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Post by deecee on Dec 2, 2014 12:25:01 GMT 12
hi all,
Currently looking at fabricating the driveshaft loops for my friends R30 Skyline and am wondering whether I can mount the driveshaft loops to the transmission tunnel with the doubler plates on the other side.
Most examples of driveshaft loops I have seen, use flat bar in a horizontal position to mount to the underside of the floor pan, but I would like to package the driveshaft loop more efficiently within the space of the transmission tunnel.
Any guidance would be appreciated.
Thanks Dave
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Post by Leon on Dec 2, 2014 12:50:59 GMT 12
Hi Dave,
Yes you can mount to the transmission tunnel with doubler plates.
From the Hobby Car Technical Manual 5.22.3 A drive-shaft safety loop fitted to a low volume vehicle must be attached either: (a) directly to, or incorporated within, a chassis or sub-frame rail, or a rigid cross-member; or (b) where it is not practicable to attach a drive-shaft safetyloop to a chassis or sub-frame rail, or rigid cross-member, to the vehicle floor using doubler plates which have a minimum mating area of 3000 square mm, and are as close to square as can be practically achieved.
Supplementary information to that: 5.22.3 A typical size plate meeting the requirement of 3000 square mm would be a 50 mm x 60 mm plate, or larger.
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Post by deecee on Dec 3, 2014 19:17:11 GMT 12
Thanks for confirming
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Post by deecee on Jan 3, 2015 11:19:15 GMT 12
Good morning, Blue lines indicate position relative to the centre of the joint. Is the loop acceptable in this position as the flat bar and reinforcement plate would be against flat metal vs contoured (can't distinguish from pic sorry) and we have to avoid interference with the handbrake cable. Just want to ensure that the position is correct to ensure that in the event of a failure, that the loop would function as required. Cheers Dave
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Post by Leon on Jan 5, 2015 7:55:30 GMT 12
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Post by deecee on Jan 5, 2015 11:15:45 GMT 12
Where I want to position the loop is within 100mm of the universal. I am trying to clarify if the position of the loop as indicated by the blue lines, is acceptable as it relates to failure scenarios. Left hand side of pic is rear of car, right hand side is front/engine of car.
Within the specified range of up to 250mm from the universal, failure may from the universal letting go or the shaft twisting and breaking. Maybe I am over-analysing this, but if the shaft fails 30mm behind the universal to shaft weld, then the loop is not going to perform it's function.
Or is it accepted that if the loop is withing the defined range from the universal, it can be certified on the assumption that most common cause of DS failure is the universal?
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Post by Leon on Jan 5, 2015 14:20:10 GMT 12
Hi David,
I think I now see more clearly what you are asking.
The scenario the driveshaft safety loop is written for is the one where the front of the shaft drops to the ground and you polevault, or causes a lot of damage as the broken end spins. So yes, the expected failure point is the joint, or the where the tube is welded to the joint.
That is not to say that this is the only possible failure point. So, if you are concerned, you are perfectly welcome to have further loops, if you want to contain the potential energy involved in a driveshaft failure. Our requirements on safety loops are the minimum, rather than a maximum.
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Post by deecee on Jan 5, 2015 15:06:34 GMT 12
Thanks for the explanation and perspective of minimum requirements. I was wondering how to interpret the guidance and now I have a better feel for how to move forward.
Cheers Dave
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Post by vgturbo on Sept 18, 2016 13:23:12 GMT 12
Sorry to dig up an old thread ive got mine mounted to the tunnel in my ute but im having thoughts on weather theyll pass, they're held on with 4 16mm bolts solid as houses but is only being mounted to the top of the tunnel to spec? Heres a pic of the loops ( red dots are the holes)
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Post by Leon on Sept 19, 2016 8:06:33 GMT 12
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Post by vgturbo on Sept 19, 2016 8:31:19 GMT 12
O sorry yea i have bolted it to double plated 6mm plate on otherside of tunnel but just was curious if that would pass as its only mounted to top of the tunnel, not to 2 separate points like alot of loops that are around
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