The Continental Tiara series are a family of air-cooled, horizontally opposed aircraft engines.

Designed and built by Continental Motors/TCM, the Tiara series were commercially unsuccessful, costing the company millions of dollars.

Faced with having to fund the production tooling for the T65 in order to keep the price reasonable, or funding the Tiara series, Continental's corporate management chose to invest in the Tiaras.

[2] While the Tiara series were basically traditional boxer engines, they did have some unique features.

The engines' fuel consumption was high, which became a disadvantage during the 1973 oil crisis era.