block
Turbo Mini Forums

hi all

before i jump in too early i have what is thought to be a metro turbo engine in my car i have the bulk head mod ready and im just going to buy the rest of the turbo and carb etc as its running normally aspirated what i would like to know is are there any noticeable things on the block to identify it as a turbo block also the head its runs ok so dont really want to strip it down needlessly the number stamp on it is 12H959AA which i have identified as a turbo engine just wanted to make sure incase someone has previous;ly put a turbo head on a standard block or visa versa many thnks in advance lee

And breathe...

Turbo blocks are no different from standard. You can check check the head by looking at the valve stems.

Have a read of the thread "turbo engine myths".

In the 13's at last!.. Just

Engine numbers are easy to swap but why would you. Also some turbo heads have a T stamped in them above No.4 cylinder. The dizzy should be numbered 42628 and may have a letter prefix or 41932 which may also have a letter prefix. But thats no guarantee that crank and pistons are turbo items as the turbo and MG metro cranks have bigger journals.

Edited by Mr Joshua on 9th Sep, 2010.

Own the day

Really, my worshop manual says different. I will check again

Own the day

Also, not all turbo heads had a T.

In the 13's at last!.. Just

Put it another way. Our metro van has turbo pistons on turbo rod's on a crank from a bog standard normal 1275 A+ fitted in a standard block.

Maybe this is another myth.

All A+ rods are the same though.

I'll put that another way then, the rod's are the ones that came out of the turbo engine with the pistons attached. Obviously I have no way of knowing if this was factory configuration or not.

I also have a striped MG Metro engine (removed from the car myself) and the crank is identical to a standard one I removed from a standard engine that I know the history of.

Mr J - Out of curiosity, which journals are bigger and which dimension is bigger (width or diameter)?

all turbo engines was A+
and all A+ are the same,

the turbo crank was hardened at the beginning of production and later phased out, all the A+ cranks are physically the same size

out of my mg metro engine,
the spi engine (my current turbo one)
and the completely original turbo engine my last unit was based on, every thing is the same ( bar the number on the crank)
so 1x mg 1275 + 1xlate cooper1275 + 1x original metro turbo 1275 = 3 identical bottom ends bar pistons

the only difference between all the engines ive stripped +rebuilt have been ( bar pistons head cams ect.) the nose bearing on the input shaft(1st motion) the turbo one is larger

Yes i moved to the darkside

Instagram @jdm_brett

[\quote=theoneeyedlizard,8th Sep, 2010]And breathe...

[/quote]

What are you on about? there is a semi colon in there somewhere, it's an odd usage, but it's there.

Myths about the Metro turbo engine still persist. As mentioned read this

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Mains journals, as for width or diameter Like i said I will check the big blue book but I am sure the MG and Turbo cranks had bigger mains journals. Also when i took a crank to be regroung for a turbo build the engineer said it wont fit as the mains were too small for a Turbo

Edited by Mr Joshua on 9th Sep, 2010.

Own the day

They didn't. All 1275 A-series engines have 2" mains.

Checked the big blue book and there are two different diamiters for the mains on an A+ crank 850 & 1000 versus all the 1275 models. My excuse is my poor memory due to age and self pleasuring

Own the day

On 9th Sep, 2010 Mr Joshua said:
My excuse is my poor memory due to age and self pleasuring

If something is worth doing, it's worth doing half of.

And you know this because you are blind?

Own the day

and I have a groove across my right palm

EDIT: spelling...

Edited by apbellamy on 9th Sep, 2010.

A Man grove? lol

On 9th Sep, 2010 apbellamy said:
and I have a grove across my right palm

It's medical term is a 'self-gratuitous crease'

Was there an A+ Marina?

I belive the very last ones were A+, then they stuck square headlights on it and called it the Ital lol

On 9th Sep, 2010 Sprocket said:

On 9th Sep, 2010 Brett said:


all turbo engines was A+
and all A+ are the same,

Not quite

The early A+1275 block had groove/ groove main bearings, up to around 1985 to 1987, no one can be sure. The turbo motor during that time had a plain/ groove main bearing, hence why people keep saying the turbo block is better. After this date, ALL 1275 A+ blocks had the plain/ groove main bearing. Rule of thumb way of telling which is an early or late A+ 1275 block is by the casting number WMF1024 clearly visable on the side of the late blocks, just under the head across number 3 and 4 cylinders, and the only way to tell a late 90's block is by the oil filter feed pipe fitting.

1992 onwards then saw a change in the screw fitting of the oil filter feed pipe.

Then there is the MPi block, the Marina block and the Maestro block. all A+ but different

Yes i moved to the darkside

Instagram @jdm_brett