Limited slip and locking differentials
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| − | |[[File:Open diff.jpg|thumb | + | |[[File:Open diff.jpg|thumb|300px|center|Open differential]] |
| − | |[[File:Auburn limited slip differential.jpg|thumb | + | |[[File:Auburn limited slip differential.jpg|thumb|300px|center|Auburn limited slip differential]] |
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| − | |[[File:Cutaway lsd clutchtype.jpg|thumb | + | |[[File:Cutaway lsd clutchtype.jpg|thumb|300px|center|Cutaway of a clutch-type LSD]] |
| − | |[[File:Limited slip diff cone.jpg|thumb | + | |[[File:Limited slip diff cone.jpg|thumb|350px|center|Cutaway of a [http://en.wikipedia.org/wiki/Limited-slip_differential cone-type] LSD]] |
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==="Lunchbox" locker=== | ==="Lunchbox" locker=== | ||
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The lunchbox locker, or "drop-in" locker is a type of automatic locker that replaces the side (axle) gears and spider (pinion) gears (in some/most types) of a diff. The pinion gears referred to here are NOT the same as the pinion gear that meshes with the ring gear. Instead, they're the smaller gears in the center of the diff that allows the two wheels to rotate at different speeds when turning, etc. | The lunchbox locker, or "drop-in" locker is a type of automatic locker that replaces the side (axle) gears and spider (pinion) gears (in some/most types) of a diff. The pinion gears referred to here are NOT the same as the pinion gear that meshes with the ring gear. Instead, they're the smaller gears in the center of the diff that allows the two wheels to rotate at different speeds when turning, etc. | ||
A lunchbox locker is relatively easy to install, mainly because the original backlash and preload settings are not disturbed during the installation. The lunchbox locker will only be as strong as the original carrier and rearend housing it's installed in, so using one in a weak design will ''still'' be a weak design. One thing that makes it better than some of the less expensive alternatives to a proper LSD is the lunchbox does act as a differential. Not particularly well, though, and because of its idiosyncrasies its generally not recommended for street use because of things like how it can lock while cornering, depending on how the power is applied. | A lunchbox locker is relatively easy to install, mainly because the original backlash and preload settings are not disturbed during the installation. The lunchbox locker will only be as strong as the original carrier and rearend housing it's installed in, so using one in a weak design will ''still'' be a weak design. One thing that makes it better than some of the less expensive alternatives to a proper LSD is the lunchbox does act as a differential. Not particularly well, though, and because of its idiosyncrasies its generally not recommended for street use because of things like how it can lock while cornering, depending on how the power is applied. | ||
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| + | [[File:Auto locker.jpg|thumb|160px|left|Lunchbox locker]] <br style="clear:both"/> | ||
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===Spools=== | ===Spools=== | ||
A spool is not a differential, and isn't considered to be limited slip, either. A spool connects both wheels the same as if there were a live axle (think of a go kart from the '60s). In the case of a spool or mini spool (or welded spider gears), both wheels are turning the same speed all the time- even when going around a corner or doing parking lot maneuvers. This causes the inside wheel to rotate faster than it needs to when cornering or maneuvering. The result is reduced tread life, squealing of the tires even at slow speeds when turning, and a lot of stress on the rear end components. Not to mention a potential loss of control in low-traction conditions like ice, snow or rain. | A spool is not a differential, and isn't considered to be limited slip, either. A spool connects both wheels the same as if there were a live axle (think of a go kart from the '60s). In the case of a spool or mini spool (or welded spider gears), both wheels are turning the same speed all the time- even when going around a corner or doing parking lot maneuvers. This causes the inside wheel to rotate faster than it needs to when cornering or maneuvering. The result is reduced tread life, squealing of the tires even at slow speeds when turning, and a lot of stress on the rear end components. Not to mention a potential loss of control in low-traction conditions like ice, snow or rain. | ||
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===Welded spider gears=== | ===Welded spider gears=== | ||
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A welded diff has the dubious distinction of not only having all the drawbacks of a spool on the street, but also adds the danger of loss of control should the welds break and jam between the ring gear and pinion- which will lock the rear wheels. Not what you want to happen at ANY speed, let alone at the top end of a run, or while carving the canyons. | A welded diff has the dubious distinction of not only having all the drawbacks of a spool on the street, but also adds the danger of loss of control should the welds break and jam between the ring gear and pinion- which will lock the rear wheels. Not what you want to happen at ANY speed, let alone at the top end of a run, or while carving the canyons. | ||
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| − | {{warning|The | + | [[File:Welded spiders.jpg|thumb|250px|left|This abomination is what an open diff with welded spider gears looks like]]<br style="clear:both"/> |
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| + | {{warning|The reason the spools and welded diff are shown here is so they can be identified if they're found inside a rearend. It should be stressed that the street is no place for a spool or welded spiders. Period. It matters very little to anyone who finds themselves upside down in a ditch that someone ''else'' claimed they drove on the street for 20 years with either one of these (or a mini spool) without any problems. What '''should''' matter is that using either one on the street is a very unsafe practice that should be avoided altogether. A spool is a racing modification only. A welded diff is not safe on the street OR track. Just don't do it.}} | ||
==Resources== | ==Resources== | ||
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