Johnson 140hp (4-Stroke) vs Mercury 135hp (Inline-6 Tower of Power)
140hp (4-Stroke)
135hp (Inline-6 Tower of Power)
| Spec | Johnson 140hp (4-Stroke) | Mercury 135hp (Inline-6 Tower of Power) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 140 HP | 135 HP |
| Displacement | 2044 cc ← | 1635 cc |
| Configuration | 4 Cyl / Inline | 6 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 189 kg (417 lbs) | 135 kg (298 lbs) ← |
| Mechanical & Electrical | ||
| Gear Ratio | 2.59:1 | 2.0 |
| Alternator | 504 W ← | 201 W |
| Fuel Delivery | EFI | Carbureted |
| Maintenance | ||
| Spark Plug | NGK BKR6E | NGK BUHW |
| Engine Oil | 10W-30 Marine | TC-W3 2-Stroke |
Technical Comparison Analysis
Power & Displacement
Comparing the Johnson 140hp (4-Stroke) and Mercury 135hp (Inline-6 Tower of Power) shows a displacement difference of 409cc. The Johnson features a larger 2044cc 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 135kg, offering a weight saving of 54kg 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 504W 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.