MA10 to MA12 What do i need to know?

[joesouthgate]

Hi guys,
Sorry if this has been covered already but I just need a vague idea of what i'm doing.
Engine seized this morning, but luckily my m8 crashed his 1991 K10 1.2 a while ago so he sold it to the first years on our course for £50 and aparently they dont need engine and gearbox.

Basicly what i need to know is:

• What parts are different?
• What wiring needs to be done?
• What else other than engine and box will i need of donor car?

Thanks in advance
Joe

 

[Speedle]

pre facelift connectors will be different to the facelift ones (carb connections, gearbox reverse light) but these are easily changed, other than that its a straight swap

 

[whipit]

Doesn't fitting the ma10 carb to the 1.2 increase perfomance? I know fitting the ma10 head to the ma12 increases the compression ratio therefore performance (standard ma12 comp 9.0:1, ma10 9.5:1).

 

[ollyc98]

The 1 litre carb has a bigger jet, I have no idea why.

 

[whipit]

Yeah thought so,

 

[Speedle]

both pointless tbh the ma10 carb idea is sound but makes little or no difference as does changing the head were talking 1-2bhp gains which lets face it a good service can provide

 

[Mat.T]

every little helps!

 

[Speedle]

aye true Mat i should be more constructive

 

[whipit]

its not so much about the individual changes, just the end result. Since he has the ma10 parts anyway he will only be spending money on the gaskets.

 

[slyboogie]

is that true, about the head and carb change? How hard is it to do? might do it on mine =)

 

[frank]

slyboogie

if the piston crowns are the same on ma10/ma12, then the combustion chambers will be smaller on the ma10 which will give you a higher compression ratio

 

[K10]

but arent the ports are a different shape? apparently the MA12 are better for performance as they are more direct, wheres an MA10 head has shaped ports for effiecincy- or so i'm told anyway! I assume the shaped MA10 ones assist tumble or something

i've no idea on CR's, defo somrthing to consider

 

[frank]

dan

apparently the valves are the same size, so i assume the ports are the same also, i think the combustion chambers are smaller on an m10 so the raised compression will give you more power

 

[K10]

fair do's, i have no idea myself as i've never played with them, but I'm sure I recall a while back being told by experienced folk on here that they have different shaped ports also. could well be wrong! apologies for the bump steer.

 

[frank]

dan

that could well be true, bob,s your man to ask
i know that my ma12 went well with a 2 or 3mm head skim and a lightened flywheel but bog standard inlet and exhaust

 

[joesouthgate]

cheers for the replys