VTI Engine Package – Twin Spark 8V – Full 2.050+ cc Conversion and up to +65 BHP

Description

Developed in collaboration with VTI Engineering and top Italian manufacturers

This high-performance bottom-end kit has been developed for the Alfa Romeo 2000 Twin Spark engine, offering forged pistons, precision-engineered liners, high-grade bearings, IWIS timing chains, and Reinz gaskets. It provides the durability and performance foundation required for fast-road, track-day, and full competition use.

Engineering Basis

• Engine base: Alfa Romeo 2000 Twin Spark (original bore × stroke: 84 × 88.5 mm, displacement 1,962 cc).
• Bore options:
  • 84 mm (standard) → 1,962 cc
  • 85 mm → 2,009 cc
  • 86 mm → 2,056 cc
• Compression ratio options:
  • 10.5:1 – suitable for 91–93 octane fuel
  • 11.0:1 – optimized for premium fuels
  • 11.5:1 – for maximum performance with high-octane competition fuel
• Geometry considerations:
  • Stock 2000 TS is undersquare (stroke > bore).
  • Increasing bore to 85 mm and 86 mm shifts the design closer to square geometry, improving breathing and rpm potential.
  • The twin-spark head design already improves combustion efficiency compared with Nord engines, so higher compression and rpm can be used effectively.

Piston and Liner Engineering

• 20% narrower intake skirt reduces friction and improves throttle response.
• Controlled compression decay after TDC enhances combustion stability and gas flow.
• 40% reduction in exhaust skirt load ensures long-term durability under high loads.

Kit Contents

• Forged pistons with conventional rings, standard pins, and wire locks.
• Precision-engineered liners.
• High-Performance Connecting Rods
• Reinz head gasket and full engine gasket set.
• Standard rod and main bearings (oversize options available).
• IWIS race/road timing chains (top and bottom).
• Thrust washers, lock tabs, and complete hardware kit.
• Camshafts
• Intake and Exhaust Valves
• Valves Guides
• Valves Springs
• Timing Pulley
• Full Gasket Kit
• Carburettors Mounting
• Sport Sparks
• Sport Flywheel
• Sport Horns
• Valves Seals

Performance Potential

Stock Baseline (84 mm bore, ~9.5:1 CR, Bosch injection)

• ~148–150 hp @ 5,800–6,000 rpm
• Usable rpm range: up to ~6,500 rpm

With Kit – 84 mm bore (1,962 cc), 10.5–11.5:1 CR

• Fast-road build: 160–165 hp @ ~6,800 rpm
• Race build: 175–180 hp @ ~7,200 rpm
• RPM ceiling: ~7,200 rpm

With Kit – 85 mm bore (2,009 cc), 10.5–11.5:1 CR

• Fast-road build: 165–170 hp
• Race build: 178–185 hp
• RPM ceiling: ~7,300 rpm
• Advantage: extra displacement and improved bore/stroke ratio, supporting larger valve area and higher airflow

With Kit – 86 mm bore (2,056 cc), 10.5–11.5:1 CR

• Fast-road build: 168–173 hp
• Race build: 180–190 hp
• RPM ceiling: ~7,400–7,500 rpm
• Advantage: near-square geometry, maximum displacement and improved breathing; allows high rpm while retaining torque

Figures assume sport or race camshafts, ported cylinder head, high-flow intake, and stainless-steel 4-2-1 exhaust headers (+10 hp typical gain).

Advantages of Approaching Square Geometry

• Higher rev potential: reduced mean piston speed allows reliable operation at 7,500 rpm in race trim.
• Improved volumetric efficiency: larger bore accommodates bigger valves and supports better cylinder filling at high rpm.
• Balanced performance: preserves the 2000 TS’s strong mid-range torque while extending top-end output.
• Optimized combustion: twin-spark design with higher compression improves flame propagation and efficiency at all rpm.

Summary

This bottom-end kit provides the Alfa Romeo 2000 Twin Spark engine with the structural strength and performance capacity required for modern fast-road and motorsport applications. With bore enlargement up to 86 mm and compression ratios up to 11.5:1, the engine can be tuned from its stock ~150 hp into a 165–173 hp fast-road specification or up to 220 hp in full race trim.

Approaching square geometry enhances rpm stability and top-end performance, while forged pistons, precision liners, IWIS chains, and high-quality bearings ensure reliability. This is the ultimate solution for builders and drivers seeking to fully exploit the potential of the Alfa Romeo Twin Spark platform.

Here’s the updated comparison chart with all four classic Alfa Romeo Twin Cam engines (1300, 1600, 1750 Nord, 2000 Nord) plus the 2000 Twin Spark, including bore options, displacement, compression ratio ranges, estimated horsepower, rpm ceilings, and geometry notes.