- Thread starter cheb
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Agroshield
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What are the possiblities of increasing the width of the groove in the piston? That 'only' needs a lathe.
You could face 1mm off the ring on the lathe. Superglue to a flat plate (maybe inside a sacrificial 'washer' whose ID is that of the bore, to keep the ends closed and restrain the ring a little).
Edit: nothing needs to be concentric in this setup.
You could face 1mm off the ring on the lathe. Superglue to a flat plate (maybe inside a sacrificial 'washer' whose ID is that of the bore, to keep the ends closed and restrain the ring a little).
Edit: nothing needs to be concentric in this setup.
Or a pillar drill & fabricated piston holder that fits in the chuck with little or no play and a home made clamped down tool tip holder that you can slowly introduce a cutter through . (
A vertical lathe ? )
cheb
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I've done some measuring to the nearest 0.05mm*. The top two lands are 1.5mm and the oil ring land is 4.0mm The compression rings are 2.5mm and the oil ring is 3.5mm.
I'd prefer to try and machine the compression rings down in the first instance. If they snap I can try modifying the piston. What to do about filling the excess in the oil ring land. Is 0.5mm too thing for a turned down compression ring used as a packer?
*It's slightly dark, there's a cat on my lap and I don't want to disturb it by getting up to switch the light on.
I'd prefer to try and machine the compression rings down in the first instance. If they snap I can try modifying the piston. What to do about filling the excess in the oil ring land. Is 0.5mm too thing for a turned down compression ring used as a packer?
*It's slightly dark, there's a cat on my lap and I don't want to disturb it by getting up to switch the light on.
See if you can get Duoflex oil scraper rings or similar in the size you're after, they are usually in three parts so make sure they face the right way up top ring and bottom rings have an ever so small angle on the outside edge and that should be widest part , & go to the bottom of the piston ,then a wriggly wire spacer then the bottom ring again widest part tot he bottom . You usually also stagger the joins so that combustion gasses have to travel a long way before entering the crankcase . Some pistons have a pin in the ring groves that prevents you staggering oil scrapers .
Put this into your search engine for duoflex .
duoflex oil scraper piston rings uk
