9 replies to this topic

[miniman207]

I have stripped me engine down completely as it was smoking like a chimney, im not sure which piston rings etc that i would need for the pistons tho.

I have a 1275 metro engine, pistons have 21963 STD stamped on them

Cheers

Gaz

[Sprocket]

Just a standard set of 1275 A+ rings. They are the three ring veriety. Fairly common and cheep too. Just be warned that if there is a lip at the top of the bore indicating wear, new rings may not be the only thing you'll need. You may get away with a light hone. This should always be done with new rings anyway to let them bed in. Also worth noting, depending on severity of the lip at the top, you may concider leaving the top ring as original and replacing the rest. This is because the original ring is worn to the shape of the bore at the top and if a new ring is fitted, it may hit the lip and break. If anything new rings on a worn bore will improve the situation some what, but for how long??

A lip at the top means a rebore rather than new rings. You are welcome to try it with new rings only but is by no means ideal, you may well end up back where you started with a smoker.

You have to asses the parts you have as to condition before deciding which way to go.

Hope this helps

[miniman207]

cheers or that sprocket, will getit sent off and rebored and honed, been quoted 30 quid each cylinder.

Just wondering what does the +20, +40 or +60 mean as i hav found some rings but dont know which 1 i need???

Cheers

Gaz

[Turbo Nick]

if you're having it rebored you'll need bigger pistons.

the +20, +40 etc is how many thou bigger than stock 1275 pistons they are. +20 will give you 1293cc.

[miniman207]

so if i get it bored out to a 1293 can i not use the pistons i got with the +20 rings then?

[Turbo Nick]

nope, you'll need to buy a set of +20 pistons, they usually come with a new set of rings though.

[miniman207]

just read about boring out to a 1380cc

Would i need to change anything else apart from pistons if i get this done?

Gaz

[Turbo Nick]

technically no....but personally if i were going to 1380 then i'd do a full engine rebuild. plus i'd stick to a 1293cc anyway so the block still has some rebores left in it.

[miniman207]

getting engine sent off tomorow to get it rebored to 73.5, 1380cc. i hav bought new pistond for the engine but was wondering if i would need a different type of gasket of will the 1275 gasket be ok?

Cheers

Gaz

[icklemini]

decent copper gasket will be fine. AF460 is the part number you need.

TTFN,
Dave