RETROARMS CNC PISTON FOR SHORT STROKE 13T (RA-9423)

CNC MACHINED PISTON
IN NYLON GF30%
FOR SHORT STROKE 13T CONFIGURATIONS
WEIGHT 12g

A SPECIALLY EXTENDED, REINFORCED AND SIGNIFICANTLY LIGHTENED PISTON, DESIGNED FOR SHORT STROKE BUILDS UP TO 13 TEETH.
THE PISTON IS OPTIMIZED FOR RETROARMS GEARBOXES, BUT CAN ALSO BE USED IN STANDARD GEARBOXES.
BEFORE FINAL ASSEMBLY, IT IS NECESSARY TO CHECK IF THE PISTON CAN BE FULLY COCKED BY THE 13-TOOTH SECTOR GEAR.
THIS PISTON DIFFERS FROM THE STANDARD PISTON BECAUSE IT HAS A LONGER BODY AND AT THE SAME TIME ADJUSTED GUIDE DIMENSIONS, ENSURING LESS LEVERAGE DURING A SHORT PISTON STROKE.

THE REAR PART IS SIGNIFICANTLY REINFORCED TO WITHSTAND THE FORCES CREATED BY USING STRONG SPRINGS IN TSG, DSG AND SS SETUPS (PEAK FORCE OFTEN AROUND 19 KG) IN COMBINATION WITH RAPID LOAD CHANGES DUE TO HIGH RATES OF FIRE, OFTEN EVEN 60 RPS.
IT IS THIS COMBINATION AND RATE OF FIRE, ALONG WITH FORCES ON ORDINARY PISTONS, THAT CAUSES THE REAR PART OF THE PISTON TO BREAK AND SHOOTS THE PISTON RACK INTO THE REAR OF THE GEARBOX.

THE PISTON BODY IS MADE VIA CNC MILLING IN NYLON WITH THE ADDITION OF 30% GLASS FIBERS.
THIS MATERIAL HAS EXCELLENT PROPERTIES, PARTICULARLY IT IS WEAR-RESISTANT, RESISTS HIGH TEMPERATURES AND PRESSURES, TOLERATES THE ACTION OF AGGRESSIVE OILS VERY WELL, IS BREAK-RESISTANT AND IS ALSO LIGHTWEIGHT.
THE NYLON MATERIAL USED IS OIL RESISTANT AND ALTHOUGH IT IS NOT ABSOLUTELY NECESSARY TO LUBRICATE THE PISTON BODY GUIDE GROOVES, WE HAVE INTEGRATED LUBRICATION POCKETS AT THE CONTACT POINT BETWEEN PISTON AND GEARBOX.

DESPITE THE ROBUST AND EXTENDED BODY, IT WAS POSSIBLE TO MAINTAIN A RELATIVELY LOW WEIGHT, WHICH IS VERY IMPORTANT FOR FAST BUILDS, NAMELY 16.0 G.
WE ADVISE AGAINST ENLARGING THE DRAIN HOLES DUE TO POSSIBLE DAMAGE TO THE STRUCTURE.
THE WEIGHT OF THE PISTON MAY VARY DUE TO MOISTURE ABSORPTION BY THE MATERIAL.
HOWEVER, WE STRONGLY ADVISE AGAINST DRYING THE PISTON; MOISTURE ABSORPTION SIGNIFICANTLY INCREASES THE MATERIAL STRENGTH.

THE PISTON RACK IS MADE OF HIGH-QUALITY SPRING STEEL VIA CNC MILLING.
THE MATERIAL USED IS FLEXIBLE AND AT THE SAME TIME, THANKS TO HEAT TREATMENT, IT IS ALSO HARD AND WEAR-RESISTANT.
ALTHOUGH IT IS NOT NECESSARY TO GLUE THE PISTON RACK, SOME CUSTOMERS GLUE IT (IN THAT CASE WE RECOMMEND A TWO-COMPONENT EPOXY GLUE) AND FOR THIS VERY REASON WE LEAVE THE RACKS RAW (WITHOUT SURFACE TREATMENT THAT CARRIES AN OIL LAYER) AFTER HEAT TREATMENT, THEREFORE THEY ARE NO LONGER BLACK, BUT DARK GRAY AND MAY PRESENT VARIOUS COLORED SPOTS.
BEFORE INSTALLATION, IT IS RECOMMENDED TO LUBRICATE THE PISTON RACK, IDEALLY WITH SILICONE GREASE.

THIS PISTON HAS 13 TEETH AND IS THEREFORE SUITABLE FOR USE WITH PANDORA SS13T GEARS (8055 OR 8059)