The phrase "a petrol engine" is correct and usable in written English.
It can be used when referring to an engine that runs on petrol (gasoline), typically in the context of vehicles or machinery.
Example: "The new model features a petrol engine that offers better fuel efficiency than its diesel counterpart."
Alternatives: "a gasoline engine" or "a gas engine".
The DiesOtto engine, as Daimler has called it, starts as a petrol engine with spark plugs igniting the mixture of fuel and air in its cylinders, and remains as a petrol engine when high performance is needed.
Today's fuel cells cost about $5,000 per kilowatt to make, whereas a petrol engine costs about $50 per kilowatt.
This is to provide the driver with the familiar sensations he would expect from a petrol engine.
Diesel cars are three times more likely to break down than those with a petrol engine, according to research.
An electric car in Britain today, for instance, produces around 20% less in CO2 emissions than a car with a petrol engine.
But over the course of the project this target was raised to 100%, at which point it became clear that tweaking a petrol engine would not suffice.
Each episode features May in a workshop, faced in the first instalment with 331 parts of a petrol-engine lawn mower.
May will next be seen on the BBC in The Reassembler, a BBC4 series in which he is filmed putting things back together after they have been taken apart, beginning with the 331 components of a petrol-engine lawnmower.
Indeed, if a petrol-engine vehicle is "underpowered" (for the load transported) then it is more likely to go into "enrichment mode" that produces higher carbon monoxide (CO) levels [ 16].
One type of plug-in hybrid, often referred to as a range-extended EV, is essentially an electric car with a small petrol engine that acts as an on-board generator.
But the Prius is a "hybrid-electric vehicle", or HEV, which mates a conventional petrol engine with an electric motor.
