big blue truck Posted July 7, 2009 Share Posted July 7, 2009 i have a 1984 2.5 Na diesel defender and wanted to know how i could go about getting more from my engine in terms of economy and, smoother engine and better top speed as i do over 200 miles a day in her. o and budget is tight and technical knowledge is limited. also is 60mph about right for top speed as thats all i get on motorways. not a problem but dont like my engine screaming it's Tits off. any help would be much appreciated. Quote Link to comment Share on other sites More sharing options...
bishbosh Posted July 7, 2009 Share Posted July 7, 2009 Simple answer - replace with a 200TDi. Sounds drastic, but it is not too taxing if you have a little help. Quote Link to comment Share on other sites More sharing options...
tychoS Posted July 7, 2009 Share Posted July 7, 2009 i have a 1984 2.5 Na diesel defender and wanted to know how i could go about getting more from my engine in terms of economy and, smoother engine and better top speed as i do over 200 miles a day in her. o and budget is tight and technical knowledge is limited.also is 60mph about right for top speed as thats all i get on motorways. not a problem but dont like my engine screaming it's Tits off. any help would be much appreciated. When I had a 2,5 n/a in a 90" CSW on 205/80R16 Michelin XZL it could go 110 km/h ~= 68 mph on flat tarmac, when properly warmed up. Change the diesel filter and the air filter. If it has a fuel sedimentor, clean or replace it. Serve the engine a bottle of injector cleaner and adjust it's tappets. Change the oil in the engine, gearboxes, differentials and swivels unless recently done. Don't forget the engine oil filter. Make sure the air pressure in the tires are correct. Check the wheel bearing adjustment. Close all windows and the air flaps (easily adds 5-10 km/h) These were all cheap do-it-yourself jobs. You could also have the injectors and pump checked by a diesel specialist. But that will likely cost the same as the replacement value of that particular model of engine. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted July 7, 2009 Share Posted July 7, 2009 What Tychos said, followed either by what Bish said, or putting a V8 in it Quote Link to comment Share on other sites More sharing options...
martinspragg Posted July 8, 2009 Share Posted July 8, 2009 I have the same set up and the same problem but I have come to accept that whilst I am not the fastest vehicle on the road I can overtake tractors, vehicles that are being towed, the odd HGV hauling citrus....and cyclists. Although I would like to cut the "peakyness" of the 2.5NA I have to plan most of these overtakes a few turns in advance (except cyclists!) to be in the right rev range and gear at the appropriate time, so it does help to know the road. I would hate a long motorway run in her but we don't have any here . Quote Link to comment Share on other sites More sharing options...
BogMonster Posted July 8, 2009 Share Posted July 8, 2009 Can't help but state the obvious - if you're regularly doing 200 miles a day a Defender is probably the wrong vehicle to be doing it in... Quote Link to comment Share on other sites More sharing options...
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