Need to source original crank how can I measure etc if buying used as cant afford new for engine build. Ours looked reasonable but told its warped Sent from my SM-A405FN using Tapatalk
If you are DIY ing you will need a proper micrometer capable of measuring around 50mm. Or a Mitutoyo caliper not the £10 Chinese ones where repeatability of measurements and zero point is less than the changes in diameter you are trying to measure. If you are paying somebody a realistic price to build your engine then the cost of a crank and parts ought to be a relatively small fraction of the cost, as the paying at hourly rate for a good engine build should overwhelm the cost of parts. If your budget doesnt run to a new crank, start saving or waiting . Any random crank may need a regrind or be just as bent.. ask your builder to source a crank. Or take it all home, build it yourself and buy a crank using the labour costs you saved. Mine cost £51 off eBay plus a trip to Barry and a family hotel stay overnight in Wales . and came inside an engine case part full of water and covered in filth. The crank turned out to be a bit worn, but I put STD/STD bearings in it and the crank and case went on for 28000 miles with £600 worth of new parts.
Do you know anyone with a lathe ?, you could mount it between centres and check for any 'run out' with a DTI (dial test indicator) clock. They would probably have a micrometer to measure journals with too. I would think if it's warped it's scrap IMO.
Better start looking for one by sounds of it Know someone who has this Sent from my SM-A405FN using Tapatalk
Some engineering shops claim to be able to ‘true’ cranks. Maybe worth googling engineering shops in your area. Doing some research and getting an opinion should only cost you some time. Stirlingmoz
