[vid] what happens when you borrow the wrong wheels
Do you know why this happened?
06-12-2007, 06:49 PM
#5
Le Mans Master
My guess was going to be that the loaner wheels have a flange bore
that is smaller than the diameter of the shoulder on the hub on this RX7.
Meaning that the wheel flanges didn't seat tight against the hubs and the
resulting forces popped the ends off all the wheel studs/bolts.
Driver's and passenger's rear hubs.
Interesting to see them all fail nearly simultaneously.
Was this the first run on the wheels or had the car already been on
track?
.
that is smaller than the diameter of the shoulder on the hub on this RX7.
Meaning that the wheel flanges didn't seat tight against the hubs and the
resulting forces popped the ends off all the wheel studs/bolts.
Driver's and passenger's rear hubs.
Interesting to see them all fail nearly simultaneously.
Was this the first run on the wheels or had the car already been on
track?
.
06-12-2007, 11:09 PM
#7
Le Mans Master
Roger Penske invented this type of tire change for Mark Donohue's Trans Am pit stops. He glued the lug nuts to the wheel to save time.
I think something was lost in translation, however, 'cause I'm pretty sure that the Penske crew also used torque to seat those little buggers, in addition to the glue;-)
I think something was lost in translation, however, 'cause I'm pretty sure that the Penske crew also used torque to seat those little buggers, in addition to the glue;-)
06-13-2007, 01:34 AM
#8
Safety Car
I thought that was a joke when I first saw it happened, rarely even in a bad situation would all 4 just pop off at the same time.
He really didnt need to put on the parking brake, the car wasnt going anywhere.
He really didnt need to put on the parking brake, the car wasnt going anywhere.
06-13-2007, 11:40 AM
#9
Melting Slicks
Member Since: May 2004
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from what I've read he got new lug nuts that were not the same diameter/thread count. Some how managed to torque them down but once pressure was applied the threads all slipped off...
06-13-2007, 11:54 AM
#10
Burning Brakes
06-13-2007, 12:25 PM
#11
Le Mans Master
Originally Posted by go_speed_go
Hello all,
I was at the event and know the guy who owns the car. (No it wasn't me)
I was in the paddock area next to him changing wheels at the same time as him. I watched him torque all of them. I even borrowed his torque wrench to tighten mine (I always forget something after I get on the road).
He went to a wheel/tire business and asked for spline drive lug nuts for his particular make/model/year car for the Enkeis, and that's what they gave him. He did not purchase the tires or wheels from them, just the lug nuts.
The lug nuts where sheared off the studs. Several members lifted a corner of the car to slide a jack underneath it. With a few more jacks, blocks of wood, etc, they were able to mount the stock wheels and stock lugs nuts (at least 3 per wheel) back on, torque them and drive the car off course. The design of the car, possilbly for aerodynamics, tucks all mechanicals on the underside a little higher than the body line, or lowest part of the brake rotors. Not even the exhaust was really scratched.
I'm not a mechanic, but the mechanics theories there was that the lug nuts where the incorrect size, but they were just small enough to grip the outer edge of the threads (as I mentioned, they torqued to 75-80 ft/lbs without complaint).
Hopefully, the only damage is to the body and brakes.
I was at the event and know the guy who owns the car. (No it wasn't me)
I was in the paddock area next to him changing wheels at the same time as him. I watched him torque all of them. I even borrowed his torque wrench to tighten mine (I always forget something after I get on the road).
He went to a wheel/tire business and asked for spline drive lug nuts for his particular make/model/year car for the Enkeis, and that's what they gave him. He did not purchase the tires or wheels from them, just the lug nuts.
The lug nuts where sheared off the studs. Several members lifted a corner of the car to slide a jack underneath it. With a few more jacks, blocks of wood, etc, they were able to mount the stock wheels and stock lugs nuts (at least 3 per wheel) back on, torque them and drive the car off course. The design of the car, possilbly for aerodynamics, tucks all mechanicals on the underside a little higher than the body line, or lowest part of the brake rotors. Not even the exhaust was really scratched.
I'm not a mechanic, but the mechanics theories there was that the lug nuts where the incorrect size, but they were just small enough to grip the outer edge of the threads (as I mentioned, they torqued to 75-80 ft/lbs without complaint).
Hopefully, the only damage is to the body and brakes.
Originally Posted by motoring
It is possible they gave him 1/2 nuts instead of the 12x1.5. the size difference is enough they may fit together but would have zero strength.
75-80 lbs/ft uneventfully on 12M-1.5 studs.
There's more to it than this.
An unfortunate event, I happen to really like the last generation RX7.
The silver lining is that the outcome wasn't worse.
.
06-13-2007, 05:33 PM
#13
Burning Brakes
Here's some commentary that I found on the event that confirms some of what has been said:
"Hello all,
I was at the event and know the guy who owns the car. (No it wasn't me)
I was in the paddock area next to him changing wheels at the same time as him. I watched him torque all of them. I even borrowed his torque wrench to tighten mine (I always forget something after I get on the road).
He went to a wheel/tire business and asked for spline drive lug nuts for his particular make/model/year car for the Enkeis, and that's what they gave him. He did not purchase the tires or wheels from them, just the lug nuts.
The lug nuts where sheared off the studs. Several members lifted a corner of the car to slide a jack underneath it. With a few more jacks, blocks of wood, etc, they were able to mount the stock wheels and stock lugs nuts (at least 3 per wheel) back on, torque them and drive the car off course. The design of the car, possilbly for aerodynamics, tucks all mechanicals on the underside a little higher than the body line, or lowest part of the brake rotors. Not even the exhaust was really scratched.
I'm not a mechanic, but the mechanics theories there was that the lug nuts where the incorrect size, but they were just small enough to grip the outer edge of the threads (as I mentioned, they torqued to 75-80 ft/lbs without complaint).
Hopefully, the only damage is to the body and brakes"
"Hello all,
I was at the event and know the guy who owns the car. (No it wasn't me)
I was in the paddock area next to him changing wheels at the same time as him. I watched him torque all of them. I even borrowed his torque wrench to tighten mine (I always forget something after I get on the road).
He went to a wheel/tire business and asked for spline drive lug nuts for his particular make/model/year car for the Enkeis, and that's what they gave him. He did not purchase the tires or wheels from them, just the lug nuts.
The lug nuts where sheared off the studs. Several members lifted a corner of the car to slide a jack underneath it. With a few more jacks, blocks of wood, etc, they were able to mount the stock wheels and stock lugs nuts (at least 3 per wheel) back on, torque them and drive the car off course. The design of the car, possilbly for aerodynamics, tucks all mechanicals on the underside a little higher than the body line, or lowest part of the brake rotors. Not even the exhaust was really scratched.
I'm not a mechanic, but the mechanics theories there was that the lug nuts where the incorrect size, but they were just small enough to grip the outer edge of the threads (as I mentioned, they torqued to 75-80 ft/lbs without complaint).
Hopefully, the only damage is to the body and brakes"
Last edited by Norm_427; 06-13-2007 at 06:09 PM.
I like the shorts with red driving shoes he was sporting. It looked a little ghey!! 