Reliability would be my first concern. Power to weight is likely an issue as well. Here is some more info I found: https://www.flyingmag.com/aircraft/do-car-en

Reliability would be my first concern. Power to weight is likely an issue as well. Here is some more info I found: https://www.flyingmag.com/aircraft/do-car-engines-make-good-airplane-engines/ https://www.flyingmag.com/aircraft/do-car-engines-make-good-...