Phyxius Posted June 28, 2006 Share Posted June 28, 2006 Is it possible to add full counterweights to a non-fully counterweighted crank? Quote Link to comment Share on other sites More sharing options...
TimZ Posted June 28, 2006 Share Posted June 28, 2006 Is it possible to add full counterweights to a non-fully counterweighted crank? I guess you could weld them on, but as the stock crank is forged, I would think that you'd be risking compromising the overall strength of the crank. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted June 28, 2006 Share Posted June 28, 2006 Heavy metal can be added to the crankshaft throws to balance it. A competent engine machine shop should be able to do this. What is your application? Quote Link to comment Share on other sites More sharing options...
olie05 Posted June 28, 2006 Share Posted June 28, 2006 in some cases aren't they bolted on as well as welded? or is it one or the other? Quote Link to comment Share on other sites More sharing options...
Mack Posted June 28, 2006 Share Posted June 28, 2006 i think the VE30de engines form the 92 to 94 maxima SEs had bolted on counterweights. Quote Link to comment Share on other sites More sharing options...
Phyxius Posted June 28, 2006 Author Share Posted June 28, 2006 I'm just wondering if there is something we can do to improve the harmonics of the stock L series cranks. If it is as simple as bolting or welding some more metal on, I may try it. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted June 28, 2006 Share Posted June 28, 2006 There are fully counterweighted cranks out there already. I think SCAT makes one, and someone will ocassionally link to a Japanese page which shows one in a catalog or on an auction site. I want to say that the scat runs $2500 or $3000 IIRC, and I think AZC used to carry it about 10 years ago, back when they sold a tube chassis. Remember those??? Quote Link to comment Share on other sites More sharing options...
Phyxius Posted June 28, 2006 Author Share Posted June 28, 2006 that was before my time but the question still stands... is it possible to weld or bolt on weights to a crank not made for it? And if so, which would be the better option? Quote Link to comment Share on other sites More sharing options...
olie05 Posted June 28, 2006 Share Posted June 28, 2006 There are fully counterweighted cranks out there already. I think SCAT makes one, and someone will ocassionally link to a Japanese page which shows one in a catalog or on an auction site. for example, kameari. I want to say that the scat runs $2500 or $3000 IIRC, and I think AZC used to carry it about 10 years ago, back when they sold a tube chassis. Remember those??? wow. I was born one dacade too late. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted June 28, 2006 Share Posted June 28, 2006 Without seeing the crank to know what and where you are asking to add weight, it's almost impossible to comment. But if there are main journals that have no counterweight and you want to add one, then the answer would probably be no it can't be done. The big question is why would you want to? Reason that question comes up is that there is a limit to the hp that the l28 can make. If your wanting more, then you'll have to change engines. Adding counterweight to a crank isn't going to increase HP. Quote Link to comment Share on other sites More sharing options...
Phyxius Posted June 28, 2006 Author Share Posted June 28, 2006 The goal was to be able to reduce the harmonics of the crank so that it could spin faster reliably... not necessarily to increase HP Quote Link to comment Share on other sites More sharing options...
JMortensen Posted June 28, 2006 Share Posted June 28, 2006 Spin faster = more hp. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted June 28, 2006 Share Posted June 28, 2006 I believe that with the right tools and skills in place, it can be done. I don't see why not? And changing motors is not the ONLY solution to making more power. Quote Link to comment Share on other sites More sharing options...
Phyxius Posted June 28, 2006 Author Share Posted June 28, 2006 Spin faster = more hp. right... but hp is not the goal. I'm pretty much purely bench racing here. There is a problem with the harmonics of the L series cranks at high RPMs... I'm just trying to see if we could come up with a solution to that problem using tools and parts readily available. The fact that it may not be worth the effort or useful at all is beside the point. Quote Link to comment Share on other sites More sharing options...
naviathan Posted June 28, 2006 Share Posted June 28, 2006 Wouldn't it be easier to just balance the crank by removing material? Quote Link to comment Share on other sites More sharing options...
Phyxius Posted June 28, 2006 Author Share Posted June 28, 2006 the problem...at least the way I see it... is that there aren't counterweights for every rod journal... there are a couple missing. I'm not really sure why they decided to do this. Quote Link to comment Share on other sites More sharing options...
Mack Posted June 29, 2006 Share Posted June 29, 2006 From the looks of it, you'd have to take all of the existing counterweights off and start over from scratch. it looks like the stock l series cranks share counterweights between some of the throws. Quote Link to comment Share on other sites More sharing options...
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