Perkins Diesels
Couldn't agree with Onslow more. Perkins engines will outlast UHT milk. My Dad had a big 4 in his sailboat, I had a 6-354 in my fishing boat. They are heavy, but tons of low end torque. You will need to evaluate you gearing carfully as they don't rev like your V8.
There's a guy in Fort Lauderdale who has lots of Perkins engines, Auto & Marine of Ft. L His name is Oliver Jones. He also has a bunch of Nissans and Isuzus but I just couldn't bring myself to use one, though I understand Isuzu conversions are pretty popular too, GM and Ford Diesels are too heavy for a Rangie, but properly resprung, I guess OK in a Def.
I looked into the Brazilian International 2.8, alot more torque and HP than a 300Tdi, but lack of spare parts suppliers scared me off. The nice thing about that engine is you can use your ZF gearbox AS-IS.
I ended up scratch building a 4.2 to replace my 3.9 in the Defender. HUGE improvemant, and rechipped, get 25% fuel improvement, though I wish I knew about the good deals on new 4.6 Bosch longblocks
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