VTI Bottom-End Kit 2000 Twin Spark – 8V

Description

Developed in collaboration between VTI Engineering and top Italian manufacturers

The High-Performance Bottom-End Kit combines precision-machined pistons and advanced liners with engineered throats for superior heat dissipation. Designed in partnership with leading Italian suppliers, this system delivers measurable performance gains, increased thermal stability, and enhanced durability under extreme conditions.

Displacement Options (Stock Stroke Assumed)

• 84.0 mm (Stock bore) → 100% displacement, 148 HP baseline.
• 85.0 mm bore → ~+2.4% displacement → +4–5 HP gain (before compression increase).
• 86.0 mm bore → ~+4.9% displacement → +6–8 HP gain (before compression increase).

Displacement increase directly improves torque across the midrange, sharpening throttle response and drivability.

Compression Ratio Options & Expected Power Gains

Compared to the stock 9.0:1 setup:

• 10.5:1 CR → +4–5% power
• 11.0:1 CR → +6–8% power
• 11.5:1 CR → +10–11% power

When combined with bore increases:

(Figures assume proper ECU/Carbs calibration and does not takes into account camshafts tune. Final results may vary depending on intake, exhaust, and fuel quality.)

Key Engineering Features

• 20% narrower intake skirt → reduced reciprocating mass, improved throttle response.
• Engineered compression decay after TDC → optimized combustion gas flow and efficiency.
• 40% reduction in exhaust skirt loading → superior wear resistance and longevity.
• Liners with precision throats → optimized surface geometry for enhanced heat dissipation, ensuring stability under high compression.

Complete Kit Contents

• High-performance pistons (with rings, pins, wire locks).
• VTI-engineered liners, available in 84 / 85 / 86 mm bores.
• Reinz head gasket and full engine gasket kit.
• Rod and main bearings (standard + oversize options).
• Iwis race/street chains, thrust washers, lock tabs, and full hardware kit.

Recommendation: To fully exploit the increased displacement and compression ratios, pair this kit with the VTI High-Performance Camshaft and cylinder head kit.

Optimized valve timing and lift further increase volumetric efficiency, allowing the engine to reach the full potential of 210+ HP with the 86 mm / 11.5:1 setup.