Do you still have the old/broken parts?

I understand the MP4 and earlier cars have a different part number to the later cars.

 

Do you still have the old/broken parts?

I understand the MP4 and earlier cars have a different part number to the later cars.

720S P/N = 11B0225CP.01

720 accumulators are compatible with all other cars, I'm not sure what's different spec wise. I'd love to have the info off the 720 accumulators to compare.

 

Early ones are not painted AFAIK.

I have a sneaky feeling they have changed manufacturers - reading between the lines of the email I had.

I also think it's political that the big two manufacturers aren't willing to look into this - they don't want to step on each others toes or risk future contracts. But there are other companies who I'm sure won't have such reservations.

 

Early car what models? Every car I've put eyes on them were painted and new ones installed have all been painted. The 720 accumulators new in box were not painted.

 

Maybe it's the other way around - earlier cars are painted and recent cars (from 650S?) are unpainted. I'm only going off of what others here have posted and some posts about 720S suspension I found online.

A McLaren dealer told me there are two models, one for earlier cars and one for current models - but they didn't say they were interchangeable.

 

I have an early 2012, on one of the last 2014's made they were still black. I suspect late 2019 720's are not painted because they're stainless, all other cars and timeframe are black.

 

I think someone asked how tight to install accumulators... another post said "Torque the accumulators to 25NM" just FYI if you're looking around for it.

 

Partnumber of Mp4


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I've seen 650S articles and eBay listings for spares showing them unpainted:

McLaren's $265K Supercar Tricks You Into Thinking You're a Pro Racer

The Corkscrew, the iconic eighth turn at Mazda Raceway Laguna Seca, is a monster. In just 450 feet, the quick left-right combo drops you the equivalent of 5 1/2 stories, a drop so steep you can’t see the second apex from the first. It is as close to driving off a cliff as you can \[…\]

www.wired.com

McLaren 650s Radaufhängung vorne links front Suspension left | eBay

Entdecken Sie McLaren 650s Radaufhängung vorne links front Suspension left in der großen Auswahl bei eBay. Kostenlose Lieferung für viele Artikel!

www.ebay.de

Maybe they used various suppliers and just fit whatever they have on the shelf at the time - if they are all interchangeable then it doesn't really make a difference.

 

So maybe the P/N is almost the same - and the .01 signifies an update? That's why they are interchangeable.

@Soxten I'm assuming the ones you purchased were painted black?

 

Stamped on the parts there are different numbers from updates, not just the McLaren part number.

 

Yes black


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and they were welded shells or looked like the silver one with the rolled top lip?

 

Part number I got is : 1221B1538CP for my 2018 720s and they are Silver

 

It's possible the McLaren dealer I spoke to still had 11B0225CP.01 which would be compatible for my 720S. They had stock on the shelf so I'm sure were keen to move them before getting any updated parts.

Either way, it seems they are all interchangeable and we have three part numbers:

11B0225CP - from the first MP4 onwards and painted black
11B0225CP.01 - not exactly sure when these were introduced but probably still back.
11B1538CP_02 - seems to have arrived during 650S production and is silver

 

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.

 

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

 

My 2018 had them replaced in May of 2020. Here’s a photo of the front driver’s side. Part numbers don't come back on a Google search for me.

 

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

 

Just got these in the mail. Maybe these pics will help. Thanks XPRD!

 

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.

 

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.

 

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?

 

its aluminum.

 

Pic doesnt work..

 

 

I did it the same way on a lift. No lights or problems.

 

any update on the tenneco serviceable units?

 

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

 

Hi.

have anyone figured out if the Hydac accumulators can be replaced by another manufacture that is willing to sell direct to customers?
I have had a talk to a Parker dealer and they need Nitrogen pressure(7,5bars for 720S), the volume and the thread. Does anyone know about volume and thread?

 

First let me say I am not discuraging you from this search for an alternative! I will gladly help as the dealer parts are very over priced.

I have extensively searched for a different source for the accumulators and I have found it is impossible to get the original manufacturer to sell them directly or indirectly.

The major issue you will run into is you might find a different manufacturer that has the same specifications as far as internal volume, pressure, tread pattern.

But if the different manufactures item is not exactly the same size externally, it will not fit into the confined mounting space due to interference with other parts of the car.

Sean @EMF Audio (McMedics) and I are in Austin TX restoring a few McLarens for another week, but I’ll be glad to get the specifications that I have written down at home and share them here in this thread when I return to my shop in Atlanta.

Kevin
Supercar Garage - Your McLaren Specialist

 

Now I have looked around and it's going to be original accumulators.
Does people change al 4pcs or in my case just the 1 that is broken?

Best regards

 

Change all 4. One is bad, the others will be soon

 

So this took a while to arrive, but it's finally here so I'll move on with this little project. Fingers crossed we can come up with something better or hopefully even serviceable.