Is it salvageable??
Turbo Mini Forums

Hi,
I just stripped my 998 after it started burning excessive oil.
I built it last year, 12G940 head, pocketed block, MG cam
new bearings and rings

It went well and my intention is to turbo charge it.

I thought it would need a overbore and some new dished pistons,
however, i found the cause of the burning of oil, it has thrown one of the circlips off the gudgeon pin and subsequently the pin has scored a huge gash in the cylinder wall.

the gash is about 1-2mm deep, is this rectified by the largest overbore i can go with a 998?? is it +60??

Also thought i'd check the ring gap whilst it is bits, i have metric feeler gauges, so i got 1.1mm gap, is this big??

Cheers

998 turbo in progress.... DONE..........KNACKERED LOL

i've a 998 block in the same state, mine isnt salvageable even with a +80bore. I wouldnt like to use a block thats had this done anyway as essentially the cylinder walls have been bent/forced out of line, i cant imagine that this would ever be good for the block long term.

For future reference, there is a way to stop the circlips from coming out as it is a common occurance on 998 engines which rev in conjunction to using circlip type pistons. The solution is to buy/source/make some teflon buttons to fit inside the circlips, the details are available on this site if you do a searh.

1.1mm is a huge ring end gap, infact i think its double the upper tolerance. You should be looking at aroun 10 thou depending on exact application and rev-range.

I've seen the future and tbh its Pie

Right cheers mate

I think i'll use a 1275 engine for my turbo then, i really don't fancy spending 300 quid on pocketing another 998 and getting new bearings fitted etc.

I thought it was a big gap, but that was checking one ring on all cylinders

998 turbo in progress.... DONE..........KNACKERED LOL

Right cheers mate

I think i'll use a 1275 engine for my turbo then, i really don't fancy spending 300 quid on pocketing another 998 and getting new bearings fitted etc.

I thought it was a big gap, but that was checking one ring on all cylinders

998 turbo in progress.... DONE..........KNACKERED LOL

doublepost

Edited by andeh on 20th Dec, 2006.

I've seen the future and tbh its Pie

hi just read you post on whether the 998 block is usable. i dont know whether minispares still do them but they have liners which you can fit into the bore to bring it back as standard?

I have been offered a pocketed A series block, wants about 70 quid. I think its worth the money, forgotten how much i actually paid for pocketeing my A+ block. Anyone had it done lately??

998 turbo in progress.... DONE..........KNACKERED LOL

I was gonna sugest the liners, but once the liner is in you'd need to remove the bit where the pocket is anyway, probably not cort effective.

I think I remember Calver saying something about new extra oversize smallbore pistons that he's got from Graham Russell, may be worth a call.