Continental IO-520-E Engine – For Cessna 310, Beech Baron, and More

The Continental IO-520-E is a fuel-injected, 285 horsepower engine built for multi-engine and high-performance single applications. Most commonly found on Cessna 310 and Beech Baron aircraft, it is also installed as part of Colemill conversions for the Aero Commander 500A and has been used in aircraft such as the Primair De Havilland Heron.

Every IO-520-E engine from Air Power ships with a Tempest Spin-On Oil Filter (when applicable) and a complete set of Tempest Spark Plugs, standard at no extra cost.

Aircraft Applications

• Cessna 310
• Beech Baron (E Series, select earlier models)
• Aero Commander 500A (Colemill Panther Conversion)
• Primair De Havilland Heron

Engine Specifications

• Power: 285 HP @ 2700 RPM
• Displacement: 520 cu in (8.5L)
• Fuel System: Continuous-flow fuel injection
• Cooling: Air-cooled, horizontally opposed
• Configuration: 6-cylinder

What We Need to Know to Properly Spec Your Engine

The IO-520-E has multiple configurations—selecting the correct one for your aircraft is essential. Please provide the following when requesting a quote:

• New or rebuilt?
• Aircraft make and model
• Magneto type: Impulse coupling or retard breaker mags?
• Alternator: Included or not?
• Oil Cooler Type: 7.88" or 8.88" decongealing oil cooler?
• Oil Sump Drain Location: On left side or bottom of sump?

Continental RFQ Process

If your configuration isn’t one of the commonly stocked engine specs, Air Power will submit a Request for Quote (RFQ) to Continental Aerospace Technologies. This ensures precise matching and accurate pricing.

• Turnaround time: 5–7 business days
• Includes: Lead time, price, and factory-confirmed spec review

Why Buy From Air Power?

As the largest global distributor of Continental engines and Continental's preferred provider, Air Power brings unmatched knowledge, inventory access, and support. We ensure every IO-520-E engine is correctly configured and shipped with OEM-backed reliability and warranty.

Get your quote today and let our engine specialists handle the complexity for you.