Continental TSIO-520-NB Engine – For Cessna 340, Cessna 414 & Mooney Rocket STC

The Continental TSIO-520-NB is a 310-horsepower turbocharged engine and the current factory production version of the TSIO-520-N. It’s best known for powering the Cessna 340 and Cessna 414, with additional support for select Mooney Rocket Engineering STC upgrades.

This engine combines high-altitude performance with exceptional reliability, and is supported by Continental’s full factory warranty. Whether you are replacing a high-time twin or converting a Mooney to turbo power, the TSIO-520-NB delivers the muscle and altitude capability you need.

Every Air Power-supplied engine includes a Tempest Spin-On Oil Filter (when applicable) and a complete set of Tempest Spark Plugs.

Aircraft Applications

• Cessna 340
• Cessna 414
• Mooney Rocket Engineering STC (Specs 17 & 18)

Engine Specifications

• Horsepower: 310 HP @ 2700 RPM
• Displacement: 520 cu in (8.5L)
• Configuration: Turbocharged, 6-cylinder, horizontally opposed
• Fuel System: Continuous-flow fuel injection
• Cooling: Air-cooled

What We Need to Know to Properly Spec Your TSIO-520-NB

This is one of the most complex engines Continental offers. Please consult your Air Power rep to ensure we configure your engine correctly. You’ll need to confirm the following:

• New or rebuilt?
• Impulse coupling or retard breaker magnetos?
• 12V or 24V electrical system?
• Intercooler: What is your current intercooler part number?
• With or without air scoop?
• Left or right engine position?
• Oil-heated fuel manifold valve installed?
• Hydraulic pump accessory drive required?
• Turbocharger included or not?

Continental RFQ Process

Due to the wide range of possible configurations, many TSIO-520-NB builds require a formal Request for Quote (RFQ) from Continental. Air Power will submit the RFQ on your behalf and return with confirmed pricing and lead time.

• Turnaround: 5–7 business days
• Includes: Confirmed spec, pricing, and delivery timeframe

Why Buy from Air Power?

Air Power is the largest worldwide distributor of Continental engines and their preferred supply partner. Our technical team is trained to walk you through each spec question—especially on challenging configurations like the TSIO-520-NB. We help ensure you order the correct engine the first time.

Contact our team today and get expert help quoting your TSIO-520-NB engine for Cessna or Mooney applications.