Before you can answer "what is the best engine" you have to decide what you mean by "best".
While I would tend to agree with the more vocal respondents that the Isuzu 4BD1 is in many respects the best engine, it does have a few drawbacks, including its weight and a tendency to eat gearboxes and loosen the fillings in your teeth. But it is cheap to run, and parts are readily available in the unlikely case that you need them. And it will stand abuse better than any of the Landrover engines, and cost less to repair into the bargain after you have, for example, run it without coolant.
But if you want an engine that is almost as light and smooth as the V8, and produces as much or more power, consider a TD5 (with modified ecu chip) - but expect it to be expensive to buy and install and, while very reliable if looked after, repairs and parts will be expensive compared to the Isuzu. I think the installation will be simpler as well.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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