1275 mg metro to turbo
Turbo Mini Forums

I've just bought a mini fitted with a standard mg metro 1275.
From what I've read this will be a good starter to make a turbo engine.
Having taken the head of it will need a rebore and new valve guides
Was thinking of going to 73.5 bores but unsure about what valve material
Not looking for silly power but was thinking 5-6 psi boost and hoping the extra cc would make a nice drivable 120-130 up motor

Tony

Just take it up to the next usable bore size.

Taking a block straight to 73.5 is not really needed with a turbo motor.

You'll need about 12-13psi to get that power. Factory metro turbos had around 7 psi and made mid-high 90's.

What about the mg metro head, what mods are needed?

Tony

A fairly basic spec will see you over 120hp easily. As already said, don't bother going to 73.5mm, just go to 0.020" if that will clean the bores up. A mild cam, some head work, a decent intercooler and 10psi will see you over 120hp.
The stainless one piece valves are the ones to use, though for 10 psi the stock turbo ex and standard inlets will do. If you're porting it yourself following the Vizard book will give you a decent working head.

Phil.

WWW.TURBO-MINI.COM

Cheers Phill
What about the valve guides. Don't turbos have sodium filled?

Tony

Guide wise if your using the stainless race valves use manganise guides if they are STD valves use cast iron ones.