Johnson 40hp (4-Stroke) vs Mariner 40hp Magnum (2-Stroke)
40hp (4-Stroke)
40hp Magnum (2-Stroke)
| Spec | Johnson 40hp (4-Stroke) | Mariner 40hp Magnum (2-Stroke) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 40 HP | 40 HP |
| Displacement | 815 cc ← | 698 cc |
| Configuration | 3 Cyl / Inline | 3 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 109 kg (240 lbs) | 84 kg (185 lbs) ← |
| Mechanical & Electrical | ||
| Gear Ratio | 2.27:1 | 1.85:1 |
| Alternator | 216 W ← | 192 W |
| Fuel Delivery | EFI | Carbureted |
| Maintenance | ||
| Spark Plug | NGK DCPR7E | NGK BP8H-N-10 |
| Engine Oil | 10W-40 FC-W | TC-W3 (50:1) |
Technical Comparison Analysis
Power & Displacement
Comparing the Johnson 40hp (4-Stroke) and Mariner 40hp Magnum (2-Stroke) shows a displacement difference of 117cc. The Johnson features a larger 815cc 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 25kg 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 Johnson offers the best charging performance with a 216W 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.