"two engines" is a correct and usable phrase in written English.
You could use it to describe a car, for example: "This car has two engines, one in the front and one in the back."
The new A4 offers two engines.
Aeroplanes are always safer with two engines than with one.
The two engines drove Aston Martins through 1972.
There are two for each of the plane's two engines.
Buyers can choose among three versions, two engines and two roof configurations.
There are two engines, a 2.0 and a 3.0, each available with two power outputs.
The Defense Department initially ordered two engines for the new fighters, made by different manufacturers.
It had two engines, and each one would have cost about $15,000 to replace.
Hybrids are a little more costly to buy because they have two engines – electric and petrol.
Despite the captain's assurances that it was nothing, the two engines soon began shooting flames.
Even planes with only two engines are perfectly able to fly with just one.
