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Old 04-08-2014, 03:20 PM #1
ironyusa
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G3 Spec-R oring question

Has anybody experimented with the orings insider the body on the spec-r, g4 or g5? Based on the manual they're standard -017 and -018 (though the manual lists them as metric) orings. I am curious if anyone has tried urethane or x-rings in there?


Also, does the bumper on the back of the bolt just thread on? It appears so in the G4 manual, but that bugger is tight.
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Old 04-08-2014, 05:28 PM #2
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If the bumper is like the g5..... No.
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Old 04-08-2014, 05:59 PM #3
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Quote:
Originally Posted by ironyusa View Post
Has anybody experimented with the orings insider the body on the spec-r, g4 or g5? Based on the manual they're standard -017 and -018 (though the manual lists them as metric) orings. I am curious if anyone has tried urethane or x-rings in there?


Also, does the bumper on the back of the bolt just thread on? It appears so in the G4 manual, but that bugger is tight.
Quote:
Originally Posted by geckx7 View Post
If the bumper is like the g5..... No.
Haven't tried other o-ring material in any of my DP markers. I am interested in this though. Good question .

As for the bumper.......I believe it is held in place by some sort of epoxy or something of that nature. Also (and I'm not 100% sure of this), I think those are just ridges on the bolt, not threads.
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Old 04-08-2014, 07:31 PM #4
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They are definitely just ridges on the bumper. Just pick them forward and they'll come off. I was able to fit a -017 viton xring behind the bumper and get the bumper to snap back on the ridges. I lose about 1.5mm of forward motion assuming no compression, but I'll test it.


Getting those orings out is going to be a beast.
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Old 04-08-2014, 07:39 PM #5
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Ive tried X rings and polly. I didnt really care for how much more friction they caused at first. Viton seemed to fit nicely compared to buna.

Right now I think I have hbnr and viton in one of our G4s but thats it. I did not spend much time on the subject because there does not seem to be much to gain from a better oring. There are only 3 moving orings and to be honest, the factory fit is pretty good from what I have seen.
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Old 04-08-2014, 08:14 PM #6
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Out of curiosity, what kind of "gain" were you looking for?

HNBR, viton and urethane all have better long-term wear characteristics than buna with urethane being the best. All I could really see from the xring would be something like better shot consistency which is almost impossible to test and/or reduced bolt stick/ lower dwell. With urethane it'd just be the reliability of the seal over extended use.
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Old 04-08-2014, 08:31 PM #7
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I was going for better consistency (in theory) with the xring. The fit seemed tighter though so i went back to buna.

With Polly I love the long term wear gains but the fit was too tight for my liking. I find the same on my Clone. I use Viton on my clones bolt, power tube, inner can. Polly on the valve.

In the G4 now I have hbnr just because its better than buna with no real downsides other than cost.
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Old 04-08-2014, 08:36 PM #8
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Are you running HNBR on the valve? If so, where did you find that 2mm x 13mm in that material?
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Old 04-08-2014, 10:15 PM #9
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No I am not. I dont think I was able to source ANY 2 x 13 unless it was buna.

I know the G3 specified a 90 duro on the valve but the G4 I think was 70 but dont quote me on that.

From my experience, the stem/valve oring rarely needs to be changed. The fitment is usually very loose.
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Old 04-09-2014, 06:35 AM #10
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Theoringstore.com started carrying 1.5mm X 11mm urethanes on my request, so I've emailed them asking about urethane or hnbr in 2mm x 13mm. I can say that I have 2 separate valves and bolts (on to tinker with) and one valve came with the 90duro oring and it sucked IMO. The 70 moved a lot more freely.
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Old 04-09-2014, 08:06 AM #11
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I cant comment on the G4/Spec R with the 90 duro right now. The G4 I do have is using a techt engine.

Every G3 I had had a great fit with the 90 duro. Im not even sure how it sealed but it always did. The G3 had a different oring iirc.
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Old 04-16-2014, 08:18 AM #12
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So, I looked at the manual wrong. The rear bolt oring is actually a 2x19mm metric oring.

I am in the process of having multiple metric orings sourced in HNBR. Despite the better material property specs or urethane, HNBR has been outlasting it in most of my critical sealing applications.
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