is this OU internal combustion engine?

[seychelles]

IF ONE EXTRACT MOST OF THE HEAT FROM THAT MOTOR AND STEAM IT THROUGH A TURBINE
GENERATOR, THEN MAYBE 80 PERCENT.

[lancaIV]

Hi lancaIV!
But I wanted mention to internal combustion engines only!

First statement : 1975 the combustion engine efficient max. were for gasoline engines +/- 30 % and for gasoil engines 35% max. :installed in cars you came down from this max. to real
https://worldwide.espacenet.com/publicationDetails/description?CC=US&NR=4318449A&KC=A&FT=D&ND=3&date=19820309&DB=EPODOC&locale=en_EP#

                                                                        "...... 2-5% .... "

                                                                 power-to-wheel ratio

                         
Compare the 40% efficiency with fuel cell peak/average efficiency and you get similar values  !
http://www.proepowersystems.com/PROEHOME.HTM

To get an " overunity " combustion engine you not only would need a waste heat recuperator but would also to close the actually open combustion cycle = exhaust and use water as fuel  for hydrolysis to hydrogen and reformate with oxygen to water !
Also with heat recuperation you actually "only" get +/- 55% efficiency max.,

improvement trial in laboratory work :
https://newatlas.com/wave-disc-generator-combustion-engine/19394/
https://m.youtube.com/watch?v=uf_-IMgla34
Alternatively " Near Unity : 94% " :
https://www.wwf.org.au/news/blogs/zero-emissions-engine-is-a-perfect-10

And when this combustion engine makes part from a moving  vehicle the waste kinetic power recuperation for example by flywheel ! The total vehicle body makes part from the ex-/ in-ternal combustion cycle !

So began the "automobile"-story in the 17' century : a 4-wheeled vapor machine constructed by an Jesuit from the Netherlands.

From un-manned automobile beginnings to - telemetrical controled- unmanned moving vehicle future  !
Military and ware delivery perspective ! Land,sea and air.