2.5 na diesel in a 110- Advice? - Defender Source
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Old March 20th, 2012, 12:53 PM
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Tim Capelle
67 NADA Carawagon, 72 Series 111
Join Date: Mar 2010
Location: St paul MN
Posts: 23
2.5 na diesel in a 110- Advice?

Hello- I am a series 109 guy but have my eye on a defender 110.

It has the 2.5 na diesel low mileage. I read alot that the TDI is the only way to go but I want to try and run veg oil in the 2.5 n/a

I know the 2.5 na is slow/ a dog...
How bad/doggy are they - Any insights/advice from experience?

can you do 60-70 mph on the road? and when you hit a hill it slows to 55 mph....or 45mph??? type of thing....

Any other words of wisdom on the 2.5 na knowing I want to experiement with the veg oil aspects....?
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Old March 20th, 2012, 01:07 PM
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Former owner of a 84 D90 RHD 2.5 NA
Join Date: Jan 2012
Location: Phoenixville PA
Posts: 79
I have recently got a 90 with a 2.5na, and it's fine for around town driving but it slows down when hitting long hills. For example I have a 1 mile long and steep hill that has a 45 mile per hour speed limit, which is easily done in my navigator (in my old m3 I could do quick blast to 90, not that I ever did it). . With the 90 I'm down to 3rd gear and 35mph by the time I crest the top of the hill. That being said I love driving the trucks, it's fun, it's original and has a live real feel to it.

If the truck is a toy with a alternative car then you would be fine, if its a daily driver and you have a long commute maybe a different story.
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Old March 20th, 2012, 03:07 PM
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Jamie Austin
1992 110 Td5 CSW & 1989 MB G-Wagen
Join Date: Oct 2005
Location: Wiltshire, UK
Posts: 1,449
That old 2.5 is a reall slogger engine, goes on for ages.

gutless though, 65bhp on a good day. you won't break any speed records, but with a snorkel on it'll wade through anything!
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Old March 20th, 2012, 04:48 PM
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El Solis
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Chris Solis
Camel Trophy 110 sorta :)
Join Date: Jan 2011
Location: Livermore, CA USA
Posts: 537
I had a 2.5 turbo diesel in a 110 and it was really slow (had a 1.6 t case tho) but w the turbo I had a hard time hitting 55 on the flats.
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Old March 20th, 2012, 05:10 PM
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Matthew Greenspan
Land Rovers
Join Date: Nov 2008
Location: Nevada City
Posts: 1,719
I haven't owned a 2.5 diesel but have driven plenty. They can get up to 60-65 on the speedo in about the same time as a 2.25 petrol and 2.5 petrol. In the end those three engines are essentially the same and struggle when you hit hills. Realistically, 60 mph is plenty fast for travel so don't get the magic 70mph figure in your head that apparently is the standard benchmark for qualifying a 90/110/130 as "solid". It will feel much better and quicker than your 109 but pretty much the same though 70 mph is attainable it's not really maintainable as far as mpg drop off and noise levels.


Lots of good information on that forum.
Do not read the next sentence.

You little rebel, I like you.
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Old March 20th, 2012, 06:16 PM
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Mike Simpson
1955 86 1986 ExMOD 110
Join Date: Apr 2010
Location: Golden CO USA
Posts: 582
I swapped a 2.5na for a 200tdi in my 110.

The 2.5na was good for 60 to 65 mph on the level. On the other hand it wouldn't even hold a steady 30 mph on the west side approach to Vail pass.

I also have a 2.5na in my 86. It will go 70 on the level, but it is also painfully slow in the mountains. I can get up to 35 mph or so on the Eisenhower tunnel approach.

Acceleration isn't exactly zippy with the 2.5na but mine have been reliable. Just keep to the right and make sure your flashers work.
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Old March 20th, 2012, 08:11 PM
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John B.
1991 Defender 90, 200TDI
Site Team
Join Date: Sep 2003
Location: Calgary
Posts: 9,253
At sea level and in good condition they are not bad on the highway. 65 on the flats comfortably. They lose power with altitude, so are not a good choice for Colorado.

Also, "good condition" is the question. Take it out. If you cannot cruise at 65, it is bagged out. Despite what people say, they do NOT last forever. They are common as piss around here and I've seen a fair few die.
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