Transition Patrol, Scout, Sentinel & Suppressor, Giddy Up & SBG Post your bike and discuss here!

PB Forum :: All Mountain, Enduro & Cross-Country
Transition Patrol, Scout, Sentinel & Suppressor, Giddy Up & SBG Post your bike and discuss here!
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Posted: Jan 10, 2019 at 12:24 Quote
andeh23 wrote:
Are your DPX2s kind of noisy? I got my Sentinel yesterday (previously a TBC factory demo), and notice while setting sag that the shock is pretty noisy. It makes a lot of "squish" noise. I haven't ridden it yet, or pulled it open to check what volume spacer it came with (guessing it's got a 0.6 since it was an early 2018, and they come with 0.86 now). I'm wondering if it needs service.

My last shock was a DHX2 so I'm used to my shock being silent.

Cavitated, oil has mixed with the air, they are meant to be quiet. Needs a full strip and rebuild.

Posted: Jan 10, 2019 at 14:02 Quote
matwilliams wrote:
andeh23 wrote:
Are your DPX2s kind of noisy? I got my Sentinel yesterday (previously a TBC factory demo), and notice while setting sag that the shock is pretty noisy. It makes a lot of "squish" noise. I haven't ridden it yet, or pulled it open to check what volume spacer it came with (guessing it's got a 0.6 since it was an early 2018, and they come with 0.86 now). I'm wondering if it needs service.

My last shock was a DHX2 so I'm used to my shock being silent.

Cavitated, oil has mixed with the air, they are meant to be quiet. Needs a full strip and rebuild.

Damnit, that's annoying. Thanks

Posted: Jan 10, 2019 at 16:01 Quote
andeh23 wrote:
matwilliams wrote:
andeh23 wrote:
Are your DPX2s kind of noisy? I got my Sentinel yesterday (previously a TBC factory demo), and notice while setting sag that the shock is pretty noisy. It makes a lot of "squish" noise. I haven't ridden it yet, or pulled it open to check what volume spacer it came with (guessing it's got a 0.6 since it was an early 2018, and they come with 0.86 now). I'm wondering if it needs service.

My last shock was a DHX2 so I'm used to my shock being silent.

Cavitated, oil has mixed with the air, they are meant to be quiet. Needs a full strip and rebuild.

Damnit, that's annoying. Thanks
I would ride it first. My dpx2 was a bit noisy from the start and still is after I just received it back from a service. You will be able to tell fairly quickly if it needs a service or not once you have ridden it.

Posted: Jan 10, 2019 at 16:42 Quote
tricyclerider wrote:
andeh23 wrote:
matwilliams wrote:


Cavitated, oil has mixed with the air, they are meant to be quiet. Needs a full strip and rebuild.

Damnit, that's annoying. Thanks
I would ride it first. My dpx2 was a bit noisy from the start and still is after I just received it back from a service. You will be able to tell fairly quickly if it needs a service or not once you have ridden it.

It might 'feel' ok to ride I have had many customers in with squelchy shocks that have been riding them like that for ages, they can sound like that with just a little bit of air/oil in the wrong place. The effect on the ride depends on the amount of cavitation which has taken place.

When you push down on the bike (/activate the shock) is there a bit of play at the start where it doesn't feel like it's damped at all?

Posted: Jan 10, 2019 at 17:31 Quote
matwilliams wrote:
andeh23 wrote:
Are your DPX2s kind of noisy? I got my Sentinel yesterday (previously a TBC factory demo), and notice while setting sag that the shock is pretty noisy. It makes a lot of "squish" noise. I haven't ridden it yet, or pulled it open to check what volume spacer it came with (guessing it's got a 0.6 since it was an early 2018, and they come with 0.86 now). I'm wondering if it needs service.

My last shock was a DHX2 so I'm used to my shock being silent.

Cavitated, oil has mixed with the air, they are meant to be quiet. Needs a full strip and rebuild.

Can't help myself: That's emulsion, not cavitation. Emulsion is two different substances mixing, cavitation is a fluid experiencing a phase change into a gas due to a drop in pressure.

Big difference in practice when talking about a damper: a damper that is cavitating is either poorly designed, or more likely for a rider, needs its IFP/bladder pressure increased.

A damper that has emulsified air into its oil needs, as you said, a bleed, and often a repair in order to correct whatever allowed the air to enter the oil circuit. Unless it is of a type that can separate the air out (many fork dampers do this.)

Posted: Jan 10, 2019 at 17:46 Quote
groghunter wrote:
matwilliams wrote:
andeh23 wrote:
Are your DPX2s kind of noisy? I got my Sentinel yesterday (previously a TBC factory demo), and notice while setting sag that the shock is pretty noisy. It makes a lot of "squish" noise. I haven't ridden it yet, or pulled it open to check what volume spacer it came with (guessing it's got a 0.6 since it was an early 2018, and they come with 0.86 now). I'm wondering if it needs service.

My last shock was a DHX2 so I'm used to my shock being silent.

Cavitated, oil has mixed with the air, they are meant to be quiet. Needs a full strip and rebuild.

Can't help myself: That's emulsion, not cavitation. Emulsion is two different substances mixing, cavitation is a fluid experiencing a phase change into a gas due to a drop in pressure.

Big difference in practice when talking about a damper: a damper that is cavitating is either poorly designed, or more likely for a rider, needs its IFP/bladder pressure increased.

A damper that has emulsified air into its oil needs, as you said, a bleed, and often a repair in order to correct whatever allowed the air to enter the oil circuit. Unless it is of a type that can separate the air out (many fork dampers do this.)

I was under the impression that cavitation was air bubbles (/cavities) in a liquid, I used the wrong word.
But I don't mind being corrected, I'm not a suspension specialist, I don't know everything, and I'm always happy to learn Smile

Either way, that squelchy shock has air where it shouldn't and needs a service.

(EDIT: I have just read the Vorsprung article on the subject, interesting stuff, #alwayslearning)

Posted: Jan 11, 2019 at 1:58 Quote
groghunter wrote:
matwilliams wrote:
andeh23 wrote:
Are your DPX2s kind of noisy? I got my Sentinel yesterday (previously a TBC factory demo), and notice while setting sag that the shock is pretty noisy. It makes a lot of "squish" noise. I haven't ridden it yet, or pulled it open to check what volume spacer it came with (guessing it's got a 0.6 since it was an early 2018, and they come with 0.86 now). I'm wondering if it needs service.

My last shock was a DHX2 so I'm used to my shock being silent.

Cavitated, oil has mixed with the air, they are meant to be quiet. Needs a full strip and rebuild.

Can't help myself: That's emulsion, not cavitation. Emulsion is two different substances mixing, cavitation is a fluid experiencing a phase change into a gas due to a drop in pressure.

Big difference in practice when talking about a damper: a damper that is cavitating is either poorly designed, or more likely for a rider, needs its IFP/bladder pressure increased.

A damper that has emulsified air into its oil needs, as you said, a bleed, and often a repair in order to correct whatever allowed the air to enter the oil circuit. Unless it is of a type that can separate the air out (many fork dampers do this.)

Beat me to it, thank you lol

Posted: Jan 11, 2019 at 3:27 Quote
dirtnapped wrote:

Decided to go raw for this year!

nice, might be the direction my scout will be heading towards later this year. Post some pics once you get you have it built up.

Posted: Jan 11, 2019 at 8:27 Quote
poah wrote:
gpgalanis wrote:
I wonder why Transition recommends more sag than usual if the leverage curve is too linear. Also many reviews suggest the opposite and consider the Sentinel, the Patrol etc to be quite progressive.

Are you bottoming during regular trail riding or during drops, jumps and hard landings?


to do with anti squat.

Personally I only bottom out on harsh drops and jumps with bad landing never the trail.

Posted: Jan 11, 2019 at 17:38 Quote
matwilliams wrote:
groghunter wrote:
matwilliams wrote:


Cavitated, oil has mixed with the air, they are meant to be quiet. Needs a full strip and rebuild.

Can't help myself: That's emulsion, not cavitation. Emulsion is two different substances mixing, cavitation is a fluid experiencing a phase change into a gas due to a drop in pressure.

Big difference in practice when talking about a damper: a damper that is cavitating is either poorly designed, or more likely for a rider, needs its IFP/bladder pressure increased.

A damper that has emulsified air into its oil needs, as you said, a bleed, and often a repair in order to correct whatever allowed the air to enter the oil circuit. Unless it is of a type that can separate the air out (many fork dampers do this.)

I was under the impression that cavitation was air bubbles (/cavities) in a liquid, I used the wrong word.
But I don't mind being corrected, I'm not a suspension specialist, I don't know everything, and I'm always happy to learn Smile

Either way, that squelchy shock has air where it shouldn't and needs a service.

(EDIT: I have just read the Vorsprung article on the subject, interesting stuff, #alwayslearning)

They are voids, or cavities, they're just filled with gaseous oil. The fact that liquid can flash to a gas, and back to a liquid, due soley to pressure, absolutely fascinates the science nerd in me.

Phase changes are interesting stuff, hikers at high altitude drinking boiling water because it boils at lukewarm with so much less atmospheric pressure, solids sublimating directly into gas, etc. Blows my mind.

Posted: Jan 11, 2019 at 17:42 Quote
Joemorin1217 wrote:
poah wrote:
gpgalanis wrote:
I wonder why Transition recommends more sag than usual if the leverage curve is too linear. Also many reviews suggest the opposite and consider the Sentinel, the Patrol etc to be quite progressive.

Are you bottoming during regular trail riding or during drops, jumps and hard landings?


to do with anti squat.

Personally I only bottom out on harsh drops and jumps with bad landing never the trail.

It's worth stepping outside of the linkage curve and considering the suspension system as a whole: A DPX 2 with a large volume spacer is going to add quite a lot of pogressivity.

Posted: Jan 11, 2019 at 21:21 Quote
Got it all finished up tonight. Quite happy with it!

Rawwrrr

Posted: Jan 11, 2019 at 22:51 Quote
dirtnapped wrote:
Got it all finished up tonight. Quite happy with it!

Rawwrrr

looks good, definitely want to go this route later this year.

Posted: Jan 12, 2019 at 15:35 Quote
Looks downright rugged Dirtnapped. I love the look of raw alloy frames.

Posted: Jan 12, 2019 at 17:29 Quote
finally got a decent ride on the patrol with a smaller volume spacer. I have no complaints. mid stroke felt more supple, and had less harsh ramp up when transitioning to the last 3rd of the travel.


 
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