1275 Mongrel Build Advice
Posted 26 March 2020 - 07:50 PM
I've most likely gone about this the wrong way but instead of buying a complete engine I seem to have accumulated a pile of engine parts to build up a 1275. I do like making things difficult for myself.
My mini currently has its pre A plus 998 fitted. When I remove it I'll split it and use the gearbox and ancillaries for the new build.
I have accumulated the following:
1275 GT 11 stud block (getting bored +040)
12G940 head (getting 36/31 valves etc)
New old stock CAM6232 crank
Getting a minispares EVO001 cam.
I'm looking for around 10.5:1 compression ratio.
Any recommendations or advice on pistons, bearings etc would be greatly appreciated as I'm not 100% sure which parts are interchangeable between pre A plus and pre A plus.
I'm trying to keep costs down obviously but trying to build the best all round engine I can. 90+ bhp would be fantastic.
I've already fitted the minispares 7.5 inch disc brake conversion and uprated the suspension with genuine hi lo's and gas adjust dampers. (New standard cones going in soon). So the car just needs more power now.
Cheers in advance
Posted 26 March 2020 - 10:24 PM
That all sounds OK.
For pistons the P21253 - 40 will be fine. They have an 8.3 cc dish, so base your CR calculations on that. Gasket volume is usually regarded as 4 cc.
Evo001 cam is great. It's not bhp you need it is good mid-range torque and for that the Evo001 is ideal.
Make sure you do a 'dummy build' before assembling finally. Have the block decked to bring the piston tops to deck level at TDC.
One of the most important things is to gas-flow the head. That is the key to better performance with the A-Series engine. There is no point in having a great cam and bigger valves if the head is still restricting gas flow.
Posted 26 March 2020 - 11:01 PM
Posted 27 March 2020 - 12:15 AM
Posted 27 March 2020 - 12:29 AM
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