Hey all, I've finally got to the root of my problem, piton rings blown and the piston is shot to shit. This has caused a very slight groove in the cylinder. Now, I'm taking it to a place on friday, having the cylinder re-bored, probably will only need about 0.0020" taking out, but this will require an over sized piston. If I only change the one, and make sure the new piston is exactly the same weight as a standard piston, can I get away without replacing all the other pistons? Surely the fractionally greater compression on that cynlinder wont make any difference, will it? Obviously all pots re-bored and a full set of over-sized pistons ain't cheap, so would like to get around doing that if possible!

 

Any advice would be greatly appreciated, cheers you lot! :-)

Hey all, I've finally got to the root of my problem, piton rings blown and the piston is shot to shit. This has caused a very slight groove in the cylinder. Now, I'm taking it to a place on friday, having the cylinder re-bored, probably will only need about 0.0020" taking out, but this will require an over sized piston. If I only change the one, and make sure the new piston is exactly the same weight as a standard piston, can I get away without replacing all the other pistons? Surely the fractionally greater compression on that cynlinder wont make any difference, will it? Obviously all pots re-bored and a full set of over-sized pistons ain't cheap, so would like to get around doing that if possible!

 

Any advice would be greatly appreciated, cheers you lot! :-)

 

i cant believe your even thinking about just doing 1 pot while you have the chance to freshen the motor up with at the very least a re-hone...imho its 6 or nothing mate;)

I know what ya mean mate, but all the others pots n pistons are immaculate, as is the rest of the engine, how the knob head who had it before me managed to blow the number 4 piston rings, I have no idea, I'm guessing he's carried on driving it, that's what has caused the damage...

I know what ya mean mate, but all the others pots n pistons are immaculate, as is the rest of the engine, how the knob head who had it before me managed to blow the number 4 piston rings, I have no idea, I'm guessing he's carried on driving it, that's what has caused the damage...

 

to much boost or to much rpm and once a ringland goes it will destroy the liner in about the same time as a single blink of the eye

Mate dont just do one bore thats silly your missing out a big opportunity to replenish your block while its out and im sure its not out that often. do them all and put in slightly over sized pistons like say 88mm

If you put just new rings on all the other pistons the compression would be nearly the same wouldn't it

i meant slightly over sized piston in all the cylinders not just one, should of typed pistonS :D

I have heard about this being done on before on other engines and to be honest it should be absolutely fine if all the pistons are the same weight. It does seem a waste of an opportunity to not hone all the barrels and fit new rings throughout though.

That's what I thought, I'll make the new piston identical in weight to a standard one... I know what you mean guys, but I just haven't got the funds at the moment, and I've had the car over a year now, and never driven it, due to working away alot of the time. But now I'm back at home, and can crack on with it. I've mastered liftin these engines, I can have one out and mostly stripped down in a day, so if If I've got money to spare in the near future, (which if all goes well I will have) I'll just whip it out again and do the lot. The inside of the cylinders are perfect, not even a trace of a lip from wear, it's only done 50k... Thanks peeps anyways....