The phrase "engine supplier" refers to a company or entity that provides or sells engines to another company or individual for use in various machines or vehicles. Full definition
The gasoline engine supplies 95 horsepower and 105 pound - feet of torque and the electric motor adds 71 horsepower and 120 pound - feet of torque to the mix. (cnet.com)
Once it is confirmed the take rate is justified, we need to find engine supply. (fourwheeler.com)
Renault returned as engine suppliers in 2012 and the team were back on the top step of the podium within five races, Pastor Maldonado winning in Spain. (racefans.net)