The phrase "allow the engine to" is correct and usable in written English.
It can be used when discussing the functionality or operation of an engine, typically in technical or instructional contexts.
Example: "To optimize performance, you should allow the engine to warm up before driving."
Alternatives: "permit the engine to" or "let the engine".
The drivetrain computer will not allow the engine to operate beyond its red line.
And having less inertia, they allow the engine to spin faster and more freely, which also boosts efficiency.
The free-piston design can also allow the engine to be instantly optimized for different fuels, such as hydrogen, natural gas, ethanol, gasoline, and diesel.
Electric assists disable the anti-theft system, unlatch the doors, heat the recontoured bucket seats, secure the rear hatch, raise and lower the convertible top and allow the engine to be started at the punch of a button.
To allow the engine to be mounted lower -- reducing a vehicle's center of gravity, improving handling and cutting the risk of a rollover -- engineers ran part of the front driveshaft right through a passage in the oil pan.
Integral to the main chamber is a coolant jacket through which liquid propellant (usually fuel) is circulated at rates high enough to allow the engine to operate continuously without an excessive increase of temperature in the chamber.
Despite the extra forward ratios, which allow the engines to spin more efficiently, fuel economy does not show great gains over the 2013 model, with the 2-litre coming in at 23mpg in city and 31mpg in highway driving.
Honda engineers said that allowing the engine to go to four cylinders significantly increased the chances that the V-6 could run on fewer than six; quite often, three just weren't enough even when six were more than needed.
Finally, this approach allows the engine to display the results in various innovative ways.
Allowing the engine to cool usually enables the vapour to recondense and thereby clears the vapour lock.
The clutching mechanism allows the engine to shut down when not needed, as when slowing for a stoplight or cruising.
