K-O-H 2013 With LR content

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Originally Posted by isuzurover

Well done on the win. Good luck for KOH.

Just a shame they could not have swapped to non-stickys and hydro-assist steer before the race...

(I see they have lights on the roof - that must mean they are lame according to another thread on here...)

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I think that would be a huge undertaking. The truck is RHD, but the panhard runs the opposite way to normal and is quite short. They probably dont even have room for the steering box or shafts from steering wheel to box. Then of coarse there are the mounts at the axle ends for drag link and trackrod....

Here is a link to one of the better built rigs in the same race/mod class. Look at the lengths Jesse has gone to to keep mechanical steering in a small tight package (btw he and others actually think mechanincal has advantages over full hydro) This car finished 6th over all...

JHF Mod Class KOH racer - Prepping for 2013 - Pirate4x4.Com : 4x4 and Off-Road Forum

btw from what I can gather there were 59 or so starters in this race and only 6 finished :eek:

They are still running.. currently at mile marker 74ish.

Just watched them up aftershock on the main feed.

Car looks good so far...

live tracking here:

http://vulcain.iritrack.net/irc/eviewer/KOH-2013/

Looks like they are out.. didnt move for ages on the tracking, and now showing as off the course

:(

sounds like they may have had another rear A frame/ball joint failure, but fixed that and keep going. But now out due to possible crown wheel failure.

Ill speculate that if the ball joint falled and the had axle rotation, and that along with running tru hi9 R+P (coast side) contributed to crown wheel failure...


thats how im calling it with little to zero info and from 10billion miles away sitting behind my keyboard (wheeling the crap out of it mind you)

Rear crown wheel did fail quite spectacularly:

https://www.aulro.com/afvb/images/im...013/02/867.jpg
https://www.aulro.com/afvb/images/im...013/02/868.jpg

I went by the garage and hung out with the guys this morning as they tore down the rear end so they could take the crew out on some fun runs up chocolate thunder later in the day. In addition to the crown wheel being a bit second hand, the small needle bearing that the end of the pinion sits in was about 75% gone. Only thing that remained was about half of the outer metal shell that the needles seat in. The rest of the shell had been ground through.

From what they said the rear let go on the second lap right near hwy 19. We were waiting at the entrance to wrecking ball for them to come through. After the leaders made their second lap we went to the start finish line and found the racer in the garage. The rate of attrition was high this year: 127 trucks started, 30 finished :o

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Originally Posted by psykokid

The rate of attrition was high this year: 127 trucks started, 30 finished :o

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I'm surprised that many got through Sledgehammer! They'd just about need another vehicle in the hole to get through it

Would be very intersing to know why it failed? How much the A Frame/ball joint failures contributed, the fact they are running on the coast side of R&P causing large side forces.

Does anyone know if they were running load bolts/pegged diff?

I suspect the narrowed bearing spacing on the carrier doesnt help either,but not much can be done about that if running in a Rover housing...

On the rear diff it was not pegged..

I would suspect the needle roller bearing on the end on the pinion failed due to the side forces of running the high 9 gears on the coast side, then the gears come partly out of mesh and the teeth then come off, these needle bearings have failed before on the rear 4.11 true high 9 gears that Jim was previously running, as per my previous post, the problem is running the true high 9 gears on the coast side, pegging may have helped but it is just a way of trying to contain this side force, to make it reliable you have to change the tooth pressure angles like we have with our force 9 ring and pinions, I have shown true high 9 how to do this about 2 years ago but I don't think they have done it on any yet, certainly Jim's ones were not modified,

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Originally Posted by uninformed

yes I agree Ben, I was thinking hmmmm....very thin for that area. And was also wondering if round tube the best shape for the job (cough, cough John)

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Originally Posted by Bush65

... On a weight vs strength basis round tube is the best section for pure tension or compression members.

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Further to that last comment, the legs of an A-frame are not links in the true meaning of link (can resist only axial loads).

Many years ago, I was contemplating a triangulated 4 link for the rear of my bushie. The problem was that the chassis rails are too close together and the triangulation angle is too low, resulting in high forces unless you use short upper links.

The high axial plus bending forces from the low angle in an A-frame, are probably why the stock unit has such massive arms. The longer A-frame in the GP rover will suffer even more.