HPI Racing Nitro Star F3.5 V2 Engine – 3.5cc Race-Legal Big-Block Nitro with Pull Start

Overview

The HPI Racing Nitro Star F3.5 V2 Engine is a powerful 3.5cc (.21-class) big-block nitro engine designed for drivers who want strong acceleration, high top speed, and race-legal performance straight out of the box. Featuring updated internal and external design improvements, the V2 version delivers better cooling, reduced weight, and improved reliability for both racing and high-performance bashing.

This engine uses a rear exhaust layout and a slide carburetor, making it compatible with a wide range of 1/8 scale nitro buggies and truggies. The pull-start system incorporates a durable one-way bearing housed in a reinforced 14mm hex, ensuring dependable and easy starting.

Key Features

• Updated V2 crankcase and heatsink design
• Larger heatsink fins for improved cooling
• 22g lighter than previous version
• 4mm taller profile for enhanced airflow
• Rear exhaust configuration
• Tough pull starter with reinforced one-way bearing
• True ABC construction (chrome-plated brass piston/cylinder)
• Slide-type carburetor with two-needle adjustment

Performance Benefits

• Approximately 2.5 horsepower output
• Explosive acceleration and strong mid-range power
• High top-end speed capability
• Race-legal .21 displacement
• Improved cooling efficiency
• Reduced fuel vaporization with composite carb

Usage Notes

• Best Used With RC Scale(s): 1/8 scale nitro buggies and truggies
• Engine supplied fully assembled with pull start installed
• Exhaust system, clutch, flywheel, and glow plug not included
• Proper break-in required before full-power operation
• Compatible with standard .21 engine mounts and exhausts

Technical Specs

• Manufacturer: HPI Racing
• Part Number: 111600
• Displacement: 3.5cc
• Engine Class: .21 (race-legal)
• Power Output: ~2.5 HP
• Configuration: Big-block, rear exhaust
• Carburetor: Slide type, two-needle
• Internals: True ABC (chrome-plated brass)
• Starting System: Pull start with one-way bearing

What's Included

• 1x HPI Racing Nitro Star F3.5 V2 Engine with Pull Start

Summary

Race-legal .21 big-block performance with V2 design improvements — the HPI Racing Nitro Star F3.5 V2 delivers serious nitro power for 1/8 buggy and truggy builds.