OS 46 FX PISTONS ARE NEW - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-22-2003, 05:26 AM   #1
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Anybody notice that the pistons that come with the OS 46 FX is different from older FX version? The older FX version was a standard piston with a groove about 1mm from the top, this groove was for holding oil to help seal and lubricate piston against sleeve..... but if you order a new piston or buy a new FX you will notice that the top 1/3 and bottom 1/4 of the piston has a small amount of the piston surface machined off making only the center sides of the piston come into contact with the sleeve..... anyway... does anybody have an official reason for this? ... I assume it is an attempt to alleviate the cylinder peeling problem they have been experiencing... but has anybody checked to see performance differences due to the factory mods? .....
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Old 11-22-2003, 11:26 AM   #2
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YS did this on the 140L where they removed piston skirt area and left very little area in contact with the sleeve (ringed engine). I really dont know why, if it was to just lighten the piston or for some other reason (you could change to full skirt piston without noticable performance change). Ultimately what it did do was allow the piston to rock as it was mostly unsupported which in turn cause both the piston and sleeve to go out of round by 4-5 thou.....at which time replacement was needed.

They have gone back to full skirt pistons and all the issues went away

I cant see their change doing anything other than causing problems....
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