high mpg engine
Turbo Mini Forums

hi i want to build a high mpg engine but dont know what engine to pic or what spec to use. i didnt really want to use a turbo although id love the power, i would like it to be fairly quick but main concern is mpg as i did 16k last yeah in my mini clubby estate. i currently have a 1275 mg engine fitted which i like it is fitted with the standard 3.44 diff i was think of maybe going for a 1098 and a 2.95 diff as the 1098 is quite torquey? i was also thinking of using the sw5 cam as this gives increased torque also. then a gain i was thinking of trying a small bore head on a 1275 engine to see what that produced. ive tried 998s with 1275 heads on but they just seem to drink more juice. im my experience they keep blowing head gaskets to. ive tried many head gaskets on them but no joy?
any help greatfully recieved
thankyou dave

why not fit a diesel metro engine and run it on veggie oil?

lol Doodles. Yep, make sure it has a bosch pump.....you can run 100% veggie oil!

Have a read of this thread:

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=10736

Very interesting stuff.

Hi,
Here's my plan for what it's worth:
Full Mpi 1275 bog standard.
Throw a T2 on the back, use a piggyback ecu for the on boost fuel and the full ignition map.
You can then have nice economical relaxed cruising, and 10psi of boost to play traffic light GP's with
Cheers,
Gavin :)

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you cant have the sweety and the pennys

if mpg is your goal a 1275 N/A engine with high compression and mapped ignition set correctley! is the goal

standard cam, head etc....

David vizard many years ago did well over 50mpg in the states in his mini on tour its all in his book

consider a jap diesel on vegie oil as your daily runaround

theres plenty of ASDAS & TESCOS in the uk

i used to get 40 mpg out of my highy tuned 1380 no problem.

running 11.5 cr and a 276 cam with a 2.95 diff.

always looking for them bigger bunches of bannanas

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

hi thankyou very much for all the replies very helpful. first of all i was wanting to stick with the a sereis because it will be quicker swapping engines rather than modding the front end. my parnter has a bog standard 998 city E it even has standard exhaust and manifolds! ive used that for work and got 51mpg out of it even on a long journey, travelling at 70-80mph it does about the same maybe 45mpg it just has no go 0-60 in about 3 wks.
if i drive my mg engine reasonably i can get 40-43mpg but if i drive it hard it only returns 30-35mpg. ive thought about both the k sereis and the metro diesel lump. again the modifications to the body and front end? ive spoken to people about the fuel return of the 1.4 16v engine which has 105bhp as standard. people has said the only get 35-40mpg out of them. i found that if you use the head off a maestro 1275 which i believe to be of stage 2 spec as standard. ive fitted it to many of my 998s and also my 1098 and found it lasted the longest with a copper 998 head gasket. ive found that fitting a standard 998 head to the 1098 went better than the 1275 head maybe because of CR differences? thats why was woundering about the 998 head on 1275 bloke. i thought about the 1098 because of its higher torque and added torque of the sw5 cam.i thought the added torque will pull the 2.95 diff better and maybe even get 100mph out of it?lol also in my experience ive found the higher the cc the more fuel used.
also i have lots of a series engines
thanks again for all you help

NOS is all fine and dandy if you can insure it!

HIC don't cover it for example.

Every day is a school day ...........

How fast and how expensive ...... the same question...

Wouldn't water injection help, as you can afford to run it slightly leaner?

I could be speaking b*llox, but just an idea?

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

water injection is a very good way to go ,not s much to run lean cos you still have to fire it and if you can run say 17 to 1 afr then firing it is not going to get any easier by stuffing some waater in there ..where it really pays off is to stick the compression ratio up to say 14 to 1 ,and then use the water to stop full throttle detonation and gain a v big gain in part throttle economy ... ,this will work well if and a big if , its set up well .
regards robert

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

im still collecting parts for my high mpg engine designed to be a summer daily, though alas not this year.

the plan:

1420cc (stroked crank and a 73.5mm bore)
998 Cam with 1.5:1 roller tip rockers
Mildly ported 940 head with MG valves, 10.25-10.5:1 comp ratio
economy (overdrive) drop gears from a late metro 1275 (non-mg)
Wide ratio (economy) gearbox from the same engine and metro 998 HLE
2.76:1 final drive, with the effective final drive of 2.53 (i think) with the over drive drop gears
Electric ignition and single HIF44 carb using the original airbox and hot air feed
Will eventually use EFI when the code is ready.

should return 50+ mpg and will hit 100mph at 4,000rpm. The wide ratio box makes it easy to drive and will pull away rapidly in 1st if needed.

I've seen the future and tbh its Pie

This afternoon, my NA 1275 just got 230 miles out of a full tank.

And there I was stood by the side of the road topping it up from the green can - the shame of it! (fuel gauge not working again).

It is a standardish MG Metro 1275 with a 33/29 head, 10.5:1 compression, an SW5 cam, factory type LCB, 2.76 diff and a single HIF44.

It used to get 43-45 mpg on a good run, but I've yet to get the Megasquirt timing right for good economy at 2500-3000 rpm (50-60mph).

It actually ran out of petrol because I was trying to get it down ready to put the SPi tank in tomorrow. I got just ten miles from home before it ran out.

It should have got further but I got carried away on the A1 - no details but we were zipping along!

And that is the problem - you can make it economical, but you still have to drive it slowly, and when everything else is going past you when you are doing 70 in the slow lane, you think shit, I can goes as fast as them and off you go!

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

hi i was just woundering if anyone knows any information about putting a metro diesel engine in a mini, i took on some of your advise and have decided to go with a diesel conversion as people say they will do 65+mpg and it has 57 bhp as standard. i was also woundering if anyone knows how to tune this diesel engine slightly, or if a turbo would fit easily to the block?

thanks again for all info greatfull
cheers
dave

my standard 1600 16v rover k-series would average between 40-50mpg with mixed city and motorway driving in a mini. thats 115 bhp, alot of fun for not alot of money! if your hell bent on a diesel, dont use a metro diesel unit, from what i remember these are the nat-asp horrible clunky shite pug/citroen TU based lumps?? get an engien that started out life as a turbo diesel, 1.7TD vauxhall nova/corsa as a donor!?

either way www.16vminiclub.com should answer most of your non mini engined mini questions :)

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

You would b right evo bout them being pug.

Back once again like a renegade master

i have a metro 115 that didnt cost me anything, ive been informed that they return 65+ mpg. People have told me they are quite revvy engine and fairly nippy for what they are? i was woundering if i could purchase a turbo off a different pug/cit engine that would fit? My first choice diesel was a 1.5turbo corsa engine as this would still be cheap tax and be quick.
thanx again for all the help

Hi,
If you put a turbo on it you'll need a boost sensitive injection pump too!
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

Any economy engine should be EFI for best results