building a turbo mini 1275?

[armo]

rite lads whats involved in building a turbo engine i will be getting a 1275 engine this week is there much involved and what parts do i need to get thanks

[woody]

Main differances in turbo engine are pistons, cam, sodium valves and distributor.
If you don't want to modify bulkhead you can get mirage manifolds with a T2 turbo.
For high pressure fuel pump its easist to fit an MPi tank and fuel return line.
Instead of dizzy you can fit Megajolt.

[Kenneth Murphy]

check turbo-mini.com or turbominis.co.uk, great places to learn about turboing the a series

[J666ERA]

Crank is also different (stronger)
Head is different has larger water jacket (for cooling)
gearbox casing gears and diff are different and the bearings for the drop gear is bigger too.
Radiator, need high capacity and also better to have modified to allow an auxiliary radiator as well.
Oil cooler
Mpi tank is easiest way but fit bigger fuel feed and a return line the same size
Carb is totally different is a sealed unit capable of being pressurised
Need the fuel pressure regulator

[Kenneth Murphy]

crank is a myth, in some of the metro turbo's they ran non hardened cranks from the factory, i no as i got a hardened one, then the turbo guys informed me my standard crank would have done, have you ever heard of a mini crank snap???
standard helicoil gearbox and dropgears are well capable of 130 brake some have ran them to 150, i'm running standard in mine that will have 120-130, you will need a x-pin diff

[DAVEY_C]

where the head is concearned it has apeared a common practice to some to add extra water jackets around piston 4 and restricting the ones around piston 1 a bit to aid the cooling around piston 4 on a nonturbo head, the carb can be a rebuilt n/a hif44 using a turbo rebuild kit, standard gearbox can be retained but rebuilt, different finaldrive ratio, mpi tank will be a bonus but not essential because the return could possibly be disregarded but not ideal, the mechanical fuel pump does not suply a reliably constant flow so you may upgrade it, oil cooler not essential, just get a larger rad.
the most important thing realy is getting the c/r correct and i would advise against using a decompression plate. fit stronger parts and a centre main strap is essential, centre oilfeed pickup will be essential and may fit a baffle tray to save the engine...
the list is endless but as kenneth said and they are excellent sites too

http://www.turbo-mini.com/67709.html
that site has a wealth of info and can answer you questions.... phill also is the founder of the mirage manifold and rebuild lots of n/a to turbo.

[GTM Coupe]

crank is a myth, in some of the metro turbo's they ran non hardened cranks from the factory, i no as i got a hardened one, then the turbo guys informed me my standard crank would have done, have you ever heard of a mini crank snap???
standard helicoil gearbox and dropgears are well capable of 130 brake some have ran them to 150, i'm running standard in mine that will have 120-130, you will need a x-pin diff

Mini cranks do snap, I've seen dozens, even one myself, I've even seen billet ones go, so if I was building a turbo mini I would be using the stongest parts available. You have to remember that the best factory minis only had around 75bhp, so if you expect more HP then things have to be stronger. Centre strap absolutley, maybe even a 4 bolt main

[DAVEY_C]

someone with a similar build....http://www.theminiforum.co.uk/forums/in ... 180082&hl=

[woody]

A turbo build like any N/A engine build is open to any number of mods and any number of supplier of parts of various degrees of strenght. What you need to decide armo is how much power you want and how much your willing to pay for it. We would all like all steel engins puttin out 300bhp but we all draw the line somewere.

[kona]

Id be looking at a En40 crank. It all depends on the amount of boost you plan to run etc, AFAIK the metro turbo ran a particularly low boost.
Id upgrade the breaks too. In fairness a well sorted offset bored 1380 would produce similar power and be more reliable. IMO of course.

[DAVEY_C]

a 1380 would not produce the same torque and power for aprox the same effort but turbo will cost a hell of alot more.... no comparison imo.
a gt17 is the ultimate turbo and on a stroked 1340 i have seen 320 bhp but thats on a race engine.... achievable though

[Merlin]

Whos Engine is that Davey I only know of one 300 hp A series engine and it only pulls that with a 150hp jet of N20 ???

[Kenneth Murphy]

matts mini williams??? i LOVE that car

[DAVEY_C]

it was maybe 2 years ago i seen it on the drag strip in the uk.... some machine to go but couldn't see the engine lasting any more than a couple of runs.... phill in the uk runs a 998 with 155hp using a gt17.... that would be 305 with 150 of nitrous???

[DAVEY_C]

if you supercharge you mini you won't need half as much mods and can be bolted on with the engine fitted.... a good alternative.

[woody]

What manifold is that and which supercharger does it take?

[hughesmarkie]

[quote="DAVEY_C"].... phill in the uk runs a 998 with 155hp using a gt17.... that would be 305 with 150 of nitrous???[/quote]


Is the 998 not Wil H and Bens Red Clubman?

I agree with Paul only ever heard of 1 300bhp+ a series and its matts miniwilliams and he runs a lot of laughing gas, although there is rumours he did get up to 240bhp with no gas

Mark

[DAVEY_C]

What manifold is that and which supercharger does it take?

its for the bini m45 supercharger onto an a-series, a good alternative.

yep mark you right, that is wil's mini.... what spec and turbo is matt running?

[kona]

A 7 port 1380 would give you 150bhp and the engine wouldnt be nearly as stressed as 200bhp turbo. There is only so much power you can use in a mini IMO. It gets a bit silly upwards of 150bhp.

[armo]

i tink im gonna go with the super charger im not looking for crazy bhp i just like a little boost i was looking at the m45 charger there easy got and cheap

[J666ERA]

A Turbo HIF is not the same as a NA one, the turbo one has extra drillings these can be replicated outside the carb, the Turbo HIF also has a clamp on the top to stop the oil plunger undoing under boost.

Extra cooling of number 4 pot essential.

Some Turbo's didnt have the harder crank just down to production runs and availablity.

For reliable (RELIABLE) running auxiliary water cooling and an extra inner wing fan and an oil cooler recommended. You can run without but any length of time at full pelt it will be getting hot.

Turbo also has a high capacity oil pump.

Key to turbos is getting rid of heat and applying the boost in a controlled manner, lots of people dont bother with the boost modulator, thinking they get more power without it, yes seems so they get more power low down and loads more torque but the boost modulator is there to try and avoid blowing the centre of the gearbox out under shock torque loading. ERA even calmed the Rover one down more.

Yes I have seen a snapped A series crank and one with the tail sheared off and one with the nose snapped off and a block cracked in half down the middle and a drive shaft rung off inside a CV joint. They will do all this.

Anything over 120 and you are into the territory of unreliability or needing to work on the box.

As Woody says Speed Costs money, how fast do you want to spend...

Paul

[ian o B]

i tink im gonna go with the super charger im not looking for crazy bhp i just like a little boost i was looking at the m45 charger there easy got and cheap

anyone know of or have a supercharged mini in the club????

[Kenneth Murphy]

only in the uk, afaik

[mustard]

i tink im gonna go with the super charger im not looking for crazy bhp i just like a little boost i was looking at the m45 charger there easy got and cheap

anyone know of or have a supercharged mini in the club????

there was one for sale on donedeal about a year ago...afaik