in need of some serious help newbie
Turbo Mini Forums

i have read through various topics and how to guides and ever since i have owned my mini i have had a funny feeling that its been build ready for a turbo but never got to actually having a turbo fitted i need someone to clear this up for me so i dont splash out on party when they may be under my nose.
are these parts anything that could help towards a turbo 1300

mg metro block not turbo but has thick dished pistons ???

richard longman big valve unleaded head not been told its turbo but from what i have read it seems better than what some have been using ??

maniflow system and manifold i dont know who buy mayby maniflow ??

but i belive the metro 1300 has to high compression 10.1 but were they standard with dished pistons or is that somone who was trying to get the cr down for a turbo build

from what i have read the dished pistons mg metro block big valve head all in very good condition are all useable am i dreaming of a cheap ride or is this true please help many thanks jordan

You need to accurately work out the compression ratio by measuring the piston to deck height, piston dish and head volume. bk450 head gasket is about 3.8cc.

For 10-12psi 9:1 compression ratio would be my target, you may be better off with a different head and get the chambers opened out to lower the compression ratio if that one has been skimmed a lot.

Edited by minimole23 on 29th Aug, 2012.

ok well does the metro 1300 come with dished pistons as standard i know some stuff on building but i wouldnt have a clue how to do all that could i not just do a compression test ??

Just get a flat piece of perspex, drill 2 small holes in it place over chamber/ piston dish (assuming the engine is split), fill with a fluid from a syringe or something you can quantify and hey presto, the amount of fluid missing when the liquid reaches the holes again is equal to the volume below.

There is a compression ratio calculator somewhere on here you can then punch the numbers in to work out the compression ratio, then you can work out how much needs to come out the head.

With mg metro pistons I'd imagine you need to take the head out to 28cc. to get the compression down.

Also mg metro pistons do look sturdy so if you can get the compression down they look like a safe bet.

thanks for helpfull quick reply learned somthing already i am away from home and cant work anything out with no numbers so i will find out . ino it has been ported and polished and when new they have 26-28 cc chambers so i imagine that wont need no head work but i will see thanks.

You need to measure the head. If its had work done, it's more than likely been skimmed to increase the CR.

In the 13's at last!.. Just

Yes its been skimmed but only because of blown head gasket caused surface damage I need to.know what to measure

You need to measure the chamber volume. Combined with the volume of the piston dish, ring lands, gasket etc, you can calculate your compression ratio and work out from there what you need to do to get to an ideal ration for FI. It may well be that you could get the head further modified to suit if need be.

have a search for calculating compression ratio - there should be a pretty detailed thread telling you how and what to do.