Reinhoud Posted December 13, 2019 Posted December 13, 2019 (edited) Gents, I had pistons copied by JE, I'm not impressed by what they did, but hey.. One piston has this, see red arrow. Grooves of piston rings were cut, then the bore for the wrist pin was done. Because of a lack of enough material a bump in the oil ring was created. I had to file the bump off to make the oil move in the groove without too much resistance, there for there is a gap were the wrist pin is, about 6mm, the oil ring is not supported. Is this acceptable? As in, is this going to cause trouble? One hand I would say, should be right, other hand.... I'm not too sure.. Thanks Edited December 13, 2019 by Reinhoud Quote
no class Posted December 13, 2019 Posted December 13, 2019 looks a little dodgy to me....even the oill ring groove has some abnormal machining ( yellow arrow) Quote
Reinhoud Posted December 13, 2019 Author Posted December 13, 2019 4 hours ago, no class said: looks a little dodgy to me....even the oill ring groove has some abnormal machining ( yellow arrow) I don't trust it either.. Quote
wombat258 Posted December 13, 2019 Posted December 13, 2019 I have seen a lot of race pistons in stroked car engines machined with the oil ring exposed into the wrist pin hole, and they work successfully. It is an oil scraper and does not need to form a seal on the lower ring land. If you do not like them, send them back. On a bike engine I personally would have used a piston with normal ring pack, and spaced the barrel to suit the stroked crank. Quote
Reinhoud Posted December 13, 2019 Author Posted December 13, 2019 1 hour ago, wombat258 said: I have seen a lot of race pistons in stroked car engines machined with the oil ring exposed into the wrist pin hole, and they work successfully. It is an oil scraper and does not need to form a seal on the lower ring land. If you do not like them, send them back. On a bike engine I personally would have used a piston with normal ring pack, and spaced the barrel to suit the stroked crank. The other 3 pistons are ok. I'm afraid that when the scraper turns the ends get hooked and scratch the barrel. Quote
wombat258 Posted December 14, 2019 Posted December 14, 2019 Should all be the same. What else could they have stuffed up? Send them back. 3 Quote
Reinhoud Posted February 11, 2020 Author Posted February 11, 2020 I've been in contact with JE, and they made and send me 2 new pistons, for free, without hesitation!! I'm impressed with that! Weird thing, they charged me $340 to send me 4 pistons, they only paid $103 postage to send me 2 pistons in the same size box.. Another problem solved. 3 Quote
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