4 replies to this topic

[TheJakester]

Hi,

I'm in the middle of rebuilding my 1275cc MPI mini engine.

I'm looking for either new pistons or new piston rings.

The number on top of the piston is 21963 pm4 c09.

I went on mini spares and its says that the piston is for a 1300 metro engine.

This has me now really confused because I thought I had a 1275.

 

Please can someone spread some light on the situation?

 

Thanks Jake

 

 

[sledgehammer]

1275 is the 1300 engine

 

much like the 998 cc is the 1 litre

[ACDodd]

Yes that number is for all high compression metros and minis from around 1984. Your MPI mini does indeed use 21963 pistons as it is 1275 cc as standard.

Ac

[TheJakester]

​Ok thanks.

 

Do you know the difference between the 21253 and the 21963?

 

 

[ACDodd]

The 21253 usually comes up with a slightly higher deck height giving higher compression, easily fixed though if the crown is machined.

Ac