M_Dragan Posted July 27, 2018 Share Posted July 27, 2018 (edited) Hey guys, my brother is building an engine alongside me. He had to have the engine bored to .020 over and his new Weisco pistons are all about 61 grams lighter than stock and weigh within a gram or two of eachother. I was reading that since the 2JZ engine is naturally balanced that it's fine to leave as-is but I don't want to mislead him. Does he have to balance his crank? FYI: stock crank, stock rods, ACL bearings, max of 600hp, and max 6,200RPM like my build. Edited July 27, 2018 by M_Dragan Quote Link to comment Share on other sites More sharing options...
NewZed Posted July 27, 2018 Share Posted July 27, 2018 Is there a question? Just curious. It's a Toyota engine? Quote Link to comment Share on other sites More sharing options...
M_Dragan Posted July 27, 2018 Author Share Posted July 27, 2018 Just now, NewZed said: Is there a question? Just curious. It's a Toyota engine? Sorry. Question was supposed to be whether or not balancing the crank was completely necessary given what he's doing. Quote Link to comment Share on other sites More sharing options...
M_Dragan Posted July 27, 2018 Author Share Posted July 27, 2018 I edited the topic Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 27, 2018 Share Posted July 27, 2018 (edited) From pictures, it looks like the crank is fully counterweighted, so make sure your pistons, rods and hardware all weigh the same and you should be good. It might be a good idea to check the balance of the crank by itself if you intend to spin it fast. Edited July 27, 2018 by SleeperZ Quote Link to comment Share on other sites More sharing options...
M_Dragan Posted July 27, 2018 Author Share Posted July 27, 2018 54 minutes ago, SleeperZ said: From pictures, it looks like the crank is fully counterweighted, so make sure your pistons, rods and hardware all weigh the same and you should be good. It might be a good idea to check the balance of the crank by itself if you intend to spin it fast. Can anyone confirm this? I had it spun and the crank is straight and everything Quote Link to comment Share on other sites More sharing options...
seattlejester Posted July 27, 2018 Share Posted July 27, 2018 Hmm haven't heard of anyone getting a crank counter weighed just for lighter pistons. I've heard of balancing rotating assemblies which usually require the crank. If it is a serious build like that he may want to query a serious builder like real street who builds tons of these. In my head though given the way they move and how it is inherently balanced, I would think similarly as SleeperZ and you in that it probably is not required. I will say it never came up in conversation with my machine shop when I was planning on building my 7mgte. Quote Link to comment Share on other sites More sharing options...
Geno750 Posted July 27, 2018 Share Posted July 27, 2018 In the grand scheme of things, the cost to balance a rotating assembly is pretty low, and is worth doing. Especially if you're changing out the clutch/flywheel and crank pulley (unless using a Fluidampr pulley). Quote Link to comment Share on other sites More sharing options...
M_Dragan Posted July 28, 2018 Author Share Posted July 28, 2018 1 hour ago, seattlejester said: Hmm haven't heard of anyone getting a crank counter weighed just for lighter pistons. I've heard of balancing rotating assemblies which usually require the crank. If it is a serious build like that he may want to query a serious builder like real street who builds tons of these. In my head though given the way they move and how it is inherently balanced, I would think similarly as SleeperZ and you in that it probably is not required. I will say it never came up in conversation with my machine shop when I was planning on building my 7mgte. Yeah maybe I'll write them an email. I don't really want to do it if I don't have to Quote Link to comment Share on other sites More sharing options...
M_Dragan Posted July 30, 2018 Author Share Posted July 30, 2018 UPDATE: realstreet performance says the crank doesn't have to be balanced. As long as the internals are balanced to each other, as in rods equal the same weight as eachother and pistons equal the same weight, it's good to go. Quote Link to comment Share on other sites More sharing options...
Neverdone Posted July 30, 2018 Share Posted July 30, 2018 If you already have the crank out, why not balance it? There's a place near me that only charges 70 dollars to do that. If you're going high horsepower, isn't that a nice assurance to have for pretty cheap. Quote Link to comment Share on other sites More sharing options...
NewZed Posted July 30, 2018 Share Posted July 30, 2018 On 7/27/2018 at 11:31 AM, M_Dragan said: his new Weisco pistons are all about 61 grams lighter than stock and weigh within a gram or two of eachother. So, the pistons aren't the "same" weight. What are you going to recommend? Quote Link to comment Share on other sites More sharing options...
M_Dragan Posted July 31, 2018 Author Share Posted July 31, 2018 8 hours ago, NewZed said: So, the pistons aren't the "same" weight. What are you going to recommend? The pistons aren't the same weight as stock. The pistons weights are equal to eachother though. Same with rods Quote Link to comment Share on other sites More sharing options...
M_Dragan Posted July 31, 2018 Author Share Posted July 31, 2018 8 hours ago, Neverdone said: If you already have the crank out, why not balance it? There's a place near me that only charges 70 dollars to do that. If you're going high horsepower, isn't that a nice assurance to have for pretty cheap. Because it doesn't need to be done, here in California I can't find a place less than $100 to balance my crank. They said the crank it balanced without the internals, so as long at the internals are balanced to eachother (which they are) it's okay. Quote Link to comment Share on other sites More sharing options...
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