. A couple minutes sanding on them with fine grit sandpaper will ensure optimal performance.
07-30-2014, 09:21 PM
#318
I just ordered some 16mm from absolute for my Kyosho tki3. For some reason they are binding pretty badly. My initial thought was that they accidentally packaged some 17mm pistons. Anyone have an exact OD measurement of 16mm pistons with or without oring installed? Anyone else buy a pair and not have them fit?
08-07-2014, 10:29 AM
#319
Hey guys, I have a set of Fioroni pistons I'd like to try on the xb9 shocks. I believe they are the 15mm pistons. I know the shock body for Xrays are a tad larger inside. Would I be able to get a way with using these pistons?
12-02-2014, 07:30 PM
#320
Tech Adept
Which Pistons fit the Tekno buggy
12-03-2014, 05:00 AM
#321
I believe the 16mm size
12-04-2014, 02:18 PM
#323
Tech Adept
12-04-2014, 03:32 PM
#325
Will the 16mm pistons fit he new mbx7r shocks?
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