green72
Well-Known Member
What does the term " spool" mean when talking about a rear end?
Need a quick explanation
- Thread starter green72
- Start date
-
1968FormulaS340
Well-Known Member
Think of a spool of thread. If you pull the thread the entire spool turns. Both ends of the spool are turning equally to each other.
With a spool, you give up the differential action that is very desirable for the street. Spools are fine for going straight and provide 100% torque to both wheels, but while turning, where one wheel is is traveling a different distance and speed, problems can occur (Premature component failure and/or loss of control).
If you run a spool on the street, you will want stronger, after-market axles. You will also need to be aware, and make others aware, that may drive your car, that it has a spool and may not drive as they expect.
With a spool, you give up the differential action that is very desirable for the street. Spools are fine for going straight and provide 100% torque to both wheels, but while turning, where one wheel is is traveling a different distance and speed, problems can occur (Premature component failure and/or loss of control).
If you run a spool on the street, you will want stronger, after-market axles. You will also need to be aware, and make others aware, that may drive your car, that it has a spool and may not drive as they expect.
Inertia
Well-Known Member
A spool is a device that connects the two axles directly to the ring gear. There is no differentiation side to side, so a vehicle equipped with a spool will bark tires in turns and may become unmanageable in wet or snowy weather. Spools are usually reserved for competition vehicles not driven on the street.[4]
Mini-spool uses the stock carrier and replaces only the internal components of the differential, similar in installation to the lunchbox locker. A full spool replaces the entire carrier assembly with a single machined piece. A full spool is perhaps the strongest means of locking an axle, but has no ability to differentiate wheel speeds whatsoever, putting high stress on all affected driveline components.
The internal spider gears of an open differential can also be welded together to create a locked axle; this method is not recommended as the welding process seriously compromises the metallurgical composition of the welded components, and can lead to failure of the unit under stress. If it is desirable to have a spooled axle, the better option is to install either a mini-spool or a full spool
http://en.wikipedia.org/wiki/Locking_differential#Spool
Mini-spool uses the stock carrier and replaces only the internal components of the differential, similar in installation to the lunchbox locker. A full spool replaces the entire carrier assembly with a single machined piece. A full spool is perhaps the strongest means of locking an axle, but has no ability to differentiate wheel speeds whatsoever, putting high stress on all affected driveline components.
The internal spider gears of an open differential can also be welded together to create a locked axle; this method is not recommended as the welding process seriously compromises the metallurgical composition of the welded components, and can lead to failure of the unit under stress. If it is desirable to have a spooled axle, the better option is to install either a mini-spool or a full spool
http://en.wikipedia.org/wiki/Locking_differential#Spool
A spool is a part that replaces the posi unit. It has no moving parts and locks both axles together so the both spin at the same time.
Most drag cars use them because they're lighter and there's less chance of breakage.
Ted
Most drag cars use them because they're lighter and there's less chance of breakage.
Ted
Both axles locked together. Quick enough?
Nice highjack.
green72
Well-Known Member
Thanks for the info All clear now!!!
-
