Engine re-bore

jonny12t · 03-02-2008, 06:38 PM

who would i go to for a re-bore and hopefully a set of new oversize pistons?

OCRDA · 03-02-2008, 07:02 PM

For what engine ??

Jon Fuller · 03-02-2008, 07:02 PM

I would guess at yam 90

Bad Boy 717 · 03-02-2008, 07:07 PM

shipping mine off to states, full rebuild, new Wizard pistons, injectors tested (bucato), Tony Doukas Reeds, new bearings, Straighten any egged bores if needed, new gaskets, honing, £1500! plus of course shipping! happy days

jonny12t · 03-02-2008, 07:25 PM

yep its for the yam 90, i bought a new block as the other one split the the a cylinder liner and the casting. but new blocks the bores are +0.25, +0.5 and +0.75 starting at the top. would that be such a problem though?

Jon Fuller · 03-02-2008, 07:47 PM

I reckon it'd be ok, but be sure to ballance the piston weights, as they're likely to vary innit.

jonny12t · 03-02-2008, 09:41 PM

arr a good point i didnt think of it like that.

Jon Fuller · 03-02-2008, 10:34 PM

I oversized just one lung on a Mercruiser HP465 a few years back (502ci V8 Chevy), ballanced it all up, and it was fine. I don't think these regular motors are fussy enough for it to matter about the differing swepped volume. Some will probably disagree.