Johnson 40hp Commercial vs Mariner 40hp Magnum (2-Stroke)
40hp Commercial
40hp Magnum (2-Stroke)
| Spec | Johnson 40hp Commercial | Mariner 40hp Magnum (2-Stroke) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 40 HP | 40 HP |
| Displacement | 737 cc ← | 698 cc |
| Configuration | 2 Cyl / Inline | 3 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 84 kg (185 lbs) | 84 kg (185 lbs) |
| Mechanical & Electrical | ||
| Gear Ratio | 2.42:1 | 1.85:1 |
| Alternator | 144 W | 192 W ← |
| Fuel Delivery | Carbureted | Carbureted |
| Maintenance | ||
| Spark Plug | Champion QL77JC4 | NGK BP8H-N-10 |
| Engine Oil | TC-W3 (50:1) | TC-W3 (50:1) |
Technical Comparison Analysis
Power & Displacement
Comparing the Johnson 40hp Commercial and Mariner 40hp Magnum (2-Stroke) shows a displacement difference of 39cc. The Johnson features a larger 737cc 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 Mariner is the lighter option at 84kg, offering a weight saving of 0kg 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 192W 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.