alekk Senior Member Joined: 7 Dec 2012 Posts: 22 Location: Paris Expertise: I love coffee
Posted Thu Jan 24, 2013, 1:20am 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: 372 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, 4:32am 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.
Symbols: = New Posts since your last visit = No New Posts since last visit = Newest post
Forum Rules: No profanity, illegal acts or personal attacks will be tolerated in these discussion boards. No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum. No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum. Who Can Read The Forum? Anyone can read posts in these discussion boards. Who Can Post New Topics? Any registered CoffeeGeek member can post new topics. Who Can Post Replies? Any registered CoffeeGeek member can post replies. Can Photos be posted? Anyone can post photos in their new topics or replies. Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts. Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.