Guest vvega Posted February 8, 2008 Share Posted February 8, 2008 Seriously, dont do it yourself...Quite a few years back now, there was an incident on an Auckland Motorway, where a truck suffered driveshaft failure, due to an incorrectly lengthend driveshaft. The truck spat the shaft out the side while doing 90kph, shaft went onto the otherside of the motorway, and impaled a guy in the head in his ute, the ute cab was serverly shortened as was the guys life. Simply put, Never mess with a rotating mass, always get a pro to do it. its atually because of this there now going apeshit on loops i hate the fucken things so im going to teh effort of new tube bigger yoke's etc so that i can have a specialist report done not to need them Quote Link to comment Share on other sites More sharing options...
WDE_BDY Posted February 8, 2008 Share Posted February 8, 2008 DELETED Quote Link to comment Share on other sites More sharing options...
crazy_rich Posted February 8, 2008 Share Posted February 8, 2008 I work at angineering shop that modifies and balances d/shafts, you'd be surprised at the ltsa regulations we have to follow to be able to legally do them. Theres obviously a reason for this so don't do it yourself. driveshaft loops need to be at least a 50x5 steel loop 360 deg around the driveshaft within 150mm behind the front UJ, or so Wayne Martin the local cert dude has requested of me. He also requests a certificate from an approved engineering company to ensure that your driveshaft has been balanced. Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted February 9, 2008 Share Posted February 9, 2008 Yeah, safety loop is now basically compulsory for cert, and two piece shaft can end up requiring two loops depending on universal placement.Callum pritty much its gunna cost me 200 for the report that will make teh inspector happy + the cost of the parts (do all the labour etc myself) but to be honest id rather be sure there strong enough than be worried they would snap or shatter teh uni's Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted February 9, 2008 Share Posted February 9, 2008 The NZ hobby car technical manual has all the goss on tailshaft loops. I'd like to run one one day. (Shit, i'd like a lot of things) I've ussually got my old man to shorten mine for me. We sus out the length, then set up the shaft in a lathe, and used a fine parting tool to remove the factory weld onto one half of the yolk at one end. After thats out, use a parting tool again to shorten the shaft by the desired amount. The stick the shaft in the vise with a small spacer on the universal cross end cap on the untouched end with a spirit level on it. Rotate the shaft until the level is dead level. The tap the other end part way in. Lay the same spacer on the end which you're refitting and rotate untill it is dead level also. Then tap it all the way home, and reweld it to the tailshaft tube. Then re assemble the whole lot, and if you can affford it have the shaft rebalanced. I'm fairly sure providing the welds on the shaft look competent, all you need is a recipt for having had the shaft balanced. Quote Link to comment Share on other sites More sharing options...
WDE_BDY Posted February 10, 2008 Share Posted February 10, 2008 DELETED Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted February 10, 2008 Share Posted February 10, 2008 it was teh cert mans idea he set forth what hoops i had to jump though to not use teh hoops and hes satasfied that ive exceeded his expectations every inspector is different but then were a well respected engineerign firm in hams and he has confidance that i know what im doing we also do a bit of engineering specailty stuff for a lot of race cars. so have a proven trac record of safety and workmanship v Quote Link to comment Share on other sites More sharing options...
NewGuy Posted February 11, 2008 Author Share Posted February 11, 2008 Alright well i found the place in Tauranga that does them. Colston Landon Engineering Ltd 162 First Ave West Tauranga 0-7-578 4173 Seem like pretty helpful guys, Ball park Figure of $120 without seeing the job. With Balance etc. So that one is in the Bag Quote Link to comment Share on other sites More sharing options...
RT Posted February 11, 2008 Share Posted February 11, 2008 any idea what to do about a hoop when your car is mega low? like, the big hoops you get from teh V8 shop look grossly over-large.. I was thinking of making a small one myself and mounting it onto where the original universal for my factory 2-peice driveshaft.. Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted February 11, 2008 Share Posted February 11, 2008 so say you have 3 inch drive shaft make a 4 inch id hoop, use a piece of pipe wih a 5mm wall thickness. mount as close to front uj as you can, must be within 150mm of every front uj there is in the system. two piece shafts must have to hoops. maby mount the hoop off rear of gearbox if the box allows so this way you can make a close tollerence hoop and it will move with the drive shaft. Quote Link to comment Share on other sites More sharing options...
shizzl Posted February 11, 2008 Share Posted February 11, 2008 i think putting in a extra hoop in a factory 2 piece system i bogus..the carrier should never fail,no shoul the uni there,if it does the driveshat would just fall out of the box and tumble away,and if your car has that much power to bust a shaft then itll be too low to go flying out the side anyway.. IMO just one hoop at the front is enough Quote Link to comment Share on other sites More sharing options...
peteretep Posted February 11, 2008 Share Posted February 11, 2008 yeah but you drive a matt black escort just get a single piece driveshaft, 2 peices are lame Quote Link to comment Share on other sites More sharing options...
WDE_BDY Posted February 11, 2008 Share Posted February 11, 2008 DELETED Quote Link to comment Share on other sites More sharing options...
shizzl Posted February 11, 2008 Share Posted February 11, 2008 yeah but you drive a matt black escort fair call... Quote Link to comment Share on other sites More sharing options...
Raizer Posted February 12, 2008 Share Posted February 12, 2008 Risks of a driveshaft failure are not just polevault (not likely on 2 piece shaft), lots of cars have brake lines, fuel lines and handbrake cables running down the tunnel which will mess your shit up at high speed if they wrap around a broken driveshaft. Think Loceda knows a guy in US who had this problem, but add airlines for airbags....Assess the risk, use your brain and you will see why these laws are in place. Callum I had the handbrake cable wrap around 1/2 the drive shaft in my old mk4 Tina, really not nice at 100K!!Front 1/2 of the shaft ripped a big whole through one of the chassis rails and put a few holes in the floor before hitting the ground hard and snapping the center uni and carrier which let the rear 1/2 loose. All because the crappy rubber dough nut at the front of the shaft let go Quote Link to comment Share on other sites More sharing options...
Spencer Posted February 12, 2008 Share Posted February 12, 2008 so if I went for a cert with a engine conversion and one of my random toyota 2piece shaft bits make the conversion work (as they do). would you still need loops? cos its all factory shit. And that mark 2 that broke the shaft and popped his air lines was messy! shouldve had bumps tho so it didnt lay frame in a failure Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted February 12, 2008 Share Posted February 12, 2008 so if I went for a cert with a engine conversion and one of my random toyota 2piece shaft bits make the conversion work (as they do). would you still need loops? cos its all factory shit.And that mark 2 that broke the shaft and popped his air lines was messy! shouldve had bumps tho so it didnt lay frame in a failure im my case i had to prove that that driveshaft came out with that engine and gearbox making stock hp if you upp the hp...your fucked for that equation next step is you have to have a reconised profesional signoff to say that the driveshaft will nto brake has oversized universals and the prop wall is of suffitaint thickness for you application... its a hell of a fuck around not to run them but reality is for me there almost impractical to install Quote Link to comment Share on other sites More sharing options...
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