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... 3 JpFEI^UNIT The very modern overhead camshaft design and the use of aluminium has given this 875 cc„ unit outstanding qualities of high efficiency and economy* The use of aluminium saves every ounce of weight and offers a host of advantages from the point of view of the car's handling, performance, servicing and manufacture,, The weight of the Imp engine is only half that of a comparable castiron unit. This means greater economy (after all the transport of every ounce of weight has to be paid for in fuel) and makes the task of engine removal for major overhaul literally as light as possible,, The performance advantages of the use of aluminium, in particular for the cylinder head,, have long been established and another factor is that this material lends itself to high productivity foundry techniques= The advantages, again of the overhead camshaft design have long been displayed on more expensive cars and it enables us to use a very compact and positive valve gear. _QOMHffiSSIQN RATIO. The Imp has a high compression ratio at 10 to 1 and this, of course, is associated with the relatively small bore and the aluminium head, but it can be lowered by the use of alternative pistons in countries where premium fuel is not available. The use of this high compression ratio contributes to the outstanding economy of the fuel consumption,, TRANSMISSION, The ...
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