G'Day from Australia chaps (and chappettes, let's not assume!). It's a while since I posted in this forum but I've been a bit busy.
Recently I've been going through my stock of bits and pieces preparatory to doing some engine reconditioning and have a bit of a puzzler.
I have an apparently brand new pair of barrels with pistons and gudgeons. No worries, thinks I to meself, I'll just order a set of rings for these pistons and all will be both Hunky and Dory to use them.
Careful measurement reveals that the ring grooves are 2mm, 2mm and 3,5mm. The only set of rings close to this seems to be 1.75, 2, 3.5 (Der Franzose P/N 10148). I can't help feeling that a ring with 0.25mm vertical clearance will very quickly destroy what is otherwise a brand new piston.
The pistons are a high domed variety, stamped, along with the usual arrow and AV, with 8.5 and an E underneath the 8.5. I'm assuming these are therefore 8.5:1 compression jobbies. Oh, and they're 74mm diameter.
The only identifying marks seem to be a casting number inside which appears to be FM with 55048 under it and an E under that. Gudgeons appear to be 20mm floating type but the circlips are also missing. (Piston has circlip grooves)
Short of buying two sets of rings (not a financially preferred option) so I can get 4x2mm compression rings, I'm wondering whether I can actually use these, and certainly what manufacturer they may be from.
Any information and/or guidance you blokes can provide will be greatly appreciated.
Cheers, Pottsy.
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