[jcoby]

> They lack a bunch of emissions control equipment like fuel injection, catalytic converters, and the like.

Yeah unfortunately the weight and size of those systems is prohibitive for most light aircraft. Plus catalytic converters and oxygen sensors for closed loop efi can’t be used with leaded fuel.

> They are 60's or maybe 80's car engines that are still made since nobody in GA wants to pay for better ones.

The Lycoming and continental engines in most of the fleet were certified in the early 50s. A few were in the early 60s. That means they were designed in the 40s and 50s!