The phrase "a key engine for" is correct and usable in written English.
It can be used to describe something that plays a crucial role in driving or facilitating a particular process or outcome.
Example: "Innovation is a key engine for economic growth in today's competitive market."
Alternatives: "a vital driver of" or "an essential catalyst for".
Economic research has identified innovation as a key engine for economic growth, competitiveness and employment.
Darling rightly identified small businesses as a key engine for growth and unveiled measures to ease their tax burden and improve access to finance.
Any sharp weakening in China, which has become a key engine for global growth, would be unwelcome news for the rest of the world, especially at a time when the United States and Europe are struggling to reduce heavy debt loads and high unemployment levels, and as Japan is still grappling with the aftermath of the earthquake and tsunami.
Pitchfork has been a key engine for identifying and nurturing any number of baby movements, feeding them until they can stand up on their own, in the hope of producing a few acts that can perform at this festival, which has something of a symbiotic relationship with the Web site, each validating the existence of the other.
China is a key engine for global economic growth, so any signs of economic weakening there can send shivers through investors.
It points to early investment in mobile as a key engine for growth, with €1 in every €3 spent via its mobile apps in Spain, while in Mexico the figure rises to more than 40% of sales — and up to 60% during holiday dates.
The phenomenon is fairly recent, but has picked up rapidly in the past few years as Asia's appetite for industrial, consumer and luxury goods has emerged as a key engine of growth for Western companies struggling at home.
The BPI is right to pinpoint streaming as a key engine of growth for the music industry, but it remains to be seen which companies have the legs to make that growth sustainable in the longer term.
This is a concern because academisation is the government's key engine for school improvement.
The Chinese government has blocked YouTube and SoundCloud, two key engines for increasing exposure for artists and listeners who would otherwise be siloed by their location.
Together with co-stimulation from the T lymphocytes (T-cells), naïve B-cells become fully activated and go on to proliferate and differentiate into memory and plasma cells, with the latter serving as the key engines for producing specific antibodies.
