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Old 10-08-2020, 09:54 AM #1
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 has been a member for 10 years
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STICKY - Alien Deception Oring List

I got my hands on another Deception and while giving it a full rebuild decided to measure/record factory seal sizes, as well as note alternate sizes (red font) that I feel improve over certain factory sizes. I know this has been requested in the past, so here you go.

Note: Assume buna-nitrile (durometer 70) unless otherwise specified.

Port seals (x2): 013 -->014 or 2x10

Note: The factory seals seem to be a 013 and make virtually no contact on the body bore. Bumping up one size to a 014 or to a 2x10 allow the seals to actually seal against their bore. Obviously, you're dealing with several tolerances in this location so results may vary. Choose a seal that provides a positive bore seal without excessively dragging.

Switch: 010 --> 2x5mm
Housing ID front: 011 --> 011 X Ring
Cap front (friction): 010 --> 2x7mm
Cap rear (friction): 010 --> 1.5x7mm
Ram housing OD (x4): 013

Note: The two friction seals are about useless from the factory. The alternate sizes do their job much better. As for the housing ID front seal, an X Ring makes a lot of sense there due to its lube holding ability, durability and improved support. For the ram switch, I felt that the 010 had too loose of a fit in the housing bore, which can allow blow-by and require higher LPR pressure to reach the same results.

HPR Piston: 012
LPR Piston: 010

Air transfer
Valve chamber (the big oblong one): TBD
LPR transfer seal (tiny one in very front): 1x2mm
2x seals in front of solenoid: 1x3mm

Front spool seal: 011 --> 011 X Ring (for the same reason as ram housing)
Rear spool seal: 011 urethane (buna will work but urethane resists nibbling better)
Cap (friction): 012 --> 2x8mm
Housing OD: 1x12mm (the thin one) and 012 urethane (the thick one)
Don't be a turd.

Last edited by imped4now : 10-08-2020 at 11:25 AM.
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Old 10-08-2020, 05:32 PM #2
Big Papa Pink
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Wow, thanks for the info! This is awesome!
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