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| Thread ID: 121019 | 2011-10-08 00:31:00 | Mazda 626 Front Wheel not Spinning | kahawai chaser (3545) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1236343 | 2011-10-08 01:24:00 | Agree with kenj. It's just a tad more resistance to one wheel, most probably being the brakes. No big deal. The same thing happens on my car. | Paul.Cov (425) | ||
| 1236344 | 2011-10-08 01:31:00 | From memory, if you turn one wheel clockwise, the wheel on the other side will turn anti-clockwise. It's just the way the diff works. Ask prefect or SJ. | Richard (739) | ||
| 1236345 | 2011-10-08 01:50:00 | From memory, if you turn one wheel clockwise, the wheel on the other side will turn anti-clockwise. It's just the way the diff works. Ask prefect or SJ. Seems good test - never thought of checking the spinning L/H wheel when turning, or even rotating backwards, the RH stationery wheel. Since had long forgotten about diffs or how they specifically operate from wheel to wheel. The video from Alex B explains well diff operation, but never occurred that diff are present for front wheel drives. Certainly well known and obvious for rear wheel drives. But because the drive shafts go directing in the transmission through inner CV joints, might mean a diff type mechanism is built in the transmission? Not sure if brakes are just touching, but do release when wheel spun by hand, yet the wheel eventually completely stops (when straight - but spins when turned L-R) in Auto Drive, with car raised. |
kahawai chaser (3545) | ||
| 1236346 | 2011-10-08 04:09:00 | Yes it's built into the trans. | Alex B (15479) | ||
| 1236347 | 2011-10-08 06:23:00 | From memory, if you turn one wheel clockwise, the wheel on the other side will turn anti-clockwise . It's just the way the diff works . Ask prefect or SJ . Yes it's built into the trans . There is a tendency to spin just one side of any differential system, irrespective of brakes and drag unless there's quite a lot of that going on . There could also be a specter of another remotely possible problem here too . You have the vehicle off the ground and the wheels are for all intents and policies, hanging in a zone in which they do not usually operate . Since one jack shaft is somewhat shorter than the other, the included angles of the CV and plunger joints is unequal and this can impart less or more resistance to rotating about their epicenters too, causing one wheel to turn as the other is slightly bound up from a more radical angle of the joints . Moot, really, as you are not seeing it operate in a more normal mode - but an interesting observation by you nonetheless . In operation, the differential has little to no consideration for anything but squirting the power out to the wheel with the least resistance, so here one is turning . UNLESS - and here's where the best of observations come into play --- ONE wheel abruptly stops and the other takes up the whole operation of the =side gears and spiders in the differential part of the hypoid drive system . This is NOT really a process of the transmission per se, but of the differential . Although they both are encased in the same transmission case, they are separate entities with totally different jobs to perform . |
SurferJoe46 (51) | ||
| 1236348 | 2011-10-08 08:03:00 | All things being equal, the shorter shaft will tend to stop before the long one because of the greater angle on the joints. When the shafts are in their operating position ie: horizontal they will be the same. | mzee (3324) | ||
| 1236349 | 2011-10-08 09:38:00 | SJ/Mzee: Makes sense of any extreme angles present for cv joints and inner plunger (tripod spider joint if I recall), preventing the longer RH axle from turning when straight, if not the diff having any effect. Also the intermediate support bearing might start to spin the axle only when steering L to R when car is raised/unloaded from upward force. I suppose the bearing in part, minimizes angular cv movement, on the longer shaft. One way to test, maybe if a left hand drive displays the opposite spin effect, i.e. the RH wheel spins. | kahawai chaser (3545) | ||
| 1236350 | 2011-10-08 17:26:00 | SJ/Mzee: Makes sense of any extreme angles present for cv joints and inner plunger (tripod spider joint if I recall), preventing the longer RH axle from turning when straight, if not the diff having any effect. Also the intermediate support bearing might start to spin the axle only when steering L to R when car is raised/unloaded from upward force. I suppose the bearing in part, minimizes angular cv movement, on the longer shaft. One way to test, maybe if a left hand drive displays the opposite spin effect, i.e. the RH wheel spins. The sole reason for the support bearing is to take self-steering torque out of the wheels during hard acceleration. Without it there, the steering wheel will try to pull out of your hands when you hit the throttle and steer the car to the shorter stub-axle side. A very dangerous situation if you have a turbo and it's cranking some pressure into the engine. Been there - done it with a stuck closed waste gate on a bi-turbo'd Mazda once that instantly went into the third lane to my right on the San Diego Freeway at rush hour. |
SurferJoe46 (51) | ||
| 1236351 | 2011-10-08 22:48:00 | The . . . engine . Been there - done it with a stuck closed waste gate on a bi-turbo'd Mazda once that instantly went into the third lane to my right on the San Diego Freeway at rush hour . Oh, so that's what does it . I had a vague idea it was something to do with a curry diet . ;) |
R2x1 (4628) | ||
| 1236352 | 2011-10-08 23:42:00 | No - nor Vegemite either. Now - Kool-Aid, OTOH is a great lane-changer. |
SurferJoe46 (51) | ||
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