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metro turbo setups on standard mg motor..?
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Author:  meeni [ Mon Nov 05, 2007 9:06 pm ]
Post subject:  metro turbo setups on standard mg motor..?
hi guys

need a little bit more a-b power in the race car and turbos look like fun.. i dont want a mega power boost just a little bit more then what i have at the moment, can i buy an mg metro turbo set up and run that on my motor with a few minor mods ie, decompression plate centre main strap cam, timing gear.. etc.. (ive got a stage three head from the uk on it.. it has large valves double springs a big of metal off of it etc btw) if so.. how much power would it give me..? i know it sounds like the usual questions from someone who isnt really going to do this but i accually am going to so dont worry.. are these turbo setups safe on gearboxes and reliable.. as the car is a fun thing (944 next year is the serious thing) and i dont want to be spending silly $$$ just to keep it going..

any help would be great

cheers

sean
Author:  Harley [ Mon Nov 05, 2007 10:12 pm ]
Post subject: 
Honestly I have to say if you do simply want to keep it going the best way to do so is to leave it as it is. In any case I'd say the metro factory (claimed) 90 hp is easily possible, whilst staying within some boundaries of 'reliability'.
:D
Author:  slinkey inc [ Tue Nov 06, 2007 2:11 pm ]
Post subject: 
Sounds like a fun idea.

Yes you can turbo the normal Metro motor, jsut watch your timing and compression. Also make sure you cam shaft is suited to job.

The Metro Turbo motor isn't really anything majorly special IMO. Stock compression was 9.3:1, which is fairly high for a boost motor. They have fancy pistons, fancy bearings (or so I've read) and fancy exhaust valves - i think, also a stock Metro cam

Good motor, but nothing you can't do to a normal 1275.

Goodluck with whatever you do, do your research first, find out what you want to do, what you can do and put that up against how much you can afford to spend.

Have fun. :)
Author:  Spaceboy [ Tue Nov 06, 2007 2:16 pm ]
Post subject: 
i'd probably stick to the N/A after building a boosted mini, so much more to do and to go wrong with the turbo setup.

that and the average gearbox wont be up to it.
Author:  Mick [ Tue Nov 06, 2007 2:25 pm ]
Post subject: 
Wasn't there something tricky about the exhaust valves as well?? Sodium filled?

I had a Turbo engine, the crank bearings were quite distinctive in having no bearing groove in them.
Author:  Spaceboy [ Tue Nov 06, 2007 2:35 pm ]
Post subject: 
yeah i have turbo bearings in mine.
Author:  slinkey inc [ Tue Nov 06, 2007 2:52 pm ]
Post subject: 
Mick wrote:
Wasn't there something tricky about the exhaust valves as well?? Sodium filled?

I had a Turbo engine, the crank bearings were quite distinctive in having no bearing groove in them.


That's what I thought, but I just said 'fancy exhaust valves' as I wasn't 100% sure.

As for turbo bearing, I have NO experience with these, but for those interested have a read here.

http://www.hotbricks.org.au/techtips/articles/turbo_bearing.html
Author:  drmini in aust [ Tue Nov 06, 2007 4:21 pm ]
Post subject: 
The sodium filled exhaust valves were more trouble than they are worth. I hear many UK turbo dudes use stock 21/4N race valves now.
Author:  KLAS [ Tue Nov 06, 2007 6:22 pm ]
Post subject: 
yes, the sodium filled exhaust valves are no longer needed as long as you don't use maximum boost, and they are expensive, having a 8mm shaft you need special parts like top caps, guides, etc. i'm running normal unleaded ones without any problems and a bit more boost than factory
the non-grooved turbo bearings later become standard in all A+ engines
the 1st motion shaft nose bearing is bigger than N/A thats the only difference within the gearbox
camshaft was 60HP Metro
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