alekk Senior Member Joined: 7 Dec 2012 Posts: 22 Location: Paris Expertise: I love coffee
Posted Thu Jan 24, 2013, 2:20am Subject: caravel - piston without seal ??
I have seen that some of the latest Arrarex Caravel models (eg. type 2.1) have a piston that does not require any seal. I was wondering if this could cause any issues since I have never seen this kind of piston before. When the Caravel is heated up, can this happen that the cylinder dilates slightly before the piston, which could lead to a loss of pressure (as would happen in other mechanical engines, for example)? I am hesitating between a piston-with-seal model v.s. a piston-without-seal model, any thoughts on that?
samuellaw178 Senior Member Joined: 22 Jan 2011 Posts: 382 Location: KL,Malaysia Expertise: I love coffee
Espresso: Arrarex Caravel Grinder: Rosco Mini Drip: French Press, Aeropress,... Roaster: DIY Copper drum roaster
Posted Thu Jan 24, 2013, 5:32am Subject: Re: caravel - piston without seal ??
They do have seals, 2 O-rings to be exact. And they are located inside the cylinder itself. There's probably not much difference functionality wise. But the O rings could probably be a little easier to find than the U cup 20 years down the road.
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