Metro Turbo Engine

[jase12377]

Hi guys an gals i have a metro turbo engine i need to know if it is high or low compression the engine number is 12HC16AA103015. CAN ANY ONE PLEASE HELP THANKS

[dogfather]

i ran a search for you and this is all i could find your number is the only 1 i cant see hope it helps
C.R.
\/
12HC17AA 8.0 : 1 1986 1.3 Saloon
12HC18AA
12HC19AA 9.75 : 1 1986 1.3 van
12HC09AA
12HC10AA 9.75 : 1 1986 1.3 Van
12HD26AA 9.4 ; 1 1987/1988 MG Metro turbo
12A2EK71
(mini) 10.0 : 1 Single point injection with manual transmission, 95RON unleaded only.
12HB09AA
12HB22AA
12HB36AA 9.75 : 1 1985/1986 1300HLE
12HA73
12HA84AA
12HA37AA 8.0 : 1 1985/1986 Low compression.
12A2BG05
(mini)
9.4 : 1
1990- onwards 1.3 Mini with carburettor
automatic transmission
12A2DF76
(mini)
10.1 : 1
1991- onwards Single point injection with manual transmission, 95RON unleaded
12A2AG01
(mini)
9.4 : 1
1991 1.3 Mini with carburettor manual transmission.
12HC11
12HC14
10.5 : 1
Oct.1984- onwards MG Metro
12HD09AA 12HD10AA 12HD11AA 12HD12AA 12HD13AA 12HD21AA 12HD22AA
9.75 : 1 1987 / 1988 1.3 Saloon
12HD18AA 12HD19AA 12HD20AA
8.0 : 1 1987 / 1988 1.3 Van
12HD14AA
12HD15AA 9.75 : 1 1987/ 1988 1.3 Van
12HD18AA 8.0 ; 1 1989 1.3 saloon
12HD26 9.4 : 1 1989 MG Metro turbo
12HD09
12HD10
12HD11
12HD12
12HD13
12HD21
12HD22 9.75 : 1 1989 1.3 Saloon
12HD23 9.75 : 1 1989 1.3 Saloon, Vandenplas,
MG Metro
12HD17
12HD24
12HD25 10.5 : 1 1989 1275 Sport, MG Metro
with manual transmission
12HD19
12HD20 8.0 : 1 1989 1.3 Van
12HD14
12HD15
12HD16 9.75 : 1 1989 1.3 van
12HD41
12HD42 8.0 : 1 1989 1.3 Saloon with manual transmission
12HE48 9.4 : 1 1989 1.3 saloon
12HE24
12HE25
12HE48
12HE71
12HE72
12HE73 9.4 : 1 1989 1.3 Saloon with manual transmission
12A2EK72
(mini) 9.4 : 1 1996- onwards Multi point injection, 95RON unleaded only.
12A2LK70
(mini) 10.0 : 1 1996- onwards Multi point injection, 95RON unleaded only.
12HA83AA
12HA42AA 10.5 : 1 1985/1986 High compression
MG Metro
12A2BG03
(mini) 9.4 : 1
1990- onwards 1.3 Mini with carburettor,
manual transmission
12A2DF75
(mini)
9.4 : 1
1991- onwards Single point injection, manual transmission, 95RON unleaded only.
12A2EF77
(mini) 10.1 : 1 1991- onwards Single point injection, high compression., 95RON unleaded.
12H996 10.5 : 1 >0ct. 1984 MG Metro
12HF01
12HF02 10.5 : 1 MG Metro

[jase12377]

Yeah i have come up with the same search i can not find my engine any where do you think it would belong to another car

[annodomini2]

All True MG Metro Turbo engines should be 9.4:1

[dogfather]

annodomini2 said:

All True MG Metro Turbo engines should be 9.4:1

im not to sure about that but i may be wrong reason being, my metro 1275 engine is a 12HE72 and as you can see on the chart above thats standard 1275 with a CR of 9.4.1, i would of though the turbo would have a greater CR

[Snake the Sniper]

dogfather said:

annodomini2 said:

All True MG Metro Turbo engines should be 9.4:1

im not to sure about that but i may be wrong reason being, my metro 1275 engine is a 12HE72 and as you can see on the chart above thats standard 1275 with a CR of 9.4.1, i would of though the turbo would have a greater CR

The 9.4:1 is the static compression ratio. It doesn't matter whether the engine is NA or not as it's determined by the the engine internals. In fact NA engines tend to have higher static CR. But that's another topic all together.

[dogfather]

Snake the Sniper said:

dogfather said:

annodomini2 said:

All True MG Metro Turbo engines should be 9.4:1

im not to sure about that but i may be wrong reason being, my metro 1275 engine is a 12HE72 and as you can see on the chart above thats standard 1275 with a CR of 9.4.1, i would of though the turbo would have a greater CR

The 9.4:1 is the static compression ratio. It doesn't matter whether the engine is NA or not as it's determined by the the engine internals. In fact NA engines tend to have higher static CR. But that's another topic all together.

i did say i may be wrong hehe, so am i wright in saying the bore size on the turbo could be, or is the same as the NA engine as stock.. I thought they would be bigger?

[Snake the Sniper]

The bore size is the same for all 1275's. The volume at the top of the stroke will however be bigger. IIRC this is done using dished pistons.

See this link for an explanation of the static CR.

Edited by Snake the Sniper on Sunday 18th May 23:42

[Mini_Lund]

12H indicates that the engine is a 1275, with a High compression Ratio. L would mean that the engine is a low compression.

This will help (paste into URL):

file:///C:/DOCUME~1/HP_ADM~1/LOCALS~1/Temp/A_Series_Engine_numbers-1.htm

Edited by Mini_Lund on Sunday 18th May 23:45

[dogfather]

thanks mate that a great help to understanding. cheers..neale..

[Fatboy]

Mini_Lund said:

12H indicates that the engine is a 1275, with a High compression Ratio. L would mean that the engine is a low compression.

This will help (paste into URL):

file:///C:/DOCUME~1/HP_ADM~1/LOCALS~1/Temp/A_Series_Engine_numbers-1.htm

That link is pointing to a file on your local machine, not somewhere web accessible?

[Cooperman]

Simple answer is to take the head off and measure the comp ratio, then you will know for certain.

[Mr POD]

Cooperman said:

Simple answer is to take the head off and measure the comp ratio, then you will know for certain.

Vizard will explain how !!!