Continental IO-520-BB Engine – For Beech Bonanza, Navion, and T34 Mentor

The Continental IO-520-BB is the current production replacement for the IO-520-B and IO-520-BA. It is a fuel-injected, air-cooled, six-cylinder engine producing 285 horsepower, and is widely recognized for its smooth operation, reliability, and suitability for high-performance airframes.

Most commonly installed in Beechcraft Bonanza models F33A, A36, and V35B, the IO-520-BB is also compatible with the Navion Model H, T-34 Mentor, and Bonanza C33. Whether you’re upgrading a legacy installation or replacing a timed-out engine, Air Power can help you configure the IO-520-BB precisely to your aircraft’s electrical, ignition, and cooling system requirements.

Aircraft Applications

• Beechcraft Bonanza F33A, V35B, A36
• Navion Model H
• Beech Bonanza C33
• Beechcraft T-34 Mentor

Engine Specifications

• Power: 285 HP @ 2700 RPM
• Displacement: 520 in³ (8.5 L)
• Fuel System: Continental continuous-flow fuel injection
• Cooling: Air-cooled
• Configuration: Horizontally opposed, 6-cylinder
• Compression Ratio: 8.5:1

What We Need to Know to Properly Spec Your Engine

• Aircraft make and model
• Magnetos: Retard breaker or impulse coupling?
• Electrical System: 12 volt or 24 volt?
• Alternator: What amperage do you require (e.g., 60A, 95A)?
• Tachometer Drive: Electrical or mechanical?
• Air Conditioning: Is it installed on your aircraft?

Continental RFQ Process

If your aircraft requires a less common spec or installation-specific variant, Air Power will submit a Request for Quote (RFQ) to Continental Aerospace Technologies on your behalf.

• Typical turnaround: 5–7 business days
• Result: You’ll receive pricing, lead time, and configuration confirmation

Why Buy from Air Power?

Air Power is the largest global distributor of Continental aircraft engines and the manufacturer’s preferred engine supplier. Our engine specialists will guide you through each specification to ensure a perfect match for your aircraft’s systems and mission profile.

Request your quote today and let our experienced engine team walk you through every detail.