Anyone can talk the big talk, but what do the numbers tell? Here's how Medusa engines compare to their competition.
Competing engines have been chosen based on comparable displacements, power figures and popularity in the repower market. These are the best known, most used repower engines.
MEDUSA 400
| Engine Model | Medusa 400  |
Mercruiser 8.2 H.O. DTS  |
MarinePower 7.4 L |
Crusader Classic 6.0 MPI |
Mercury 502 MAG |
Mercruiser 383 Stroker Scorpion |
|---|---|---|---|---|---|---|
| Displacement | 6.3 L/383 ci | 8.2 L/502 ci | 7.4 L/454 ci | 6.0 L/366 ci | 8.2 L/502 ci | 6.3 L/383 ci |
| Horsepower | 432 | 425 | 330 | 375 | 425 | 375 |
| Torque | 468 | 430* | 380* | 400 | 470* | 450 |
| Compression Ratio | 9:4:1 | 8:75:1 | 8:6:1 | 9:6:1 | 8:8:1 | 9:0:1 |
| Weight | 640 lb. | 1130 lb. | 980 lb. | 780* lb. | 1200 lb. | 930 lb. |
| Alternator | 120amp | 65amp | 95amp | 70amp | 65amp | 65amp |
| Fully Forged Assembly | Yes | No | No | No | No | No |
| Available in Carb or EFI | Both | EFI only | Carb only | EFI only | Carb only | Both |
| Fresh Water Cooled | Yes | Yes | Extra $999 | Yes | Extra $999 | Extra $999 -$3,000 |
| Reverse Rotation | Yes (same cost) | No | No | No | No | Extra $999 (carb only) |
| Warranty | 2 year Full, 5 year Parts. | 3 year Limited | 2 year Full | 2 year Full | 1 year Limited | 3 year Limited |
| Price | Carb: $10,500 EFI: $12,000 |
$23,000 | $12,800 | $21,000 | $16,700 | Carb:$14,600 EFI: $17,200 |
*Numbers estimated from OEM data, not manufacturer provided.
Sample Repower Gains with Medusa 400
| Boat Model Original Engines Weight |
Performance with Original Engines | Performance with Medusa 400 Engines | ||
|---|---|---|---|---|
| At Max Speed | At Cruise Speed | At Max Speed | At Cruise Speed | |
 1990 Wellcraft Portofino 43Mercruiser 454 330 HP 21,000 lbs |
25 mph@4400 rpm 64 gph = 0.39 mpg |
16 mph@3200 rpm 30 gph = 0.53 mpg |
37 mph@5000 rpm 52 gph = 0.7 mpg |
26 mph@3200 rpm 25 gph = 1.05 mpg |
 1973 Bertram 35' ConvertibleCaterpillar 3208, 300 HP 23,000 lbs |
23 mph@2400 rpm 23 gph = 1 mpg |
18mph@1600 rpm 16 gph = 1.12 mpg |
29 mph@4800 rpm 54 gph = 0.53 mpg |
22 mph@3200 rpm 25 gph = 0.9 mpg |
 1969 Chris Craft Commander 47'Detroit Diesel 8V-53, 260 HP 35,000 lbs |
24 mph@2600 rpm 32 gph = 0.75 mpg |
14 mph@1800 rpm 12 gph = 1 mpg |
34 mph@5000 rpm 52 gph = 0.65 mpg |
17 mph@2400 rpm 11 gph = 1.52 mpg |
 1992 Mainship Open Express 36'Crusader 454, 350 HP 16,000 lbs. |
32 mph@4500 rpm 66 gph = 0.48 mpg |
22 mph@3400 rpm 37 gph = 0.6 mpg |
44 mph@5000 rpm 53 gph = 0.85 mpg |
28 mph@3000 rpm 19 gph = 1.47 mpg |
 2014 Sundancer 370Mercruiser 8.2 Mag 380 HP 19,000 lbs |
44 mph@4800 rpm 65 gph = 0.65 mpg |
27 mph@3500 rpm 28 gph = 0.98 mpg |
48 mph@5000 rpm 51 gph = 0.95 mpg |
29 mph@3400 rpm 24 gph = 1.21 mpg |