| Vessel Make: | Precision 50 |
|---|---|
| Vessel Weight: | 25T |
| Old Engine: | 2 x Detroit 6V92 |
| Old Engine Rating: | 550HP @ 2,300rpm |
| New Engine: | 2 x FPT Cursor 9 650 |
| New Engine Rating: | 650HP @ 2,530rpm |
| Weight Difference: | FPT engines: 283kg lighter |
| Speed Difference: | Max: 26.5 knots (up 5.5 knots) |
From Classic Detroit 6V92 Power to Modern FPT Performance
The Precision 50 is a well-known, capable platform, but like many of its kind, it was still running legacy marine engines that no longer suited modern boating in Australia.
The Detroit 6V92s
This vessel was originally powered by twin Detroit 6V92 2-stroke marine engines.
Let’s be honest – They’re iconic engines:
- They sound incredible at full throttle
- They’ve got character
- And they’re undeniably cool
But…
Cool doesn’t pay the bills. Smart does.
These engines were:
- Large, heavy, and outdated
- Extremely wide – taking up valuable engine room space
- Rated at 550HP @ 2,300rpm (per engine)
- 9.05L V6 displacement
- Paired with Allison gearboxes (SAE2 bellhousing – limited support today)
- Known for burning more fuel than you could put in the tank
Despite one engine receiving a partial overhaul (liners and pistons), ongoing reliability concerns remained – and within 6 months, the decision was made to move on.
These engines were simply:
No longer suited to the way Australia use their boats today.
The Solution: FPT Cursor 9 650
We repowered the Precision 50 with twin FPT Cursor 9 marine engines, delivering:
- 650HP @ 2,530rpm (each) – That is 1300HP total output!
- 8.7L inline-6 displacement
- 2,220Nm of torque at 1,750rpm
- Digital display panels showing: RPM, Oil pressure and temperature, Fuel data, Alarms and safety systems
Key Advantages – Size and Space
While similar in length, the inline-6 design drastically reduced width:
- Old Detroit 6V92: 1,168mm wide (per engine)
- New FPT Cursor 9 650: 863mm wide (per engine)
That’s 305mm extra space per engine
This transformed the engine room, improving accessibility, serviceability, and overall layout.
Weight Reduction
The FPT Cursor 9s are 940kg dry weight, making them 283kg lighter per engine = Over half a tonne removed from the vessel.
This directly contributed to:
- Better performance
- Reduced load on the vessel
- Improved fuel efficiency
We also installed brand new ZF gearboxes behind the FPT Cursor 9 650 marine engines, as the Allison gearboxes have no support or parts availability. But we retained the existing exhaust system, redesigned into a clean single exhaust setup.
Throttle Upgrade: Flexball System
We upgraded from traditional Morse cable controls to Flexball electronic throttle control systems, the Tournament levers.
- Instant electronic response (engine + gearbox)
- Smoother gear engagement
- Ability to sync both engines to one lever
- Rear-facing control – perfect for game fishing setups
The Results
At sea trial, the transformation was immediate. The Precision 50 now cruises comfortably at 20 knots @ 2,150rpm. A solid jump from its previous performance of 17.5 knots, and achieved it with far less effort from the engines.
The biggest win? Fuel efficiency. Consumption dropped from 170L/h down to 120L/h combined. Delivering roughly a 30% fuel reduction while gaining speed. Less fuel, more performance – exactly what a repower should deliver.
Top-end performance also saw a major lift. The vessel maximum speed increased from 21 knots to 26.5 knots, with further gains expected once prop optimisation is complete, pushing towards 28 knots.
Lighter, faster, and significantly more efficient. This Precision 50 now performs the way it always should have.
More speed.. Less fuel. Better reliability… Your Repower Starts Here.
Contact us today – (08) 9344 4844 or info@thtsales.com.au
