Engine Components International, Inc. (ECI) is a private aviation piston engine manufacturer.[citation needed] It was founded in 1943 as Pennington Channelcromium Co. to support the Army Air Force and Navy during World War II.

ECi certified its Quality Management System to the ISO 9001:2000 international standard and AS9100 aerospace standard. Recertified to the ISO 9001:2000 standard in Feb 2008.
| Model name | First flight | Number built | Type |
|---|---|---|---|
| ECi O-320 | Number built | Certified 154-167 hp | |
| ECi OX-320 | Number built | Experimental 154-167 hp | |
| ECi IOX-320 | Number built | Experimental 156-169 hp | |
| ECi O-340 | Number built | STC Certified 175-180 hp | |
| ECi OX-340 | Number built | Experimental ATSM Certified 180 hp | |
| ECi O-360 | Number built | Certified 175-189 hp | |
| ECi OX-360 | Number built | Experimental 175-189 hp | |
| ECi IOX-360 | Number built | Experimental 178-192 hp | |
| ECi OX-370 | Number built | Experimental 192 hp | |
| ECi IOX-370 | Number built | Experimental 205 hp | |
| ECi IOX-409 | Number built | Experimental 230 hp | |
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