hodge Posted July 21, 2012 Share Posted July 21, 2012 Hi guys I've a few questions about this. Over the coming months I'll be building myself a new engine, with some tasty pistons and rods this time. I'm just wanting to get my head around everything before I start bolting stuff together. Firstly, Will a stock crank require balancing before I fit it or is it safe to say a stock Toyota crank will be balanced perfectly? Secondly, This time I will be using a stock flywheel in apose to the lightened ORC clutch and flywheel I currently have fitted and also a Titan crank pulley which the instructions say MUST NOT be balanced as its already perfectly done, so if a stock crank does need doing, will I need to fit the flywheel, clutch, spigot bearing and crank dampner when I have it balanced? Thirdly, how much does it cost to have a crank balanced, incase it needs doing so I can budget for it? Thanks John Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted July 21, 2012 Share Posted July 21, 2012 If you're going for a built and balanced engine, you can't leave such a large rotating mass as the crank out of it. Yes it will be balanced but to a wider tolerance than a crank specialist could achieve. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 22, 2012 Author Share Posted July 22, 2012 So are you saying I won't need to rebalance it then bud? Quote Link to comment Share on other sites More sharing options...
Wez Posted July 22, 2012 Share Posted July 22, 2012 For optimum performance aren't you supposed to have the crank, rods, pistons and crank dampner all balanced together? With lighter parts you could in theory run 10,000rpm with the same loadings as stock at 7,800rpm Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted July 22, 2012 Share Posted July 22, 2012 I'm no expert on balancing engines but I know about static and dynamic balancing, not sure how you could balance a crank with its rods and pistons together, unless you didn't mean as an assembly. Hodge mate, certainly get it balanced. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 22, 2012 Author Share Posted July 22, 2012 For optimum performance aren't you supposed to have the crank, rods, pistons and crank dampner all balanced together? With lighter parts you could in theory run 10,000rpm with the same loadings as stock at 7,800rpm I'm no expert on balancing engines but I know about static and dynamic balancing, not sure how you could balance a crank with its rods and pistons together, unless you didn't mean as an assembly. Hodge mate, certainly get it balanced. If it all needs balancing then that's what I'll do. I want a bulletproof engine, more for piece of mind really than anything else. Let's hope Mr. wilson see's this thread and baffles us with loads of technical info. Quote Link to comment Share on other sites More sharing options...
Wez Posted July 22, 2012 Share Posted July 22, 2012 Let's hope Mr. wilson see's this thread and baffles us with loads of technical info. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 22, 2012 Author Share Posted July 22, 2012 CHRIIIIIIIIIIS!!!!!!!!! Wake up mate. Help required Quote Link to comment Share on other sites More sharing options...
Kaan W Posted July 22, 2012 Share Posted July 22, 2012 If its a high performance engine or you want the absalute best I would buy one new, they cost around £900 shipped iirc Quote Link to comment Share on other sites More sharing options...
Tyson Posted July 22, 2012 Share Posted July 22, 2012 If its a high performance engine or you want the absalute best I would buy one new, they cost around £900 shipped iirc Say what ? Quote Link to comment Share on other sites More sharing options...
Dnk Posted July 22, 2012 Share Posted July 22, 2012 (edited) I would get the rods balanced along with the pistons and get the complete crank/clutch assembly done as well. Pistons will be a case of making them weigh exactly the same, this also goes for the rods but along with making them weigh the same overall you balance them to weigh the same from the little end to the big end and visa versa. If you fitted a new crank you'd still get it balanced to a finer tolerance Edited July 22, 2012 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
hodge Posted July 22, 2012 Author Share Posted July 22, 2012 I would get the rods balanced along with the pistons and get the complete crank/clutch assembly done as well. Pistons will be a case of making them weigh exactly the same, this also goes for the rods but along with making them weigh the same overall you balance them to weigh the same from the little end to the big end and visa versa. If you fitted a new crank you'd still get it balanced to a finer tolerance I'm going to have Chris balance my rods and pistons. I may as well speak to him about the crank too then. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 23, 2012 Share Posted July 23, 2012 The proper way is to start with the crank on its own, new ones should have decent balance, but don't always, a proper balance will get it cock on. Then add ancillaries like flywheel, then damper, then clutch, blah blah. That way each item has perfect individual balance, so if the damper gets old or fails you just need to get a new damper checked for balance, rather than stripping the engine down completely. If balanced as an assembly one or more individual items can be well out of balance whilst the whole assembly is in perfect balance IYSWIM? It is definitely worth doing, and makes a noticeable differeence to how smooth and engine feels, and saves wear and tear. There are two people I trust for balancing, and both are quite dear, but a poor balance is no better than not bothering. VERY few people can ,ake a comptent job of V8's and V10's in the UK, I have seen some right disasters. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 23, 2012 Author Share Posted July 23, 2012 Do you know off the top of you head what this would cost for a crank, and flywheel balance Chris. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 23, 2012 Share Posted July 23, 2012 Not without pulling a load of invoices out, probably circa £180 if I had to guess. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 23, 2012 Author Share Posted July 23, 2012 Sounds fair enough to me Chris. Once I get all my parts together I'll take a drive down with the crank, flywheel, pistons and rods and I'll just get the lot done in 1 go. At least I know if I leave them with you they'll be spot on when there done. Quote Link to comment Share on other sites More sharing options...
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