Superior XP-320 Engine


Power your SPA Aircraft with a Superior Experimental XP-320 Engine!

Each factory new XP-Engine is created from the most advanced designs and manufacturing techniques then individually hand assembled by experienced engine craftsmen using many of the same FAA certificated parts used to build the FAA certificated Vantage Engine.

The components used to create Superior’s XP-Engines are the culmination of literally hundreds of individual design and manufacturing improvements we have made to our array of FAA PMA-approved parts and components over the last 40-plus-years.

Today, the fit, finish and quality of all of Superior’s parts and components are of the highest possible quality and consistency. The parts and components are not painted or alodined to hide blemishes or manufacturing shortcomings. The only reason they paint our Millennium Cylinder barrels or Alodine finish on the cylinder heads, crankcases, sump, cylinder heads and assembly drives on the XP-Engine is for corrosion protection.

Why? The reason is simple: they have the best looking parts in the business and they don’t have to cover up any manufacturing flaws with paint.

The obvious quality of the XP-Engine is just the beginning of the many performance and quality advancements it brings to piston-powered, experimental aircraft and helicopters.

See more information from Superior HERE

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Displacement – 320 cubic inches

Max Continuous Brake Horsepower:  160 hp/119 kw standard, 150 hp/112 kw available, 165 hp/123kw available

Compression ratio:  8.5:1 standard, 7:1 and 9:1 available

Oil Capacity:  8.0 Qt. Max/2.5 Qt. Min (7.6 Ltr. Max/2.4 Ltr. Min.)

Ignition:  Dual impulse magnetos standard

Engine Mount Type:  Conical

Propeller Drive:  Direct AS172 Type 2 Modified

Propeller Type:  Fixed Pitch


O-320 – 276 pounds (125 kg)**

IO-320 – 283 lbs (128 kg)**

Fuel Types:  100 LL Avgas or 91 octane automotive gasoline*


  • fuel pump
  • fuel system
  • magnetos
  • harness
  • spark plugs
  • lightweight starter
  • oil filter adapter
  • oil filter and updraft cast sump

*NOTE:  Superior XP-320 Engines are approved for 100LL Avgas per ASTM D9910, 91/98 (lead optional) and motor gasoline with a minimum antiknock index (R=M/2 method of 91 per ASTM D4814 (European EN228).  Use of auto fuel blended with alcohol (ethanol) is forbidden.

**Approximate dry weight.  Actual weight varies by model.

Additional information

Engine Model

Carbureted, Fixed Pitch O-320-A1AC2, Fuel Injected, Fixed Pitch IO-320-A1AC2


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