The 2172cc engine is linked to twin overhead camshafts and carburetors.
The cylinder head has 16 valves. Those models that are designed for road use come with a power threshold of 155bhp and a compression ratio of 9:4:1. Engines that are meant for competitions are the ones that come with the 234bph upgrade. Later on, this scale was increased even more. This is how the 48mm carburetors which had an 11:1 compression ratio came about.
The engine's efficiency was further enhanced by the re-building task that Talbot embarked on in order for unique components to be delivered for special use by the Lotus Sunbeam maker. The racing-type engine was required to meet the homologation rules set by the federations that monitor racing competitions.
Lotus were also part of the plan to develop and produce the engine. The company did not merely design and manufacture the engine; it had to develop exhaust and suspension systems as well. This is why rolling chassis were built in Linwood. It is also here that they had to be fitted into the engine's 5-speed gearbox. For these reasons, the Lotus Sunbeam's engine was unique and performed very well in situations where a lot of power was needed such as during motoring competitions.