Re: [MBZ] transmission rebuilding bad vibrations BS
I get it now and retract my previous question. I had thought the original post said that the speedo would have to read 160 to hit 80mph rotational speed. I re-read and realize it says no such thing. -Curt Date: Sun, 2 Mar 2014 21:39:37 -0700 From: Craig diese...@pisquared.net To: Mercedes Discussion List mercedes@okiebenz.com Subject: Re: [MBZ] transmission rebuilding bad vibrations BS Message-ID: 20140302213937.91f011096ef5b38a29978...@pisquared.net Content-Type: text/plain; charset=US-ASCII On Mon, 03 Mar 2014 14:36:50 +1030 Hendrik and Fay heni...@gmail.com wrote: This is all very confusing but I need to know the science behind it, otherwise I'll have to believe in magic, as that is the only explanation I can think of as to why a tire would spin at twice the normal speed. With an ordinary, non-limited slip, non-Torsen differential, if both rear wheels are turning at the same rate, as in driving down a straight, dry road, they will go the speed indicated by the speedometer. If one wheel is held still and the other is allowed to rotate freely, like with the car on jack stands or with one wheel on ice and one wheel on dry pavement, the wheel that is rotating will rotate with twice the speed indicated by the speedometer. That's how an ordinary differential works. Craig ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] transmission rebuilding bad vibrations BS
Here are some illustrations and explanations: http://en.wikipedia.org/wiki/Differential_%28mechanics%29 Go down the page to functional description. I think of the drive shaft turning the axles on the planetary gears. When the planetary gear attached to one axle is stopped, the planetary gear attached to the other axle starts spinning. Its motion (rpm) is added to the motion (rpm) of the ring gear which is turning the whole planetary assembly. Gerry.whose explanations are usually clear as mud. -- On 3/2/2014 11:57 PM, Dieselhead wrote: On Mon, 03 Mar 2014 14:36:50 +1030 Hendrik and Fay heni...@gmail.com wrote: This is all very confusing but I need to know the science behind it, otherwise I'll have to believe in magic, as that is the only explanation I can think of as to why a tire would spin at twice the normal speed. With an ordinary, non-limited slip, non-Torsen differential, if both rear wheels are turning at the same rate, as in driving down a straight, dry road, they will go the speed indicated by the speedometer. If one wheel is held still and the other is allowed to rotate freely, like with the car on jack stands or with one wheel on ice and one wheel on dry pavement, the wheel that is rotating will rotate with twice the speed indicated by the speedometer. That's how an ordinary differential works. Craig Right, and the physics of how a differential is normally built, and the usual engine rotation direction cause the right rear (driven) wheel to turn/slip more if all things are equal. On the front drive VWs I've had, the RF wheel gets the torque. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] transmission rebuilding bad vibrations BS wiki and the US Merc
Don't worry had me confused as well, I knew I should have not skipped the class on differential operations but all good now. Those nice diagrams on wikipedia explain it nicely. I guess the spider gears have a 2:1 ratio. Speaking of things I did not know cause I wasn't paying attention, did you know that the Chrysler 300 came with a Diesel engine in England and Oz? However don't get too excited, the OM642 had some serious issues http://en.wikipedia.org/wiki/Mercedes-Benz_OM642_engine a fella over here had his fail at 70k kmhs. Which leads me onto one of my pet hates, the geniuses who write crap on wikipedia: The*Mercedes-Benz OM642 engine*is a 3.0-liter, 72° 24-valve, aluminum block dieselV6 engine http://en.wikipedia.org/wiki/V6_enginemanufactured by theMercedes-Benz http://en.wikipedia.org/wiki/Mercedes-Benzdivision ofDaimler AG http://en.wikipedia.org/wiki/Daimler_AG Mercedes-Benz division? I didn't know that Daimler had a MB division, I am thinking MB is a brand name for Daimler, cooked up when Daimler and Benz had to jump into bed together. Anyway wikipedia articles relating to Daimler and it's stuff is full of this sort of thing, I might have to do some editing there. Also the claim that the G-wagen is Daimlers longest produced vehicle is rubbish, far as I know the Unimog holds that title. Hendrik who is dazed and confused but thanks to the smart people here is slowly getting better On 04/03/14 00:04, Curt Raymond wrote: I get it now and retract my previous question. I had thought the original post said that the speedo would have to read 160 to hit 80mph rotational speed. I re-read and realize it says no such thing. -Curt Date: Sun, 2 Mar 2014 21:39:37 -0700 From: Craig diese...@pisquared.net To: Mercedes Discussion List mercedes@okiebenz.com Subject: Re: [MBZ] transmission rebuilding bad vibrations BS Message-ID: 20140302213937.91f011096ef5b38a29978...@pisquared.net Content-Type: text/plain; charset=US-ASCII On Mon, 03 Mar 2014 14:36:50 +1030 Hendrik and Fay heni...@gmail.com wrote: This is all very confusing but I need to know the science behind it, otherwise I'll have to believe in magic, as that is the only explanation I can think of as to why a tire would spin at twice the normal speed. With an ordinary, non-limited slip, non-Torsen differential, if both rear wheels are turning at the same rate, as in driving down a straight, dry road, they will go the speed indicated by the speedometer. If one wheel is held still and the other is allowed to rotate freely, like with the car on jack stands or with one wheel on ice and one wheel on dry pavement, the wheel that is rotating will rotate with twice the speed indicated by the speedometer. That's how an ordinary differential works. Craig ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] transmission rebuilding bad vibrations BS
OK I'll bite, you're saying that if you put the rear axle up, the rear wheel will spin at twice the speed? How does that work? The magic 2 speed diff option? The input speed into the diff is the same at 80 but the output doubles? That's great, I am going to take one of the tires of the back and get better mileage, just explain how this works, dumb old me always thought these things are to do with gear ratios but hey if I can twice the speed out of it, due to the magic diff, I’ll give it a crack. What about if I spin the tire in dirt and only side is spinning, am I going twice as fast or have I broken the speed of light and time is slowing down? This is all very confusing but I need to know the science behind it, otherwise I'll have to believe in magic, as that is the only explanation I can think of as to why a tire would spin at twice the normal speed. Hendrik who is confused On 03/03/14 13:57, Dieselhead wrote: Max Dillon wrote: 80 would be very unsafe; if only one wheel was turning, it would be going 160 mph when your speedometer read 80, which might cause that tire to come apart... ...or the differential. Mitch. No, the tire speed rating has to do with heat. THe tire does not heat up spinning in air. The right rear tire won't come apart, but you don't want the speedo going 80 on stands for long. Just long enough to see the driveshaft oscillating, or not. That does not cause the tire to come apart, or the diff to fail as long as it has the proper level of the right grease in it. I've done it to diagnose driveshaft problems. It only takes a second at the harmonious speed. Then you see the driveshaft oscillating. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] transmission rebuilding bad vibrations BS
On Mon, 03 Mar 2014 14:36:50 +1030 Hendrik and Fay heni...@gmail.com wrote: This is all very confusing but I need to know the science behind it, otherwise I'll have to believe in magic, as that is the only explanation I can think of as to why a tire would spin at twice the normal speed. With an ordinary, non-limited slip, non-Torsen differential, if both rear wheels are turning at the same rate, as in driving down a straight, dry road, they will go the speed indicated by the speedometer. If one wheel is held still and the other is allowed to rotate freely, like with the car on jack stands or with one wheel on ice and one wheel on dry pavement, the wheel that is rotating will rotate with twice the speed indicated by the speedometer. That's how an ordinary differential works. Craig ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] transmission rebuilding bad vibrations BS
On Mon, 03 Mar 2014 14:36:50 +1030 Hendrik and Fay heni...@gmail.com wrote: This is all very confusing but I need to know the science behind it, otherwise I'll have to believe in magic, as that is the only explanation I can think of as to why a tire would spin at twice the normal speed. With an ordinary, non-limited slip, non-Torsen differential, if both rear wheels are turning at the same rate, as in driving down a straight, dry road, they will go the speed indicated by the speedometer. If one wheel is held still and the other is allowed to rotate freely, like with the car on jack stands or with one wheel on ice and one wheel on dry pavement, the wheel that is rotating will rotate with twice the speed indicated by the speedometer. That's how an ordinary differential works. Craig Right, and the physics of how a differential is normally built, and the usual engine rotation direction cause the right rear (driven) wheel to turn/slip more if all things are equal. On the front drive VWs I've had, the RF wheel gets the torque. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
