Question SP G250/109/BA Orifice variations?

[Mobulai]

Well, you can see the thread creeps up to the cone so maybe they also aint that good

 

[buddhasummer]

Thread isn't so much the issue it's the knife edge that is important...

 

[axxel57]

Buddha is right, all movable SP orifices are interchangeable.

They are pretty easy to identify, because as the only manufacturer (AFAK) SP has this little ledge inside the orifice, which is sometimes really helpful when removing a stubborn orifice from the barrel.
Their is a tool everybody should have when he/she wants to remove the orifice.
It makes sure that you don't damage the orifice while pushing it out, because you will not push against the orifice knife directly, but against the ledge.
One look from above will tell you if it is a SP orifice or from another brand........

 

[Mobulai]

What’s the diameter on that rod? Or where can I find one?

 

[rhwestfall]

Orifice Extractor Tool

This tool is used to push out and extract orifice out of second stage barrel or 2nd stage inlet fittings. Suitable for both hex or slotted orifices. It will not damage the knife-edge surface as it is made from Acetal. Regulator parts are not included.

scuba-clinic-tools.com

 

[Mobulai]

Ah awesome! i actually have that buried somewhere — just default to pulling it with a plastic crochet hook or with a wooden dowel
should get it out of its hiding place

 

[Johnsonsa93]

Ah awesome! i actually have that buried somewhere — just default to pulling it with a plastic crochet hook or with a wooden dowel
should get it out of its hiding place

Chopsticks are my go to. P.F Chang's has some of the best

 

[Duglum]

If you find it, can you measure the exact dimensions? I'd just make a model for 3D printing of it.. (and share it here ofc )

Edit: I'm an idiot, i forgot that i can just measure the G250 orifice i cleaned like 2 hours ago. It's 5mm inner diameter, then there's a 1mm ledge reducing it to 4mm after about 3mm of depth. I'll draw up and print something and get back to you.

 

[Mobulai]

They are pretty easy to identify, because as the only manufacturer (AFAK) SP has this little ledge inside the orifice, which is sometimes really helpful when removing a stubborn orifice from the barrel.

so all of them including the "wierd #3" have an inner ledge, even the aftermarket ones

3rd from the left looks odd

Great news eitherway, means scavenging (if no other alternative) just got a lil bit easier (the W1550 frankenreg by @rhwestfall comes to mind)

When I actually get them all cleaned and ready for tuning and testing I will try to mix and match to see if any combos might have weird "implications"
(suspected issues: depth in barrel due to various thread "travels" -- kinda like how a g260 adj knob would fit in a 250 but isn't the right lenght so tuning range is not" fully accessible" as @Kupu found in another thread)

This might take a few weeks (it's finally time to get sea/ocean side soon so only have time to maybe just check on my working regs), whatever findings come up I'll post here

thanks

 

[rhwestfall]

Some time long ago I posted either here or on VDH about finding different height orifices in my barrel popped seconds that it was believed had the same part... I was having tuning issues, and IIRC, just swapped in OEM SP orifices...