[BlackCatCoffee]

Am I right in thinking when the lever is pulled the cam at the back of the group activates the pump to fill the brew chamber from the boiler?

Or does it just fill on pressure from the boiler alone?

 

[DavecUK]

Am I right in thinking when the lever is pulled the cam at the back of the group activates the pump to fill the brew chamber from the boiler?

Or does it just fill on pressure from the boiler alone?

As it's dual boiler and always feeds from internal tank even when plumbed, yes the pump fills the group.

 

[BlackCatCoffee]

As it's dual boiler and always feeds from internal tank even when plumbed, yes the pump fills the group.

So in theory you could leave the lever down and pull a shot on pump pressure?

 

[John Yossarian]

So in theory you could leave the lever down and pull a shot on pump pressure?

I think the pump doesn't go above 4 bars?

 

[DavecUK]

So in theory you could leave the lever down and pull a shot on pump pressure?

No, a gear pump was chosen that had a maximum pressure of 4.2 bar but a very good flow rate. The pre infusion pressure people would use is envisaged to be between 1 and maximum 4 bar but probably 3.5.

 

[BlackCatCoffee]

I think the pump doesn't go above 4 bars?

Ahh, it would be pretty pointless anyway to be honest, I am just curious.

 

[BlackCatCoffee]

No, a gear pump was chosen that had a maximum pressure of 4.2 bar but a very good flow rate. The pre infusion pressure people would use is envisaged to be between 1 and maximum 4 bar but probably 3.5.

Got it. Cheers Dave.

 

[DavecUK]

Ahh, it would be pretty pointless anyway to be honest, I am just curious.

With the configuration of the LSM group it would be pointless. It generates good pressure with a profile as it should be and designed for preinfusion pressures below 3.5 bar.

 

[4085]

I am totally unsure on the relevance of bar pressure to pre-infusion. I think boiler temp has a far greater effect on the shot. Ok, so in theory you can using an ap, change your bp but apart from visually seeing the change, can anything happen so quickly?

 

[Holonomic]

Just finished reading the entire thread, I am rather tempted with one of these units but have not fully committed yet, very close to buying this over a V or even a LMLM...

 

[Holonomic]

So, I am wondering how well the vostok would handle lighter roasts?

I tend to enjoy a variety of roasts, the main reason I didnt settle on the LMLM was that lighter roasts may not be ideal for that machine..

So, how would the vostok be with different roast profiles? Again this (ability to get the best from light and dark roasts) is the main reason I was looking at the vesuvius!

 

[Rob1]

AFAIK the LMLM isn't anything special. Saturated group. The paddle isn't functional for flow profiling I don't think, not without modification anyway unless they've changed it.

 

[Holonomic]

AFAIK the LMLM isn't anything special. Saturated group. The paddle isn't functional for flow profiling I don't think, not without modification anyway unless they've changed it.

Yup, ofcourse but what it does have going for it (imo) is longevity, knowing that parts and an engineer who knows how to service it will still be around in 15+ years is nice to know.

I guess what I am asking is for someone to explain what the vostok has over the LMLM (I know a of a fair few, but would like to hear it from someone else to confirm)

 

[John Yossarian]

Yup, ofcourse but what it does have going for it (imo) is longevity, knowing that parts and an engineer who knows how to service it will still be around in 15+ years is nice to know.

I guess what I am asking is for someone to explain what the vostok has over the LMLM (I know a of a fair few, but would like to hear it from someone else to confirm)

Both Vesuvius and Vostok (this is expected) come equipped with high quality parts, similar to what LMLM sports inside. Longevity-wise they should not differ.

I have not used a lever machine myself but like to profiling on the V that gives me that option and I enjoy sweet shots.

I trust DavecUK when he says that this machine (Vostok) is comprised of a lot of advancement in the coffee engineering and I have no doubt it would be a great lever machine once it hits the market, which is in near future.

For example the pump driven pre-infusion is something that other lever machines do not have. Is this a crucial for the quality of shots, time will tell. Being able to control this stage of brewing is essential IMHO.

 

[DavecUK]

I guess what I am asking is for someone to explain what the vostok has over the LMLM (I know a of a fair few, but would like to hear it from someone else to confirm)

I think until production machines are in the hands of owners, it will be difficult to know anything. They are 2 very different machines and it's going to depend on what it is you want from a machine.

 

[Marocchino]

For example the pump driven pre-infusion is something that other lever machines do not have.

Just for accuracy - my Londinium R has that feature and though now superseded, the replacement model LR 24 supposedly has that feature too. As I don't have the newer model, I can't say for sure. I set my PI from 1 to 6 bar on the fly with an app.

 

[The Systemic Kid]

on both the Londinium R and R 24, the rotary pump drives pre-infusion hence the ability to adjust up to 6 bar.

 

[DavecUK]

on both the Londinium R and R 24, the rotary pump drives pre-infusion hence the ability to adjust up to 6 bar.

I'm wondering if there is some confusion over the V-Vostock having twin boilers, pid shot temperature control with active group heating and display of actual shot pressure allowing some control over the extraction profile.

It's why I think there will be more clarity when owners get full production machines.

 

[John Yossarian]

Just for accuracy - my Londinium R has that feature and though now superseded, the replacement model LR 24 supposedly has that feature too. As I don't have the newer model, I can't say for sure. I set my PI from 1 to 6 bar on the fly with an app.

I stand corrected.

 

[4085]

Just for accuracy - my Londinium R has that feature and though now superseded, the replacement model LR 24 supposedly has that feature too. As I don't have the newer model, I can't say for sure. I set my PI from 1 to 6 bar on the fly with an app.

Is that a bit like how the Strega functions?