 | Home > Maintenance & Modifications > Real World Engine Swap MPG |
 
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| Shroppy Member Since: 25 Feb 2016 Location: Shropshire Posts: 866   
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I apreciate that MPG may not be a deciding factor, but I'm curious as to what sort of MPG one could expect from the plethora of 'common' engine swaps.
So, what engine / transmission are you running, in what vehicle and what MPG are you getting?  1985 127 V8 Build Thread
Series 2 109" Series 1 80" |
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26th Apr 2023 9:22pm |
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| Shroppy Member Since: 25 Feb 2016 Location: Shropshire Posts: 866
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Agreed, even with the aerodynamics of a brick, I would hope that a better balance of power/economy could be achieved.
My 200tdi 110 CSW (with roof rack) would regularly return 32 MPG on Shell diesel or 30ish on supermarket diesel when driven sensibly. It was however, rather slow. I had intended to build my 127 with a Rover V8 as it originally left the factory (albeit a 4.6L variant), but the prospect of 15MPG for an engine that produces no more power than a modern 2L has led to me considering other options. 1985 127 V8 Build Thread Series 2 109" Series 1 80" |
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27th Apr 2023 6:55am |
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| pjm-84 Member Since: 12 Apr 2021 Location: Hampshire Posts: 661
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BMW straight 6 for me. Petrol or diesel. No idea what Ineos have managed to do with them but generally super efficient for the output
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27th Apr 2023 9:11am |
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| MarkBrown Member Since: 03 Oct 2022 Location: Mid Wales Posts: 459  
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The Mercedes OM606 automatic in my 110 does 20mpg overall, 27mpg on a long steady motorway run.
My Mercedes c220 CDI will get 42mpg overall, with 55mpg on a motorway run. However when we tow our box trailer behind it we only manage 25mpg, so not much better than the Land Rover. Years ago my 110 3.5 efi swapped ( manual lt77 ) 110 achieved an average of 18mpg, with a best of 23 on a run to Scotland. My 110 200 TDI achieved average of 22mpg, but I never took it on a run without a trailer, so not sure about the best it could achieve, probably high twenties. My old 110 2.25 petrol did a whopping 16mpg around France. Flat out, of course! |
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27th Apr 2023 10:33am |
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| Defendermatt Member Since: 15 Sep 2016 Location: Derbyshire Posts: 313 
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My Lexus 4.3 swapped 90 does 12mpg
 1989 90 4.3 V8
2012 L405 OF 2014 D4 HSE Lux (SOLD) 2015 90 HT (SOLD) @d9o.mf |
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27th Apr 2023 11:22am |
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| TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 1043  
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My wife's (new to us) 2010 Discovery 4 3.0 (diesel) did an easy run back and forth between Paris and Rennes (~500 miles) with a measured consumption of 37 mpg (7.6 l/100km). Pretty darn good I though
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27th Apr 2023 1:26pm |
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| sako243 Member Since: 08 Jul 2014 Location: Wales Posts: 1218 
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Is that driven how a normal person would or how a sensible person would?  Ed
82 Hotspur Sandringham 6x6 95 Defender 110 300Tdi |
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27th Apr 2023 2:08pm |
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| pj2106 Member Since: 20 Dec 2012 Location: Huntingdon AKA The Shire Posts: 1500 
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My N57 locally does circa 32-35 on a run upto 38 so pretty pleased with that 2008 110 2.4 XS Utility (Hagrid)
2002 90 TD5 Hardtop (Sully) Sold 1998 300TDi D1 (Billy) Sold |
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28th Apr 2023 6:25am |
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| Shroppy Member Since: 25 Feb 2016 Location: Shropshire Posts: 866
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What vehicle is that in? They are some impressive figures! 1985 127 V8 Build Thread
Series 2 109" Series 1 80" |
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28th Apr 2023 6:42am |
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| pj2106 Member Since: 20 Dec 2012 Location: Huntingdon AKA The Shire Posts: 1500
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2008 defender 110 2008 110 2.4 XS Utility (Hagrid)
2002 90 TD5 Hardtop (Sully) Sold 1998 300TDi D1 (Billy) Sold |
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28th Apr 2023 7:14pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8021 
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2.4 110 usw 28mpg avg over 98k miles, 12% towing avg 2.5t
2.8 tgv auto 90 truck cab 24mpg. Mainly off road. 2.5td5 100"defender chassis, off road only 1l.per km planning range. 200tdi disco in 90 28mpg over 6k miles 2.8tgv trayback, off road 1l per 2km planning range 2.4tdci 130 24mpg 9ver 15k miles, 30% towing, vehicle not far off gvw, 10% offroad 3.0 m57 in a 90, 25mpg over last 600 miles, including two days off roading over 17 miles Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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28th Apr 2023 9:11pm |
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| Mossberg Member Since: 29 Feb 2020 Location: Lancs Posts: 553 
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I have a 300tdi in my 90 its a disco engine as it has all the sensors etc. I had heard the 300tdi gives around 28 mpg, so whilst I hoped for something near that figure, with it being in a 1993 90, I accepted the fact it may have a bit of wear and may not quite reach that.
I recently did a run down to Chepstow from just north of Manchester. The total mileage when I refuelled was 184 miles with about 50 miles of those on the motorway and the rest on A roads through Shropshire and Hertfordshire down to Chepstow. I took it relatively easy, keeping to 55mph or there about where possible (with the enevitible slowing/accelerating on the A roads). I looked at where I filled it to and when refilling, I topped up to exactly the same point. I am happy to say I got 29.45 mpg, which to say it's a purely mechanical engin,I am quite pleased with. I know it's not as good as an engine with an ecu controlling it, but I can live with that for the sake of not having electrics to deal with. I suspect I may have a Disco transfer box fitted as I can quite easily achieve 70+ mph, but I need to check the serial number on the box to confirm. |
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29th Apr 2023 5:46am |
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| Baytown Member Since: 30 Jan 2016 Location: Cairns Australia Posts: 83  
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As above, my 2012 110 runs an LS3 6.2 V8 mated to a matching 6 Speed Auto.
I changed my 2.2 as I was towing at the time. Fuel economy has effectively halved if not less with running 98RON bs the 2.2 diesel. I used to get over 1000kms from my 127 litre rear tank, now get around 600kms. I’ve never done an actual Kilometers per litre calculation as it would be pretty poor. Unfortunately the current BMW conversion wasn’t available and the LS3 is a very common engine in Australia Re parts and service vs the BM which no country town would be happy fixing. On the Pro side of things, the motor pulls like a 14 year old school boy and it’s easy to inadvertently spin the front wheels at take off if heavy footed. The vehicle has been transformed re driving ease.  Click image to enlarge 2012 110 LS3 6.2 V8 - 6 Speed Auto |
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19th May 2023 12:23am |
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| boxoftricks Member Since: 06 Feb 2019 Location: Home Counties Posts: 747 
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Who cares about mpg if you can spin up the front wheels and drift around the corners
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19th May 2023 10:09am |
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