3 replies to this topic

[Southy]

Right im in the process of stripping down my newly bought 1275 engine and ive took off the head and cleaned up the top of the pistons and checked the bores.....

From the looks of things the block has recently been honed as you can still see the machined lines so its got me thinking...has the block been rebored?

The pistons that are currently in are numbers 21962 G8 S04, how do you tell from this if its been rebored?

There is also stamped in the middle of the pistons a small 2 with a B underneath whats this mean?

Ive found out the 21962 are for a compression ratio of 8.1

I was thinking the compression ratio is a little low and ive got a spare set of pistons lay around with new rings fitted the number on these is 20832 L25 with STD (meaning standard i presume?) stamped on but i cant seem to find any information anywhere about these

Any advice/info regarding these pistons will be most helpful

[Southy]

Just to add the set of pistons i have hanging about have printed on the inside Hepolite 413 p dunno if this will help with it

Anyone have any suggestions as im really stuck?

Edited by Southy, 28 March 2008 - 08:07 PM.

[minipac]

Just to add the set of pistons i have hanging about have printed on the inside Hepolite 413 p dunno if this will help with it

Anyone have any suggestions as im really stuck?

hi mate if this link dont work do a search on google for (mini piston 21962) it might help they are talking about piston with the same code

http://www.theminifo...showtopic=67557

[Southy]

Cheers for that minipac i came across that earlier but doesnt really answer what i need as i dunno how you tell if its been rebored and not got my digital calipers to hand.

Ive tried my other set of pistons in the top of the bore and it seems a fairl snug fit with a slight bit of sideways movement....but i know this isnt a true measure