green engine

How many "green engines" are not internal combustion engines? (Extra credit if you can mention the one key class.)

According to those that know,

Volvo Red block engines are bullet proof

Ford Cleveland Black blocks were the ducks nuts

Holden Red and Blue motors were pretty good too.

Cat motors are yellow so you can find them in the dark but you can't kill them with a stick.

Detriots are silver and they go pretty hard.

So no, green motors are not better than ones that are other colours....

John Deere farm equipment engines are green and some where known for catching themselves on fire too so does they count as a green external combustion engines?

Funny but that's been my experience of John Deere stuff.

In the quarry it was christened Oh Deere

It would be more useful if the heat in exhaust gases could be used to warm space in winter and to run air conditioner/refrigerator in summer by running a turbine or connecting to a generator to charge battery(ups)