I have been using a starting pressure of 5 and I adjust the pressure up or down during the brewing to keep it at around 9 bars and I think it works pretty well. I thought that was the meaning of variable pressure!
Great video! Just got the same machine as you do (but without the variable flowrate function). However, even though I use the finest grind size I could get (on a De’longhi grinder), with my largest tamping pressure, the extraction flow rate is still way too fast, with 2 bars of pressure on the pressure gauge. 10s to pull a short (with the preset single-short parameters) May I have your opinion on what could possibly go wrong here? Many thanks!
Hi there. It seems your problem is most likely related with your grinder. What kind of grinder are you using? Most cheap electric grinders are incapable of making espresso grind. The second important factor is dosing amount. The stock basket (double shot) can hold around 18g of coffee, try maximising your dose amount to make slower shots. Beans freshness, grind distribution, tamping pressure will also affect the shot time, but given that you are far away from a normal shot, it should be related with the grind size. If your using single shot, keeping the same grind size but with half of the dose (9-10g) should yield similar shot time.
Hey Patrick. Brew temperature is stable imo, since it uses a double thermoblock to keep temperature stability, and I only see a huge decline in temperature after turning on the shower head for 14 seconds (without any coffee). So brewing espresso with only a small amount of water wont be a problem. The steam though is less stable imo, particularly at higher steam flow settings, as you can see water cannot be vapourized completely after a brief while.
Are all of your shots super acidic ?? No matter what I change on my machine and grind size, the shots come out sour and I don't know what else to do with it.... I also have no idea how to work the "pre-infusion" function :( Im lost and I don't want to waste my fresh beans.
Hey there. No, not all of my shots are acidic. However, I tend to get more acidic shots for light roasted coffee, and they are harder to dial in for a good shot. Can you provide more info in your recipe (dose, bean roast level, ratio, shot time etc.) and brew settings (temp, pressure)? Also, are you using the same setup as I do? The pre-infusion function (P1-P4) actually does not make a difference in the KD-310 VPS model, Im not sure about the version without VPS though. You can use a lower pressure setting to get a long pre-infusion effect though for the VPS model.
@@pianocc534 Thank you for relying! Really appreciate your time! I have 310VPS as well and for my grinder, it's model 16. I have been really disappointed at myself coz of the results :( The beans im using are pretty fresh and good quality SOE from Brazil... it does not say what the roasting level is but I think it's medium/dark. I have been aiming for a 1 : 2 / 2.5 ratio within 29secs. My temperature is at 94c and 6 on pressure. "...lower pressure setting to get a long pre-infusion effect though for the VPS model.." So the 2 actually kind of work together?
@@siusi Hey, thanks for the info. Im assuming you are aiming for something around like 18g in and 40g out. What is the pressure you are getting in the pressure gauge? From my experience, using higher pressure settings like 6 or 7, will give you pretty high brew pressures if your shot time is around 29-30s and the shots are likely to be sour and bitter due to channelling. If you have a bottomless portafilter, check whether extraction is done properly. I would suggest lowering your starting brew pressure to 4 or 5, and aim for maintaining a brew pressure of 8-9 bars in a shot time of around 25-30s, but you may have to dial in your grind size to achieve that. You may also change your pressure settings during the shot to increase or decrease the brewing pressure, so you may actually use a very low pressure setting in the beginning, then ramp up the pressure to control the pre-infusion, but I dont think it is the solution to your problem.
@@pianocc534 thank you for your suggestions... i lowered my pressure to 4 this morning and ground my beans finer (from size 17 down to 14), which then led to a very slow extraction 🤦🏻♀️ and had to increase pressure. I Guess I should not have adjusted the grind size...
@@siusi What pressures are you getting? Yes, it seems the grind size is too small from your description. If your getting 8-9 bars of pressure at the pressure gauge at pressure setting 4, the flow should be very normal, and extraction should be done within 30s.
I have been using a starting pressure of 5 and I adjust the pressure up or down during the brewing to keep it at around 9 bars and I think it works pretty well. I thought that was the meaning of variable pressure!
Great video! Just got the same machine as you do (but without the variable flowrate function). However, even though I use the finest grind size I could get (on a De’longhi grinder), with my largest tamping pressure, the extraction flow rate is still way too fast, with 2 bars of pressure on the pressure gauge. 10s to pull a short (with the preset single-short parameters) May I have your opinion on what could possibly go wrong here? Many thanks!
I also went to Starbucks ,bought their beans and asked them to grind them for me (finest grind size), but got the same result back home....
the water flow when not mounting the portafilter looks normal to me
Hi there. It seems your problem is most likely related with your grinder. What kind of grinder are you using? Most cheap electric grinders are incapable of making espresso grind. The second important factor is dosing amount. The stock basket (double shot) can hold around 18g of coffee, try maximising your dose amount to make slower shots. Beans freshness, grind distribution, tamping pressure will also affect the shot time, but given that you are far away from a normal shot, it should be related with the grind size. If your using single shot, keeping the same grind size but with half of the dose (9-10g) should yield similar shot time.
Will try, thank you for your help
been using the delonghi kg521m grinder btw
Hi can you advise how to apply this function to my KD310
What do you think of this machiner temperature performance? Stable?
Hey Patrick. Brew temperature is stable imo, since it uses a double thermoblock to keep temperature stability, and I only see a huge decline in temperature after turning on the shower head for 14 seconds (without any coffee). So brewing espresso with only a small amount of water wont be a problem. The steam though is less stable imo, particularly at higher steam flow settings, as you can see water cannot be vapourized completely after a brief while.
@@pianocc534 Nice. Thanks. Great review from you as always.
如果和Rocket Appartamento这款咖啡机对比，你会推荐哪一款咖啡机呢？ 谢谢
100% 是Rocket
Why would you recommend the Rocket? On what basis?
Are all of your shots super acidic ?? No matter what I change on my machine and grind size, the shots come out sour and I don't know what else to do with it.... I also have no idea how to work the "pre-infusion" function :( Im lost and I don't want to waste my fresh beans.
Hey there. No, not all of my shots are acidic. However, I tend to get more acidic shots for light roasted coffee, and they are harder to dial in for a good shot. Can you provide more info in your recipe (dose, bean roast level, ratio, shot time etc.) and brew settings (temp, pressure)? Also, are you using the same setup as I do? The pre-infusion function (P1-P4) actually does not make a difference in the KD-310 VPS model, Im not sure about the version without VPS though. You can use a lower pressure setting to get a long pre-infusion effect though for the VPS model.
@@pianocc534 Thank you for relying! Really appreciate your time!
I have 310VPS as well and for my grinder, it's model 16. I have been really disappointed at myself coz of the results :( The beans im using are pretty fresh and good quality SOE from Brazil... it does not say what the roasting level is but I think it's medium/dark. I have been aiming for a 1 : 2 / 2.5 ratio within 29secs. My temperature is at 94c and 6 on pressure.
"...lower pressure setting to get a long pre-infusion effect though for the VPS model.." So the 2 actually kind of work together?
@@siusi Hey, thanks for the info. Im assuming you are aiming for something around like 18g in and 40g out. What is the pressure you are getting in the pressure gauge? From my experience, using higher pressure settings like 6 or 7, will give you pretty high brew pressures if your shot time is around 29-30s and the shots are likely to be sour and bitter due to channelling. If you have a bottomless portafilter, check whether extraction is done properly.
I would suggest lowering your starting brew pressure to 4 or 5, and aim for maintaining a brew pressure of 8-9 bars in a shot time of around 25-30s, but you may have to dial in your grind size to achieve that. You may also change your pressure settings during the shot to increase or decrease the brewing pressure, so you may actually use a very low pressure setting in the beginning, then ramp up the pressure to control the pre-infusion, but I dont think it is the solution to your problem.
@@pianocc534 thank you for your suggestions... i lowered my pressure to 4 this morning and ground my beans finer (from size 17 down to 14), which then led to a very slow extraction 🤦🏻♀️ and had to increase pressure.
I Guess I should not have adjusted the grind size...
@@siusi What pressures are you getting? Yes, it seems the grind size is too small from your description. If your getting 8-9 bars of pressure at the pressure gauge at pressure setting 4, the flow should be very normal, and extraction should be done within 30s.
請教 VPS 版 如何正確調校岀 9 bar 壓力？ thx
呢部機不能設定固定壓力萃取，要用咖啡粉粗幼度調教 (VPS係減流速，粉太幼一樣會高壓)。通常用CB07出9bar時會流速太快，而咖啡粉偏幼會流速正常，但又會超過9bar。我自己平時用會磨粉偏幼，用CB04開始，通常會有8-9bar左右，正常流速，之後見壓力跌得太多時再加壓 (CB05-06)。
@@pianocc534 咁都幾麻煩， 咁不如買 310 普通版好過？ 又平啲
@@Danny-eg8mj 呢個VPS雖然係麻煩d，但起碼叫做有空間去調校壓力。正如之前所講，普通版 (姐係得CB07) 一係壓力正常但流速快 (9bar會得十幾秒)，一係會流速正常但高壓，兩者出到黎個味真係冇咁好。你講得出9bar都應該對espresso有一定了解同追求，建議你慎重考慮。
不過講到尾都要睇你budget同要求。我就覺得VPS雖然唔完美，但的確係有用既。不過俾我揀多次可能會再俾多d錢買部有真正壓力調校既鍋爐機。
@@pianocc534 師兄好詳盡 👍 其實部機樣樣好， 就係差冇得固定OPV 真係差咁啲， 賣得呢個價，唔明點解唔做埋落去。
@@pianocc534 我正考慮 mara x 同 wpm 310vps , 價位差唔多， 但完全兩樣野， 各有優缺點， 好難揀。