Transform your powerboat's performance and reliability with expert engineering upgrades. At Powerboat Restored, we specialize in complex marine engineering projects including inboard-to-outboard conversions, engine upgrades, transom reinforcement, and structural modifications that enhance your vessel's capabilities..

Converting from inboard to outboard power offers significant advantages for many powerboat owners. This complex engineering project requires expertise in structural modification, marine systems, and proper installation techniques.

Why Convert to Outboard Power?Simplified Maintenance

Outboard engines tilt up for easy access to lower units, propellers, and anodes. No engine hatches, no contorting into tight engine compartments. Routine maintenance becomes straightforward, and winterization is simpler.

Improved Fuel Efficiency

Modern outboard engines offer exceptional fuel efficiency compared to older inboard systems. Four-stroke outboards deliver outstanding economy, reducing your operating costs significantly.

Increased Interior Space

Removing the inboard engine and related systems frees up valuable interior space. Engine compartments can be converted to storage, seating, or cabin space, dramatically improving your powerboat's usability.

Better Weight Distribution

Outboards mounted at the transom often improve weight distribution and handling characteristics. Many boats perform better with outboard power, particularly in rough conditions.

Easier Engine Replacement

When an outboard reaches end of life, replacement is straightforward. With inboards, engine removal and installation can be complex and expensive, sometimes requiring deck removal.

Reduced Maintenance Costs

Outboards eliminate through-hull fittings for cooling water intake, shaft seals, stuffing boxes, and complex exhaust systems. Fewer systems mean lower maintenance requirements and costs.

Initial Assessment & Design

We evaluate your powerboat's suitability for conversion, considering hull design, weight distribution, performance expectations, and budget. Not every boat is an ideal conversion candidate, and we provide honest assessments.Our design process includes:

• Structural analysis of existing transom
• Weight and balance calculations
• Engine sizing and selection recommendations
• System integration planning

Transom Reinforcement

Outboard engines create significant loads on the transom. Most boats originally designed for inboard power require substantial transom reinforcement to safely support outboard engines.Our reinforcement work includes:

• Complete transom core evaluation and replacement if needed
• Structural laminate additions using epoxy and fibreglass
• Proper load distribution design
• Engine mounting surface preparation
• Backing plate installation for through-bolted mounting

Inboard System Removal

We carefully remove the existing inboard engine, transmission, shaft, strut, rudder (if applicable), and related systems. Proper removal prevents damage to surrounding structures.Through-hull fittings are properly sealed using marine-grade materials. Former engine compartment spaces are cleaned, refinished, and prepared for conversion to usable space.

Outboard Bracket or Transom Mounting

Depending on your boat's design, we either mount outboards directly to the reinforced transom or install a purpose-built outboard bracket.

Outboard brackets offer advantages:

• Positions engine weight further aft for better performance
• Provides swim platform integration
• Allows larger engines than direct transom mounting
• Improves access and maintenance

Direct transom mounting works well for:

• Boats with sufficient transom height and strength
• Smaller to medium outboards
• Simpler, more cost-effective installations

Engine Installation & Systems Integration

We install your chosen outboard engine(s) with proper alignment and secure mounting. All systems are professionally integrated:

• Fuel system with proper lines, filters, and connections
• Electrical system including battery cables, starting circuits, and instrumentation
• Steering system (hydraulic or mechanical as appropriate)
• Control cables and rigging
• Instrumentation and gauges
• Navigation lights and electrical loads

Testing & Commissioning

Before returning your powerboat, we conduct comprehensive testing:

• Engine running and performance checks
• Full throttle testing and top speed verification
• Handling and maneuverability assessment
• All systems functionality verification
• Water testing for leaks or issues

You receive a converted powerboat ready for reliable service.

Sometimes conversion isn't necessary, but upgrading to modern, more powerful, or more efficient engines transforms your boating experience.

Outboard Engine Upgrades

Replacing older outboards with modern engines delivers:

• Dramatically improved fuel efficiency
• Better reliability and reduced maintenance
• Quieter operation
• Enhanced performance
• Modern features like digital controls and integration

We handle complete outboard repowering including rigging, controls, and systems integration.I

nboard Engine Upgrades

For boats remaining with inboard power, we provide:

• Engine replacement with modern diesel or gasoline engines
• Transmission upgrades
• Shaft and propeller optimization
• Cooling system improvements
• Exhaust system upgrades

Engine Sizing & Selection

Proper engine sizing is critical. Oversized engines waste fuel and money. Undersized engines struggle and wear prematurely. We recommend appropriate power based on:

• Hull design and weight
• Intended use (cruising vs performance)
• Fuel efficiency priorities
• Budget considerations

Transoms endure tremendous stress from engine mounting, torque, and vibration. Deteriorated or inadequate transoms compromise safety and performance.

Signs Your Transom Needs Attention:

• Soft spots when pressing on transom surfaces
• Cracks around engine mounting bolts
• Engine mounting bolts loosening repeatedly
• Visible deterioration or delamination
• Water staining or discoloration
• Flexing when engine is running

Our Transom Reinforcement Services:Core Replacement

Deteriorated core materials (typically plywood in older boats) must be completely removed and replaced with marine-grade materials. We use proper epoxy-saturated plywood or composite core materials designed for marine applications.

Structural Laminate Additions

We add fibreglass laminate layers using epoxy resins to increase transom thickness and strength. Proper laminate schedule design ensures adequate strength for engine loads.

Engine Mounting Reinforcement

Local reinforcement around engine mounting points distributes loads and prevents stress concentrations. Backing plates and reinforcement pads ensure secure, long-lasting engine mounting.

Splash Well & Transom Cap Work

We rebuild or reinforce splash wells, transom caps, and related structures that often deteriorate alongside transoms.

Beyond standard conversions and upgrades, we handle custom engineering projects:

Deck & Cockpit Modifications

• Cockpit layout changes
• Deck hatch additions or relocations
• Seating and console modifications
• Storage integration

Hull Modifications

• Swim platform additions
• Bow pulpit installation
• Rub rail replacement and upgrades
• Through-hull fitting additions for new systems

Performance Enhancements

• Trim tab installation
• Hydrofoil additions
• Propeller optimization
• Weight distribution improvements

Specialized Expertise

Marine engineering requires understanding of structures, systems, and boat performance. Our experience ensures projects are executed properly, safely, and effectively.

Structural Engineering Focus

Pretty modifications that compromise structural integrity are dangerous. We prioritize proper engineering and structural soundness in every project.

Quality Materials & Components

We use marine-grade materials, reputable engine brands, and quality components. Your investment deserves parts designed for marine environments.

Complete Project Management

From initial assessment through final testing, we manage every aspect of your engineering project. You receive a turnkey result ready for use.

Controlled Workshop Environment

Complex engineering projects require proper facilities. Our Devizes workshop provides the space, tools, and environment for quality work.

Collection Service

Engineering projects often require extended time. Our collection service means your boat undergoes professional upgrades without occupying your marina berth.

Engineering projects vary significantly in scope and cost. Factors affecting pricing include:

Inboard to Outboard Conversions:

• Boat size and complexity
• Transom reinforcement requirements
• Engine selection (single vs twin, size, brand)
• Bracket vs direct mounting
• Systems complexity
• Typical conversion investment: £8,000-£25,000+

This includes transom reinforcement, inboard removal, outboard installation, all systems integration, and testing. Engine costs are additional.

Transom Reinforcement (without conversion):

• Extent of deterioration
• Access requirements
• Size of transom
• Cosmetic refinishing needs

Typical investment: £2,500-£8,000+Engine Upgrades:

• Engine selection and quantity
• Installation complexity
• Systems integration requirements
• Existing equipment removal

Typical investment: £3,000-£15,000+ (plus engine costs)

Request a Detailed Quote:Contact us via WhatsApp with details of your powerboat and desired upgrades. We'll discuss your goals, assess feasibility, and provide a comprehensive quote.For complex projects, we recommend collection for in-person assessment before providing final pricing.

Timeline Considerations

Engineering projects require proper time:

• Inboard to outboard conversions: 4-8 weeks typically
• Transom reinforcement: 2-4 weeks
• Engine upgrades: 2-6 weeks depending on complexity

Rushing compromises quality. We provide realistic timelines and keep you updated throughout the project.

Off-Season Advantages

Winter is ideal for major engineering projects. Your boat isn't in use, and spring launch reveals a transformed vessel ready for the season.

Financing & Budgeting

Major upgrades are significant investments. We provide detailed quotes so you can plan accordingly. The improved performance, reliability, and reduced maintenance often provide excellent long-term value.

Ready to transform your powerboat's performance and reliability?

Contact us via WhatsApp to discuss your engineering upgrade needs.We collect powerboats from any marina across Wiltshire, Somerset, Dorset, Hampshire, and Devon for professional engineering work in our specialized workshop.Serving powerboat owners across Devizes, the Solent, South Coast, Bristol Channel, and surrounding areas.