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Old March 24th, 2010, 01:10 AM
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Kevin Jones
Ex-Mod 90 2.5na
Join Date: Aug 2008
Location: Eastern WA
Posts: 47
2.5 Diesel?

Are they the most dependable choice of lr diesel power plants?

Can they be converted to bio-diesel?

Are they worth the swap of low tech for low power?

Your input is much needed and appreciated....
"I can calculate the motion of heavenly bodies, but not the madness of people."

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Old March 24th, 2010, 02:40 AM
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John B.
1991 Defender 90, 200TDI
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Almost all LR diesels are 2.5 liter. Which one are you talking about? How much money do you have to spend? How much power do you want? What engine do you have currently?
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Old March 24th, 2010, 03:42 AM
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Paul Beckwith
92 D90 300tdi hard top rebuild
Join Date: Jan 2009
Location: Isle of Wight UK
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My guess is the Naturally Aspirated (NAd) non-turbo diesel - if so they are adequate - the UK military used them for years, so I guess they were quite a reliable unit to cope with squaddie abuse. Pretty slow on the road though probably about 50 mph cruising speed. They will all be pretty old by now though.............I reckon they should run on bio diesel OK with no mods - some folk over here run NAd, 200/300tdi on sunflower cooking oil, and the injector pumps dont seem to mind, bummer in cold weather though as it gets a bit thick.

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Old March 24th, 2010, 03:55 AM
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Jamie Austin
1992 110 Td5 CSW & 1989 MB G-Wagen
Join Date: Oct 2005
Location: Wiltshire, UK
Posts: 1,449
If you're going to swap in a diesel, i'd use a 300Tdi. very similar in layout to the 2.5 NA, and the block of the 300 is a descendant of the 2.5, so it has the bulletproofness of it.

The military use the 300Tdi in their current "wolf" XD rovers, and it's a very good engine. as much electrical stuff on it as the 2.5 (glowplugs,starter,alternator,fuel solenoid and water temp sender). Later 300's had EGR (Exhaust Gas Recycling) valves on the exhaust manifold, with an ECU to control it. this can all be junked and replaced with factory non EGR parts (it's only a blanking plate oyu need for the exhaust manifold anyway)

111bhp as opposed to 67 of the 2.5NA. can be tweeked easily (turbo boost and fuelling) to give around 130 RELIABLE horsepower.

the 300 can be mated to the LT77 gearbox that the 2.5 usually bolted to, so no major issues there, unless you fancied the newer R380.
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