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Old 10-04-2011, 03:46 PM   #1
Revelc
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Default 20b Primary Injector O-ring Sizes?

I probably should have asked over here first, as my thread over 'there' isn't getting any answers. I pulled the primaries out of my 20b rail last night in preparation for testing them on my newly constructed flow bench and ran into a few problems.

Namely, I'm an idiot and threw them into a bucket of carb cleaner before removing the o-rings. Now they're broken / swollen, duh. Does anyone have the actual dimensions of all 3 o-rings (cross section and ID/OD), or can make some measurements for me? Mazda wants +$100 for 3 upper and 3 lower, and can't even find the middle.






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Old 10-07-2011, 12:19 PM   #2
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Measured in mm,

Top Oring 18.00 I.D. , 22.63 O.D. 2.33(+/-)dia/cross section.
Middle Oring 7.50 I.D. , 14.50 O.D. , 3.49dia/cross section.
Bottom Oring = 8.00 I.D. , 11.00 O.D. , 1.49dia/cross section.

Mind you these are used but sealed well when I pulled them.

Last edited by alvaspeed; 10-08-2011 at 03:26 AM.. Reason: Spelling
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Old 10-10-2011, 05:32 PM   #3
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Thankyou!!! Out of the several threads and multiple PMs I've sent, this is the only response. THANKYOU THANKYOU!!
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Old 10-11-2011, 08:51 PM   #4
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No problem. Just remember, these are used and new orings may measure a little tighter.
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Old 10-19-2011, 06:53 PM   #5
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I just wanted to follow up on this thread with the o-rings I actually used.

I tried a 18.0mm ID 2.5mm CS NBR o-ring on the top slot and it looked too loose.

I actually picked up a kit (3 of the same kit actually =( ) from oriley's that had a bunch, all viton, just to try. The following ended up sealing during my bench testing at stock rail pressure:

Top: 17.1mm ID, 2.6mm CS
Middle: 7.5mm ID, 3.5mm CS
Bottom: 7.6mm ID, 1.6mm CS

Again, thanks for your help.
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Old 10-28-2011, 04:59 PM   #6
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No prob.
BTW do you clean and refurbish these injectors. I had one stick on me and would really like toget them refurbished and maybe even enlarged if possible?

ALso could you give me a link or part number info to the kit from O-reily's?
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