Dumb wheel direction question
in [Technical]
|
Prev: Toyota Provided No Evidence of Testing Electronic Throttle to US Congress
Next: Motor racing legend Stirling Moss in intensive care after falling
From: Sara Brown on 7 Mar 2010 17:54 This may sound silly but on a 1994 Dodge Caravan with the 3.0 engine and the automatic transmission are the drivers and passangers tires suppose to turn opposite directions when the vehicle is in Park? For example if the front of the vehicle was up on jack-stands and it was in Park and you turned the drivers wheel forwards is it normal that the passengers wheel would be turning backwards?
From: cuhulin on 7 Mar 2010 18:06 Front wheel drive or rear wheel drive,, it is normal for one of the wheels to turn/rotate in opposite direction from the opposite wheel.It is suppose to, that is because of the gears in the differential. cuhulin
From: Tegger on 7 Mar 2010 18:41 Sara Brown <SaraTGinMD(a)aol.com> wrote in news:cf8d5239-b062-464f-96cf- 57ba0489263b(a)a18g2000yqc.googlegroups.com: > This may sound silly but on a 1994 Dodge Caravan with the 3.0 engine > and the automatic transmission are the drivers and passangers tires > suppose to turn opposite directions when the vehicle is in Park? For > example if the front of the vehicle was up on jack-stands and it was > in Park and you turned the drivers wheel forwards is it normal that > the passengers wheel would be turning backwards? Yep; perfectly normal. If your vehicle has an "open" differential and both driven wheels are off the ground, then they will turn in different directions when one is spun by hand. However, if your vehicle has a "limited slip" differential, both wheels will turn the SAME direction when one is spun by hand. <http://www.youtube.com/watch?v=K4JhruinbWc> This is long, and at first seems off-topic, but watch it ALL the way through. More... <http://www.howstuffworks.com/differential.htm> -- Tegger
From: m6onz5a on 8 Mar 2010 04:27 On Mar 7, 5:54 pm, Sara Brown <SaraTGi...(a)aol.com> wrote: > This may sound silly but on a 1994 Dodge Caravan with the 3.0 engine > and the automatic transmission are the drivers and passangers tires > suppose to turn opposite directions when the vehicle is in Park? For > example if the front of the vehicle was up on jack-stands and it was > in Park and you turned the drivers wheel forwards is it normal that > the passengers wheel would be turning backwards? Yes perfectly normal... I also recall somewhere some cars wheels will move in the same direction when turned. This signifies if the vehicle has a limited slip differential or not as well.
From: Steve on 8 Mar 2010 10:20
Sara Brown wrote: > This may sound silly but on a 1994 Dodge Caravan with the 3.0 engine > and the automatic transmission are the drivers and passangers tires > suppose to turn opposite directions when the vehicle is in Park? For > example if the front of the vehicle was up on jack-stands and it was > in Park and you turned the drivers wheel forwards is it normal that > the passengers wheel would be turning backwards? Yes, that is the result of the differential gears that allow the two wheels to turn at different rates when going around a corner. The sum of the rotational speeds of the two wheels has to equal the input shaft speed (times a constant which is the gear ratio of the differential itself). When on jackstands, the input shaft speed is zero so if you rotate one wheel forward at 2 rpm, the other wheel has to rotate at "-2" rpm to sum to zero. |