In 1951, a 4 1⁄2-litre, 4.6 L (4,566 cc/278 cu in) version of the engine was introduced.

The increase in displacement was accomplished by increasing the bore from 3 1/2 inch to 3 5/8 inch.

The later version is sometimes casually referred to as the “big bore” engine, the earlier version as the “small bore” version.

The 4 1/2 L version of the engine is as well equipped with a Vokes 30 (later: Vokes 62) full flow oil filter (some earlier 4 1/4 L cars have since been modified to a full flow filtration system).

Bentley Motors lost no time in race-proving its new car.

It is believed that the first prototype engine went into the 3-Litre chassis of the 1927 Le Mans practice car.

As Bob Gathercole the Godson of W.O. once said, “The use of modern technology where necessary for compatibility with modern traffic is a logical progression that my Godfather W.O. Bentley would certainly have approved of”.

The car on sale today, UR6341, has been designed as an authentic replica similar to UR6571...