prelit Posted January 3, 2020 Report Share Posted January 3, 2020 (edited) Hi guys, Can anyone help me with the standard piston bore size of the 240 (212cc) engine to the nearest mm. if anyone has a scrap piston available and has time I would also like to know the gudgeon pin diameter, crown height from pin center to piston crown and the overall piston height. These can be just a ruler measurement. Thanks in advance, Prelit Edited January 3, 2020 by prelit Quote Link to comment Share on other sites More sharing options...
Bilko Posted January 3, 2020 Report Share Posted January 3, 2020 (edited) If it's Fantic 240 your after 69x56,5 mm Edited January 3, 2020 by Bilko Quote Link to comment Share on other sites More sharing options...
Bilko Posted January 3, 2020 Report Share Posted January 3, 2020 Good source for info https://fantic240pro.pagesperso-orange.fr/ukindex.htm Quote Link to comment Share on other sites More sharing options...
prelit Posted January 3, 2020 Author Report Share Posted January 3, 2020 Thanks for the info and link Bilko, much appreciated. 1 Quote Link to comment Share on other sites More sharing options...
midlife Posted January 4, 2020 Report Share Posted January 4, 2020 bore 69mm ,overall hieght 75mm, center pin to crown32mm, pin dia 18mm There is also letter stamped on crowm A to G Quote Link to comment Share on other sites More sharing options...
prelit Posted January 4, 2020 Author Report Share Posted January 4, 2020 Thanks Midlife for taking the time to measure those dimensions for me. I believe the the Fantic barrel was plated, has anyone got any experience with running the piston in a cast iron liner. I guess in theory the piston ring wouldn't be 100% compatible but can you get away with it? I bit of premature wear doesn't bother me. Cheers, Prelit. Quote Link to comment Share on other sites More sharing options...
huski Posted January 4, 2020 Report Share Posted January 4, 2020 Why do you want to try a cast iron liner?is the cylinder deeply scored.Theres companies out there that can repair seriously damaged cylinders and replate them Quote Link to comment Share on other sites More sharing options...
prelit Posted January 4, 2020 Author Report Share Posted January 4, 2020 Hi Huski, I'm not wishing to run this piston in a Fantic barrel. I'm just after a 68mm to 70mm piston to run in an alloy barrel with a cast liner. Thanks, Prelit. Quote Link to comment Share on other sites More sharing options...
huski Posted January 4, 2020 Report Share Posted January 4, 2020 I put 2 and 2 together and made 5.Cant see a problem with what you propose Quote Link to comment Share on other sites More sharing options...
section swept Posted January 5, 2020 Report Share Posted January 5, 2020 Provided the piston rings are suitable. You can’t run chrome rings in a chrome bore, they’ll eat each other! You can run chrome rings in a cast iron bore. The top ring is usually chrome to deal with the high heat of combustion. Quote Link to comment Share on other sites More sharing options...
prelit Posted January 6, 2020 Author Report Share Posted January 6, 2020 Thanks for the prompt replies guys, Does anyone know the material of the Fantic piston ring and if the barrel chrome, nikasil, plasma or something else? Cheers, Prelit. Quote Link to comment Share on other sites More sharing options...
section swept Posted January 8, 2020 Report Share Posted January 8, 2020 Chrome rings will be shiny just like chrome. Plain rings will be greyish to polished grey where they rub against cylinder wall. Chrome bore will be easy to spot as it will be much shinier than cast iron bore. You will also see where the plating finishes on the bottom of the barrel/bore. Obviously chrome bores cannot be bored out, unlike a cast bore which can be oversized by reboring. Nikasil and other types of surface hardening processes are harder to define, try a Google search ? Quote Link to comment Share on other sites More sharing options...
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