Tuning a 948cc Engine

[eccles]

FWDRacer said:

eccles said:

It's been a while since I messed with Minis and A series engines, but from memory you can't fit a MG Metro head (big bore) to a small bore engine. You'll be restricted with the 12g295 cooper head or a 12g202.

You can - you need to pocket the block to accept AEG163 or 12G1805 or 12G940 1300 castings. Common practice in Mini Se7en race engines.

Decent inlet +1.5 SU, and LCB/exhaust and a warm cam will liven the Moggy up. See these fellas:-

http://www.aseriesspares.co.uk/

Edited by FWDRacer on Wednesday 1st July 14:05

I should have made myself clearer, I meant it won't bolt staight on.

[bencollins]

yep they is it is doable

[bencollins]

[bencollins]

Pocketing the block seems a bit extreme and the modest 3 bearing crankshaft not up to it probably.
Ill stick to to modest porting and new exhaust manifold and try to improve mid range where ill be 99% of the time.
Also try to find an longer legged diff axle with even a final drive of 4.222.

[bencollins]

ahhhh just seen the range of diffs really wide! so no need to change the final drive.

[Poisson96]

In the Moggy world, 1098 seems to be the way things go. Mine is a standard 1098 and can climb hills easily...

[AndyDRZ]

I have the same engine in an A35 (Still on Zenith so even slower than the moggy su carb version)

Simply taking the head off and doing a thorough decoke, reseating the valves and (to help reduce oil burn) fitting later valve stem seals made a massive difference to power.

All it cost was new gaskets and fancy seals from a mini spares website (slightly less good versions of the valve seals are pennies)

Yours is struggling going up hills at 30, mine was too. With just a days work learning and doing the above I think I must have gained about 30% more power and the sound is soooo much better.


Obviously a replacement large valve head would make even more difference but it's amazing how much free power you get reversing 50 years of neglect.