20b Primary Injector O-ring Sizes?

Revelc · 10-04-2011, 03:46 PM

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.

alvaspeed · 10-07-2011, 12:19 PM

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.

Revelc · 10-10-2011, 05:32 PM

Thankyou!!! Out of the several threads and multiple PMs I've sent, this is the only response. THANKYOU THANKYOU!!

alvaspeed · 10-11-2011, 08:51 PM

No problem. Just remember, these are used and new orings may measure a little tighter.

Revelc · 10-19-2011, 06:53 PM

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.

alvaspeed · 10-28-2011, 04:59 PM

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?

10-04-2011, 03:46 PM	#1
Revelc 20b Tinkerer Join Date: Jun 2010 iTrader: (0) Posts: 15 Rep Power: 0	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.

10-07-2011, 12:19 PM	#2
alvaspeed Rotary Fan in Training Join Date: Jun 2009 iTrader: (1) Posts: 35 Rep Power: 0	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

10-10-2011, 05:32 PM	#3
Revelc 20b Tinkerer Join Date: Jun 2010 iTrader: (0) Posts: 15 Rep Power: 0	Thankyou!!! Out of the several threads and multiple PMs I've sent, this is the only response. THANKYOU THANKYOU!!

10-11-2011, 08:51 PM	#4
alvaspeed Rotary Fan in Training Join Date: Jun 2009 iTrader: (1) Posts: 35 Rep Power: 0	No problem. Just remember, these are used and new orings may measure a little tighter.

10-19-2011, 06:53 PM	#5
Revelc 20b Tinkerer Join Date: Jun 2010 iTrader: (0) Posts: 15 Rep Power: 0	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.

10-28-2011, 04:59 PM	#6
alvaspeed Rotary Fan in Training Join Date: Jun 2009 iTrader: (1) Posts: 35 Rep Power: 0	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?