i have a standard 1275 engine what do i need to do too the engine to make it run a a turbo with a t2 conversion?do i need different head? pistons? cam? carb? i gunna buy a mirage manifold set too. what else do i need please help and does anybody know of any websites with a guide to carrying out the conversion?
Standard 1275 Engiine
Started by
bentedder
, Nov 10 2007 09:30 PM
2 replies to this topic
#2
Bristolmini
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Mini Mad
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Posted 11 November 2007 - 01:29 AM
There is a reasonable amount to do but it's not impossible. I was looking into this option when I had a carb engine. Unfortunatley I do not have any forst hand experience of building turbo engines but have done quite a bit of reading up on it and although it takes time it is worth the effort. What I have learned is as follows:
You have to replace the carb, a standard one does not work with a turbo. It's also recommended to replace the inlet manifold with a metro turbo one.
The cam should be OK if it's a standard engine, you don't want anything silly in a turbo a series, some people use the MG cam but no more than that.
The biggest problem is the need to lower the compression ratio, ho much you need to do this depends on the boost you will be getting from the turbo. Mild boost will need cylinder head mods to open the chambers a little, going further you are looking at replacing pistons.
It may be worth fitting an intercooler if you are planning on running a turbo, it allows you to run a little higher boost without problems.
As well as the engine side you need to consider getting enough fuel to the engine, you will need an electronic fuel pump, a lot of people use the SPI or MPI mini tanks with built in pumps, either that or a standard tank with an MG metro turbo fuel pump. You will also need to put in a fuel pressure regualtor before the carb and a fuel return line to the petrol tank.
you need an oil supply to the turbo which is quite straightforward but you need to be sure your oil pump is in good condition. If you are going for the mirage t2 setup then you may also need to plumb in a water supply to the turbo, the later type Renault 5 turbo was water cooled.
You might also want to consider fitting a bleed valve so you can set the amount of boost provided by the turbo and a dump valve, although the benefits of this are only realy seen on a high performance motor.
Next is to consider the cooling, you need to make sure your radiator is up to the job and you have a good fan and possibly also an electric fan. It may also be worth considering fitting an oil cooler as the oil is going through the turbo as well as the engine so will get hotter quicker.
The final thing engine wise is to make sure your gearbox is up to it, possibly the weak link in any performace mini engine. Most people fit straight cut drop gears and uprate the dif to a cross pin one at least. The minimum you should consider for reliability is a rebuilt gearbox.
Other things to consider are your brakes and susension set up, you want at least decent disk brakes and a well serviced standard suspension set up to be able to use the extra power confidently. Upgrading is well worth the effort.
Hopefully this helps a little but if any more knowledgeable people post I would listen to any advice they have.
You have to replace the carb, a standard one does not work with a turbo. It's also recommended to replace the inlet manifold with a metro turbo one.
The cam should be OK if it's a standard engine, you don't want anything silly in a turbo a series, some people use the MG cam but no more than that.
The biggest problem is the need to lower the compression ratio, ho much you need to do this depends on the boost you will be getting from the turbo. Mild boost will need cylinder head mods to open the chambers a little, going further you are looking at replacing pistons.
It may be worth fitting an intercooler if you are planning on running a turbo, it allows you to run a little higher boost without problems.
As well as the engine side you need to consider getting enough fuel to the engine, you will need an electronic fuel pump, a lot of people use the SPI or MPI mini tanks with built in pumps, either that or a standard tank with an MG metro turbo fuel pump. You will also need to put in a fuel pressure regualtor before the carb and a fuel return line to the petrol tank.
you need an oil supply to the turbo which is quite straightforward but you need to be sure your oil pump is in good condition. If you are going for the mirage t2 setup then you may also need to plumb in a water supply to the turbo, the later type Renault 5 turbo was water cooled.
You might also want to consider fitting a bleed valve so you can set the amount of boost provided by the turbo and a dump valve, although the benefits of this are only realy seen on a high performance motor.
Next is to consider the cooling, you need to make sure your radiator is up to the job and you have a good fan and possibly also an electric fan. It may also be worth considering fitting an oil cooler as the oil is going through the turbo as well as the engine so will get hotter quicker.
The final thing engine wise is to make sure your gearbox is up to it, possibly the weak link in any performace mini engine. Most people fit straight cut drop gears and uprate the dif to a cross pin one at least. The minimum you should consider for reliability is a rebuilt gearbox.
Other things to consider are your brakes and susension set up, you want at least decent disk brakes and a well serviced standard suspension set up to be able to use the extra power confidently. Upgrading is well worth the effort.
Hopefully this helps a little but if any more knowledgeable people post I would listen to any advice they have.
#3
Sam Walters
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Up Into Fourth
Posted 11 November 2007 - 11:39 AM
echo what Bristolmini says really
the carb needs to be sealed
it would be silly not to run a intercooler as its effectivly free power
you will have to put a box in the bulkhead for more clearence if your useing a metro turbo setup, however mirage manifolds can be used if you dont want to cut the bulkhead
a mg metro cam and mg metro head will be fine upto about 12psi of boost, you will either need a bleed valve or a diffrent actulator in order to raise the boost from 7psi to 12psi. beyond 12psi upto about 15 you need a head modification from there in you need head modifications and a change in pistons probably a block bore in order to get a big enough dish in the pistons. omega pistons are okay upto a full 220bhp as this has been proven in matt williams car people will say you need accrilite pistons at this level. your gearbox will need stright cut drops at this point and at least a 4 pin diff. also at this power level the bottem end will need strenthening a central oil pick (Essential no matter what power level imo)
160bhp is easlily achivible, its even been done on a standard head
turbominis.co.uk is a good site for finding information on this.
imho i think its more cost efficient to cut your bulkhead and use a metro turbo setup as opposed the mirage manifolds, as you could spend the money more effeciently in the engine
the mirage manifold runs a r5 gtt turbo however on the metro manifolds you can get a adapter plate to fit a t2.5.
the carb needs to be sealed
it would be silly not to run a intercooler as its effectivly free power
you will have to put a box in the bulkhead for more clearence if your useing a metro turbo setup, however mirage manifolds can be used if you dont want to cut the bulkhead
a mg metro cam and mg metro head will be fine upto about 12psi of boost, you will either need a bleed valve or a diffrent actulator in order to raise the boost from 7psi to 12psi. beyond 12psi upto about 15 you need a head modification from there in you need head modifications and a change in pistons probably a block bore in order to get a big enough dish in the pistons. omega pistons are okay upto a full 220bhp as this has been proven in matt williams car people will say you need accrilite pistons at this level. your gearbox will need stright cut drops at this point and at least a 4 pin diff. also at this power level the bottem end will need strenthening a central oil pick (Essential no matter what power level imo)
160bhp is easlily achivible, its even been done on a standard head
turbominis.co.uk is a good site for finding information on this.
imho i think its more cost efficient to cut your bulkhead and use a metro turbo setup as opposed the mirage manifolds, as you could spend the money more effeciently in the engine
the mirage manifold runs a r5 gtt turbo however on the metro manifolds you can get a adapter plate to fit a t2.5.
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