mg metro 1300 pistons. are they different to std 1275?
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Trying to work out roughly what my CR is on my Allegro engine. It says in the haynes manual that it should have been 8.8:1 but I have since put an Mg 1300 head and cam in it.

Would this have bought the compression up to the MG engine spec? As my cranking psi was 150psi and after the head and cam it is still 150psi. I would expect the cranking pressure to be higher due to the smaller cc in the head.

Any help great fully received

Any one?

Head CC is the same. The pistons are different.

In the 13's at last!.. Just

Seconded. All 12G940 heads are the same size no matter if they are from 1968 or 2000.

so in theory static CR should be the same as before?

what would the piston CC be for this engine and whats the cc for the MG pistons?

if any one could link me to a previous topic with the info that would be grand

Cc is the same. Compression height is different.

In the 13's at last!.. Just

If an old A-series, I think the pistons are around 11cc.
A+ ones are smaller.

Edited by Vegard on 24th Mar, 2014.

Was the MG engine A or A+?

A+

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