Mercury 20hp FourStroke EFI vs Tohatsu M18E2 (2-Stroke)
20hp FourStroke EFI
M18E2 (2-Stroke)
| Spec | Mercury 20hp FourStroke EFI | Tohatsu M18E2 (2-Stroke) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 20 HP | 18 HP |
| Displacement | 333 cc ← | 294 cc |
| Configuration | 2 Cyl / Inline | 2 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 45 kg (99 lbs) | 41 kg (90 lbs) ← |
| Mechanical & Electrical | ||
| Gear Ratio | 2.15:1 | 1.85:1 |
| Alternator | 145 W ← | 80 W |
| Fuel Delivery | EFI | Carbureted |
| Maintenance | ||
| Spark Plug | NGK DCPR6E | NGK B7HS-10 |
| Engine Oil | 10W-30 FC-W | TC-W3 (50:1) |
Technical Comparison Analysis
Power & Displacement
Comparing the Mercury 20hp FourStroke EFI and Tohatsu M18E2 (2-Stroke) shows a displacement difference of 39cc. The Mercury features a larger 333cc block, which typically provides superior low-end torque and better hole-shot performance when pushing heavy loads or reaching planning speeds.
Weight & Rigging
In terms of transom weight, the Tohatsu is the lighter option at 41kg, offering a weight saving of 4kg over its competitor. This weight reduction is critical for smaller hulls or boats with limited transom capacity where every kilogram affects the center of gravity and drainage efficiency.
Electrical & Features
For boats equipped with modern electronics, sonar, and shallow-water anchors, the Mercury offers the best charging performance with a 145W alternator. Choosing the right power-to-weight profile between these two 4-stroke engines depends heavily on your specific boat's displacement and daily power requirements.