stroking Posted November 1, 2010 Report Share Posted November 1, 2010 ok my boss has a vito's 10mil weld crank that has separated 3 times and working on the forth!!! this is a full drag bike with everything except straight cut gears and it happens after only 3-5 passes what CAUSES these cranks to do this......compression/timing/rpms/pto gears/???????? do the billet cranks have the same problem seems like 10mil is a unlucky stroke! Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted November 1, 2010 Report Share Posted November 1, 2010 We just had the same issue with a Vito's 10mm crank. Fucking junk if you ask me. You should call them and tell them to refund your money. Quote Link to comment Share on other sites More sharing options...
camatv Posted November 2, 2010 Report Share Posted November 2, 2010 i have a TDR 10 mill long rod crank in mine its been going strong for 5+years now. i mostly use the HOT RODS cranks for the 4 mills i have built. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted November 2, 2010 Report Share Posted November 2, 2010 All the parts might be forged in the same factory but you dont get first quality forgings for the bottom scale price. Then you have to take in the skill of the people that assemble it. Quote Link to comment Share on other sites More sharing options...
camatv Posted November 2, 2010 Report Share Posted November 2, 2010 guess as to what causes it? i'm not sure might have one sent to a metalurgist and see how good of quality the steel is its built out of? maybe its just a piece of shit? Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted November 7, 2010 Report Share Posted November 7, 2010 Are you thinking its putting side load on the crank without straight cuts?What side seems to come apart and is it the same everytime? Quote Link to comment Share on other sites More sharing options...
stroking Posted November 8, 2010 Author Report Share Posted November 8, 2010 Are you thinking its putting side load on the crank without straight cuts?What side seems to come apart and is it the same everytime? both sides have come apart ... not at the same time and whats the difference in a 115 and 120 rod 10mil ? is the 120 stronger ? i know the case is trenched deeper for the 120 Quote Link to comment Share on other sites More sharing options...
dajogejr Posted November 8, 2010 Report Share Posted November 8, 2010 Unless your crank is made of butter, there is an issue somewhere else. I've seen more billets break than forged, and there's a LOT more forged out there. If they are separating after being welded...either the welder isn't doing the job correctly, or there is a MUCH bigger problem in the motor, it's mating/bearing surfaces, something out of balance/true, etc. Now a days, all the cranks come from pretty much the same place, just different names on the box. A 120 rod is not as common for the 10 mil. There are a few 10 mil cubs with that rod, I'm not sure about the twister, and the super cubs (72mm bore) might use it. The 120 rod is available in a big pin or small pin. If it's the small pin, no extra trenching is required. The big pin has a larger bearing so that's why it needs to be trenched a hair deeper. That being said, Vito's doesn't offer the 120mm rod that I saw... I have a Vito's 10 mil in mine. It's a quality piece. I watched my buddy unbox 4 of them, NONE of them needed to be trued. He just welds all the way around the pin. I also like their new cub pistons.... While I don't agree with some of their marketing hype...I do think their products now a days are quality. Separating a crank 3 times...it's possible you got a bad one, but I'd be looking else where to be honest. Quote Link to comment Share on other sites More sharing options...
stroking Posted November 16, 2010 Author Report Share Posted November 16, 2010 well another one went out!!! another vito's 10mil...i will be taking it apart today and i'll take some pictures. i already have the cylinders off and it looks like its coming apart on both sides this time!! Quote Link to comment Share on other sites More sharing options...
dajogejr Posted November 16, 2010 Report Share Posted November 16, 2010 Please don't take this as me being a smart ass... If you put a different brand crank in the same set of cases with the same setup and it doesn't fail, I will 100% support you in saying the cranks you got from Vitos are junk. Until then, I'm convinced it is something else...and any of the cranks coming out of Taiwan would have the same issue. Quote Link to comment Share on other sites More sharing options...
stroking Posted November 17, 2010 Author Report Share Posted November 17, 2010 (edited) here you go.....i didnt remove it yet but you can see whats going on here.......this is the 4TH time this year a vito 10mil has done this 3 times in a different motor and once in this one! i was told the flywheel can cause this as well as over reving Edited November 17, 2010 by stroking Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted November 17, 2010 Report Share Posted November 17, 2010 I too agree that Vito's cranks are fucking junk. The one that went in my 10mm cub motor after I sold it to bbcmudtruck came apart twice. The first time we sent it back and they fixed it for free and sent it back for free. The second time he sold the motor and washed his hands of it. Vito's absolutely sells fucking junk 10mm cranks. Quote Link to comment Share on other sites More sharing options...
stroking Posted November 17, 2010 Author Report Share Posted November 17, 2010 (edited) well they didn't fix the others for free Edited November 17, 2010 by stroking Quote Link to comment Share on other sites More sharing options...
dajogejr Posted November 17, 2010 Report Share Posted November 17, 2010 Should never happen.... Are you guys rewelding them? Have you tried different flywheels? What kind of bearings are on them? I can see if they explode, but if they keep separating like that, different cranks no less, there is another problem. Yes, flywheel and too much over rev could certainly cause that.... I only put 40 to 50 passes on my bike this year...I have my buddy weld all the way around the pin, and no issues like that. Try another brand crank, but I have a feeling you'll be seeing the same thing again... Quote Link to comment Share on other sites More sharing options...
dajogejr Posted November 17, 2010 Report Share Posted November 17, 2010 Hate tell tell ya Tyler, but if Vito's sells junk, everyone does.... They're all made in Taiwan with different people badging their names on them. Quote Link to comment Share on other sites More sharing options...
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