
Originally Posted by
Bush65
My old 4 banger diesel can produce plenty of useable torque/power, along with good economy and reliability. I don't need or desire more. In most states the speed limit is 110 kmh, or 130 kmh on some NT roads, and mine will reach those speed in not many seconds, and will easily exceed them by a large degree. So what price for maybe a few seconds gain?
On a test drive of your imaginary Defender, I might be impressed by the performance, but not of it's practicability. I want to travel long distances in the outback, far from a servo.
As stated I have regularly expressed my opinion on a suitable engine type, when others have suggested the Puma is mana, or like you, the V6 or V8 diesel from a Disco or Rangie. Many have misconstrued my comments as being anti-technology, but in fact I am simply anti small displacement, inefficiency and complexity.
The issue with small displacement is low torque until the turbo produces enough boost. IMHO, between 3 and 3.5 litres, from a modern diesel is plenty. Ford and Mazda have used a larger displacement version of the puma engine Land Rover chose. Land Rover had good reasons for the small engine in Britain, but IMHO their sales would be greater in Australia if they offered a larger displacement engine option.
V6 and V8 engines are not ideal; too complex, too expensive, too many moving parts, too many expensive parts that will need replacing over time, too much space in the engine bay.
An inline engine will always have a stiffer block, and better supported crankshaft, and in a high compression diesel the lower region of the cylinders are not subjected to high loads from adjacent cylinders. 'V' engines don't lend themselves to turbocharging as naturally as an inline engine.
Although an inline 6 cylinder diesel would be smoother and can take good advantage of pulse turbocharging, they are not as efficient as an inline 4 (more friction from extra moving parts) and cost more to manufacture (more parts). I can put up with the reduced smoothness of an inline 4, particularly given all of the advantages. In some states, registration fees increase with number of cylinders.
Summing up, I would like to see Land Rover use an inline 4 cylinder diesel of between 3 and 3.5 litres. An inline 6 of the same displacement would also be a good choice.
I understood JLR and Tarta were working toward a new engine design of their own, and what I have said is well understood, so there is hope.
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