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Discussion Starter · #4 ·
I just ordered first one, because it looks more like one on the mountune inlet (shorter 1/2" thread etc).
My plastic push fit connector snapped two days ago during hard acceleration and left me without brakes.

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:surprise: Really mate, you must have **** yourself!
Getting one ordered tomorrow after seeing that!
 

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I think I've got one you can have if you want, the Anembo I have already has one in it, I think I bought this one for my sitech when I had it but never used it.
 

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Anembo do one http://www.ebay.co.uk/itm/Focus-Mk2-RS-ST-Inlet-Plenum-Quick-Release-Vacuum-Fitting-/121739638354?hash=item1c583f7652

And AS do one as well http://www.autospecialists.co.uk/Modified-Inlet-manifold-125mm-Metal-Push-fitting-pipe-upgrade-Product-1100.html

Apart from the first one on you list Mike they all have a taper thread which relies on the taper to form a seal, the other one is a parallel thread and relies on the O ring to form the seal.

The plastic one on the Mountune plenum is also a parallel thread, both are OK just don't overtighten the taper threaded ones as you could crack your plenum.

I've got the AS one on mine and is fine.
 

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My MT plenum has a plastic push fit connector on and I've been advised to get a metal one fitted!
Puma speed is the only place I've been able to find that sell them but they have a choice of 2, does anyone have any idea which one I need?
Cheers in advance.http://www.pumaspeed.co.uk/product-125-mm-Push-Fit-Manifold-Adaptor-for-all-ST225-Alloy-Inlets_5928.jsphttp://www.pumaspeed.co.uk/product-Pumaspeed-Imperial-Plenum-Fitting-12-inch_5927.jsp
My plenum fitting
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I've just changed from the puma speed adaptor to the mountune metal version, it could well be in my head but my brakes feel a lot more solid. As said it could be in my head but imo get the mountune version.

Phone Doug at mountune he sorted me out, £10 delivered you can't go wrong
 

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Yeah a little bit, but handbrake helped ;) It is really strange how little brake power you got without brake booster pressure.
That's different from the 'no brakes' you originally stated. It would just be the servo assist and brakes would still work but you'd need a strong leg...
 

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Don't use taper thread fitting.

The Mountune fitting I have on mine is a little too small tbh and the pipe was a pita to push fully in but at least you know it aint going to pull out as I've heard happening with the early pumaspeed fittings.

Saying that I recently fitted a Mountune plenum for a friend with the parrallel thread fitting which I thought was a pumaspeed, it seemed fine and fitted well.
 

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That's different from the 'no brakes' you originally stated. It would just be the servo assist and brakes would still work but you'd need a strong leg...
It is not, trust me. Practically no brakes if you are doing over 30km/h, car just won't stop.
I had to do engine braking + handbrake + pedal to stop in 400m from 60kmh. Imagine what would happened if road wasn't empty?

If this brake booster is so important then this is serious design flaw from both Ford and inlet manufacturers and can lead to serious accidents.

As we can see even Mountune admited this part is not up to the task when they switched to metal one?
I just think it is a shame they should've warn people about it and send replacement fitting for early model plenums? You don't think so?
 

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Nope :facepalm:

A lot of reading is required before you can say mountune admitted the problem

This topic has had the **** kicked out of it

But short story
Mountune did fit plastic
They stopped fitting them but supplied them in the kit (still plastic)
Customers over did them and they fractured
Mountune changed them for metal
They are tight to fit
But they do fit
 

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It is not, trust me. Practically no brakes if you are doing over 30km/h, car just won't stop.
I had to do engine braking + handbrake + pedal to stop in 400m from 60kmh. Imagine what would happened if road wasn't empty?
If this brake booster is so important then this is serious design flaw from both Ford and inlet manufacturers and can lead to serious accidents.
As we can see even Mountune admited this part is not up to the task when they switched to metal one?
I just think it is a shame they should've warn people about it and send replacement fitting for early model plenums? You don't think so?
I think Mountune would say that it's only a problem if over tightened and thus distorted. Anyway, glad you are okay. Must have been scary!
 

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Cheers for the help and info lads ;)
Didn't realise there was such an issue with these, it's scary to think I've been around Nurburgring 8 times with the plastic one fitted!
I'm assuming mine is an early one tho as plenum was fitted about 4 years ago so maybe it's a stronger one?!
 

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Mine was an early one the came pre fitted, later ones you had to fit yourself. Mountune said they were being overtightened and the ones that came pre fitted would be OK. I noticed a difference in the sound from mine and on investigation found a crack around the last tread, it snapped of completely when I tried to loosen it. Exactly like ph00mers photo.
 

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I think Mountune would say that it's only a problem if over tightened and thus distorted. Anyway, glad you are okay. Must have been scary!
Yes but I installed it over 4 years ago so if it was a installation problem it should crack sooner. And how can you overtighten push fit connector that came installed from mountune?

I am just saying failure of this part can be dangerous with fatal ending and they should admit it. Especially because of their reputation and connections with Ford.

This plastic material is not up to the task and by the look of it, it cracked from engine movement at first hard point next to inlet, not where the pipe is pushed in.

So to make a conclusion, everybody with plastic ones, change it to metal and be safe.
 

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Totally agree about changeing to metal one

It's like changing the plenum some agree its weak others dont

I only changed mine recently it was fitted in2011
 
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