LS Engine Swap in Airplanes: Risks, Cost & Performance

Bottom Line

Enthusiasts are putting Chevy’s LS small‑block into airplanes, but the swap brings safety, certification and cost challenges that make it far from a plug‑and‑play upgrade.

Design & Looks

The LS engine is famous for its compact V8 shape and aluminum heads. Swapping it into a classic Piper or experimental aircraft gives the plane a sleek, automotive look—exhaust pipes that echo a sports car and a front cowl that resembles a muscle‑car hood. Builders often fabricate custom mounts and cowling to hide the differences.

Performance & Mileage

On the road an LS can push 400 hp and sip about 12–15 mpg. In the air the numbers change. Pilots report cruise speeds 20–30 knots higher than a comparable Lycoming, but fuel burn jumps to roughly 8–10 gph, which translates to about 8–10 mpg‑equivalent. The power boost comes at the price of higher heat and the need for an oil‑cooling system that meets aviation standards.

Price & Rivals

A brand‑new LS engine costs between $5,000 and $8,000. Adding aircraft‑grade components—prop‑reduction gearbox, aviation‑certified fuel pump, custom mounts—pushed the total to $12–15 k. Traditional aircraft engines like the Lycoming O‑320 sit around $9–10 k, making the LS swap a premium option for hobbyists who want extra horsepower.

FAQ

• What is the fuel consumption of an LS‑powered aircraft? Expect about 8–10 gallons per hour, roughly 8–10 mpg‑equivalent at cruise.
• Is swapping an LS engine into a plane legal? Only if the aircraft is experimental and the builder follows FAA 21‑22 rules; certified aircraft cannot use non‑approved powerplants.
• Does the LS swap improve performance? Yes, it adds 20–30 knots of cruise speed, but the higher fuel use and added weight offset some benefits.

What do you think about putting a car engine in a plane? Share your thoughts below.

Source: Read Official News