Mariner 20hp (2-Stroke) vs Mercury 18hp (2-Stroke)
20hp (2-Stroke)
18hp (2-Stroke)
| Spec | Mariner 20hp (2-Stroke) | Mercury 18hp (2-Stroke) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 20 HP | 18 HP |
| Displacement | 400 cc ← | 300 cc |
| Configuration | 2 Cyl / Inline | 2 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 48 kg (106 lbs) | 39 kg (86 lbs) ← |
| Mechanical & Electrical | ||
| Gear Ratio | 2.00:1 | 2.0 |
| Alternator | 144 W ← | 60 W |
| Fuel Delivery | Carbureted | Carbureted |
| Maintenance | ||
| Spark Plug | NGK BP8H-N-10 | NGK B7HS |
| Engine Oil | TC-W3 (50:1) | TC-W3 2-Stroke |
Technical Comparison Analysis
Power & Displacement
Comparing the Mariner 20hp (2-Stroke) and Mercury 18hp (2-Stroke) shows a displacement difference of 100cc. The Mariner features a larger 400cc 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 Mercury is the lighter option at 39kg, offering a weight saving of 9kg 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 Mariner offers the best charging performance with a 144W alternator. Choosing the right power-to-weight profile between these two 2-stroke engines depends heavily on your specific boat's displacement and daily power requirements.