Fixing Inconsistent Shot Times
Shot times bouncing around makes dialing in impossible. Here are the common culprits and fixes.
⚡ Quick Answer
Inconsistent shot times typically stem from grinder retention (old grounds mixing with fresh), inconsistent dose (scale or technique), or variable tamping pressure. Temperature instability and pre-infusion inconsistency also cause timing variation. Fix: Single-dose your grinder (weigh beans before grinding, nothing retained), use a scale for consistent dose to 0.1g, develop consistent tamping technique (don't obsess over exact pressure—consistency matters more), and ensure machine temperature is stable (proper warm-up, PID if possible). Track variables: if dose, grind, and tamp are consistent but times vary, look at temperature and pressure consistency. A bottomless portafilter helps identify puck prep issues causing channeling that speeds up shots.
🎯 Key Takeaway: Single-dose for consistency, weigh everything, tamp consistently. If still varying, check temperature stability and channeling.
Common Causes of Inconsistency
1. Grinder Retention (Most Common)
Grounds stuck in grinder from previous session mix with fresh grounds, creating variable density. Single-dose weighing before grinding eliminates this.
2. Inconsistent Dose
Eyeballing dose or using timer-based dosing varies by 0.5-1g, significantly affecting shot time. Use a 0.1g scale.
3. Variable Tamping
Pressing harder or softer, or tilting the tamper, changes puck density. Develop a consistent routine.
4. Temperature Instability
Non-PID machines fluctuate. Allow proper warm-up time. Fluctuating temps cause varying extraction speeds.
5. Channeling
Water finds paths of least resistance, causing fast, gushing shots randomly. Use WDT and level tamp.
Consistency Checklist
- • Single-dose: Weigh beans before grinding every time
- • Purge grinder: Run 1-2g through if retention suspected
- • Use scale for dose: 0.1g precision for consistency
- • Consistent tamp: Same pressure, level every time
- • WDT distribution: Break up clumps consistently
- • Machine warm-up: Same wait time before each session
- • Same basket: Don't switch baskets mid-session
- • Same beans: Don't switch roasts mid-session