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Expansion caps, real OEM or not. 1 year 6 months ago #195377

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As this is a continuing theme on the forum,  I thought a bit of scientific examination was called for.
I bought a genuine (Rimmer bros) expansion cap and another eBay bargain, which was half the price of Rimmers.

Here they are together. 

And the insides.   NOW THEN:- Which is genuine and does it make any difference? 

I tested both with my pressure tester setup. 

Results:-  1 held around 14- 15  psi,       

1 held around 6 psi.
 
David
:shrug:
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Last edit: Post by David Aiketgate.

Expansion caps, real OEM or not. 1 year 6 months ago #195378

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Which is real?
 

Incidentally the Real one came in this packing from SAIC

David
:shrug:
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Expansion caps, real OEM or not. 1 year 6 months ago #195379

So genuine Chinese rubbish is better than aftermarket Chinese rubbish!
"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"

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Expansion caps, real OEM or not. 1 year 6 months ago #195380

Aay up David . Ive just bought one of those caps from Rimmers for our MPI classic Mini and it came in a SIAC bag . My question is,  which one of yours failed ?  Since I retired from the motor trade I do find that I miss the equipment like your tester for cooling systems.  Took it all for granted while I was working . I might have to invest in one of those if the caps are of such bad quality.     
John 

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Expansion caps, real OEM or not. 1 year 6 months ago #195381

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The SAIC cap is the good one!
The one on the left.

 
David
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Last edit: Post by David Aiketgate.

Expansion caps, real OEM or not. 1 year 6 months ago #195382

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This is the pressure test kit I have.



You do need to make up a threaded adapter to test caps as opposed to testing the entire system.
David
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Expansion caps, real OEM or not. 1 year 6 months ago #195383

I might have to invest in one. 👍

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Expansion caps, real OEM or not. 1 year 6 months ago #195391

Thanks David for doing this little test, truly surprising. I'm glad I've always paid the extra for a genuine cap from Rimmer.
Mark
95 MGF

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Last edit: Post by mowog73.

Expansion caps, real OEM or not. 1 year 6 months ago #195426

If you don’t have the adaptor to test caps you can use two coolant tanks joined together with a couple pieces of hose. Put the cap under test on one tank and something like the Laser pressure tester on the other tank and pump away.
Nigel
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