5 replies to this topic

[we5ty]

hello all! 

 

I am undertaking the project of my 1991 rover mini city. unfortunately shes a little rusty, so the body and engine are having an overhaul! 

 

i have bought a 1275 A+ engine as its currently running a 998. this is getting my first dose of attention while i sort out the rest of the workshop ready for welding the body

 

SO HERE IS MY FIRST QUESTION!... ( drum roll)... 

 

i plan to use twin HS2 carbs and a fast road camshaft, however, since im getting the block re-bored to its next size ( piece of mind rather than performance) do i use high compression pistons or standard compression? the plan is to oversize the valves and port and polish the head also... but advice is needed on what pistons to use?

 

 

i look forward to your replies! 

 

Westy 

Attached Files

•  mini.jpg   73.38K   1 downloads
•  mini2.jpg   53.65K   3 downloads

[carbon]

Are you talking about work on the 1275? If the block is not worn then personally I would reuse as it is.

 

Check what pistons you currently have fitted, head can be skimmed to raise CR if needed.

 

What cam are you planning to use?

[Stiggytoo]

You need to build the engine to the compression ratio you wish to achieve. 

[we5ty]

yes work on the 1275 A+ :)

 

there is some minor scratching on the cylinder walls so im just going for a rebore. 

 

at the moment it has dished pistons it in, the bloke i bought it off claimed the block was standard with no modifications yet 

 

as for the cam im planning to use one from mini sport, i know its not a kent cam or anything too fancy but i know they are to a good standard and work well 

 

the specs are: Application:    Fast Road

Power Band:    2000-6500 rpm
Valve Lift:    0.318 "
Duration:    252° 
Timing:     16/56  51/21 
Valve Clearances:    Inlet - 0.015 "     Exhaust - 0.015 "
Lift (TDC):    110°

[Stiggytoo]

252° 'fast' road?

[KernowCooper]

I would at least use a kent 266 the modern version of the MG Metro cam, then you will have a nice road engine if the Heads done right, the secret to any power in a A Series always comes back to a good with good CFM, put what cam you like in its the head which allows the air flow into the combustion chambers