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2012 MP4-12C
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1,356 Posts
Latest Info - the black ones are actually from Integral (www.fst.com). They don't make them any longer and won't make them again.

I'm assuming the silver ones are Hydac - can anyone confirm?

Those are the big two companies. I've sent the details and pictures I have to a smaller company and await feedback.
Silver (which are stainless BTW) are Tenneco, at least with part number 11B1538CP_02. Those are supposed to be for a 720s
 
2012 MP4-12C
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1,356 Posts
Hydac makes them for Tenneco.

650S and 720S use the same part number from my recollection.
I can tell you the dealer charges more for them for a 720, but it's probably the same part with a different part number.
 

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2019 720S Coupe Track Pack
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231 Posts
Latest, this is translated by Google:

The problem is that these accumulators cannot be refilled due to lack of space.
This means that they are filled with nitrogen and then welded on the gas side. They do not have to be serviced and have to be replaced at regular intervals.
The standard diaphragm accumulators have a filling valve on the gas side and can therefore be checked regularly and, if necessary, topped up with nitrogen.
The membranes, regardless of the elastomer made, are all permeable in some way, so that the nitrogen pressure will eventually decrease, comparable to the air pressure in your car tires.

If you can tell me the volume, the pressure level, the pre-charge pressure and the elastomer used, then I will be happy to take care of the matter and we will work out it.


That's reasonably positive - if we can somehow have one made with a valve integrated then it would be a serviceable part.

For now I've offered to send them a new one and a defective one for them to look at. Can anyone help with a defective one?
 

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Vendor
“I’m a Tuner”
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1,055 Posts
Latest, this is translated by Google:

The problem is that these accumulators cannot be refilled due to lack of space.
This means that they are filled with nitrogen and then welded on the gas side. They do not have to be serviced and have to be replaced at regular intervals.
The standard diaphragm accumulators have a filling valve on the gas side and can therefore be checked regularly and, if necessary, topped up with nitrogen.
The membranes, regardless of the elastomer made, are all permeable in some way, so that the nitrogen pressure will eventually decrease, comparable to the air pressure in your car tires.

If you can tell me the volume, the pressure level, the pre-charge pressure and the elastomer used, then I will be happy to take care of the matter and we will work out it.


That's reasonably positive - if we can somehow have one made with a valve integrated then it would be a serviceable part.

For now I've offered to send them a new one and a defective one for them to look at. Can anyone help with a defective one?
PM sent

Kevin
Supercar Garage
Kennesaw GA
 
2012 MP4-12C
Joined
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1,356 Posts
Interesting, the pressure on those is different than comes on the 3.8L cars, that one is technically for a 720s and mounts up the same. There is 1 bar higher pressure on it though.
 

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2019 720S Coupe Track Pack
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231 Posts
Could you do a quick measurement with one of them? Use an old one if you prefer.

Could you fill a liquid measuring jug from the kitchen with water (say 500ml) then carefully submerge the vessel into that water? Hold it by the open end and don't submerge it all, just to where the neck starts - that way no water gets inside.

Then note what the measuring jug is reading.

That will let us know roughly what the volume of the sphere is.
 
2012 MP4-12C
Joined
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1,356 Posts
Could you do a quick measurement with one of them? Use an old one if you prefer.

Could you fill a liquid measuring jug from the kitchen with water (say 500ml) then carefully submerge the vessel into that water? Hold it by the open end and don't submerge it all, just to where the neck starts - that way no water gets inside.

Then note what the measuring jug is reading.

That will let us know roughly what the volume of the sphere is.
The volume of the sphere isn't the volume of the hydraulic fluid, which I know on the other ones. The nitrogen pressure being higher is what intrigues me. I know a dealer uses the ones you've got in 12C, 650s, and 570s but they're for a 720s. So, physical shape should be similar, which is what I'm also curious if it varies.
 

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surprised EMF didn't notice the oring seal.
and is the silver one posted above stainless or aluminum? looks like aluminum to me. @Ray_huge can you confirm?
 
2012 MP4-12C
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1,356 Posts
surprised EMF didn't notice the oring seal.
and is the silver one posted above stainless or aluminum? looks like aluminum to me. @Ray_huge can you confirm?
This is how. When the cap is on, it covers the o-ring too.

 
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2019 720S Coupe Track Pack
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OK, I just changed all my Accumulators. I check with a reliable source on how to change them.

You do not need to relieve pressure or bleed the system. You can jack up one wheel at a time and change each one. There was no pressure, You unscrew old one and screw on new one. That's it!
You will need to add some fluid after you drive car for a few blocks. the level will look like it's full when you remove cap, but you will still be able to add fluid.

No codes, drives much better and I does not get an error message anymore when raising car.
I did it the same way on a lift. No lights or problems.
 

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2019 720S Coupe Track Pack
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Not so far - I'm still waiting to get hold of either some broken ones or new ones (which I have ordered).
 
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“I’m a Tuner”
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Not so far - I'm still waiting to get hold of either some broken ones or new ones (which I have ordered).
I have broken ones (Leaky) removed and replaced for clients.

Please PM and let’s discuss a strategy for finding a vendor that can provide a rebuild service.

Kevin
Supercar Garage - The McLaren Specialist
Kennesaw GA
 
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