Piston Rings for a 0.50 Piston.

[gazza01]

I scored an Subaru EA81 engine that has been bored out to take 0.50mm Pistons just

need  to know what size rings I should be using.

Edited May 4, 2025 by gazza01
no edit

[Turbone]

Contact these folks and ask if the have .50 rings. Also, you can look thru all the other vendors on ebay to see if someone sells the set. I tend to steer away from DNJ parts, As they are cheap chineseum stuff, but I've had good luck with Hastings and NPR

https://www.ebay.com/itm/286535946018?fits=Year%3A1984|Engine+-+Liter_Display%3A1.8L|Trim%3ABase+Hardtop+2-Door|Model%3AGL|Make%3ASubaru|Submodel%3ABase|Engine%3A1.8L+1781CC+H4+GAS+OHV+Naturally+Aspirated&_skw=Engine+Piston+Ring+Set&itmmeta=01JTGGCDK5QCYY56G3JP27C2G5&hash=item42b6df8f22:g:GRMAAOSwGV1n8-L7&itmprp=enc%3AAQAKAAABIFkggFvd1GGDu0w3yXCmi1dVY6P5gatqhuRHuVG4ciQApiO91CmKZ1GKhjuDRTL1uR8hyiSb5sbsItgmuoKoBQlCzg23eI%2BhpPrJpzKKCP4lOjPOopLM3kluSYyR%2Fc76VCR13ECk%2B7T6Iy3QfGbavPNaOIG1rLJ6m3eAYuK%2FEWNMUZLPY%2Bo%2Bud6v3Uzwmo58K%2Fg964pFpDXHq7E1XZOljK2MhX8HT5DvSWlpcB9UOcbDjoG0ai3Pr8rb1KaI%2B%2FbGScHm1YJZ326VlfMnXDQFMyh77DAvU1C%2BkXpEYnGJVNmYjI3XcOORaUDrio5A%2BiGczM9gGwQUSRqfW3TEXNW3jqgRq3cfxaRbszs1W4rijv825AENgRfUdu6o5Pr7mVfSUw%3D%3D|tkp%3ABk9SR-DZsZDUZQ

[moosens]

That’s maximum as I know it. And I can’t recall seeing 50 over.

Not many folks have bothered at that point. I cannot recall anyone with a 50 over EA anything. 
 

Good luck with it. 

[czny]

92.50 mm, either 2.0mm 1st & 2nd or 1.2mm 1st & 2nd rings, depending on engine/piston.

https://hastingspistonrings.com/catalogs-cross-reference/

https://hastingspistonrings.com/wp-content/uploads/2023/05/asian-catalog-americas.pdf

https://www.ebay.com/itm/187161728886?fits=Make%3ASubaru&_skw=subaru+92.50+mm+EA81+piston+rings&itmmeta=01JTH36YHWEVD0QXGV0YXQQ7AS&hash=item2b93b55776:g:bS0AAeSw-8loBnk~&itmprp=enc%3AAQAKAAAA4FkggFvd1GGDu0w3yXCmi1ds6hQQs5C0Aavw5a6pUKCItZ201Ll3mNujqNg%2FsDD%2FLkBJ7WFKlwnHz4MCZCGppX%2FDPCDO2CTW%2Fvzc4HYFSx3w9SyT4GZCR6X%2BQAOqWhGGlpjyupNBUSt2bDQiHwVVQrWC8j3PomzHL%2FC3cd7lS0b6r1WQN%2BzytOPdLZcBBAbGI79artDEqCIFjPgS20GvkOHTQBPMLEpKJg8wrV0ut6%2FgSomiZDBl%2BETktnc2BjmLNBg0pz0GA6%2FPT4uRkWL1yd3ExzklURJ2K4Rak9MQpInT|tkp%3ABk9SR47pm6PUZQ

Contact seller importengineparts on fleabay for NPR rings.

YMMV

 

Edited May 5, 2025 by czny

[el_freddo]

If you really love the EA82 you could have the engine sleeved. 50 thou over seems a lot. I thought 40 thou was as far as they went with new rings and pistons for the EA82. I could be wrong, I only ever rebuilt one before I really learned about them. 

Cheers 

Bennie