can-am800 vs sportsman800
Oct 10, 2006 | 01:16 PM
#162
Pro Rider
Joined: Oct 2004
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can-am800 vs sportsman800
Continuing on with my discussion about the 4WD system on the Polaris versus the 4WD system on the BRP, I thought it best to give a brief explaination of the Polaris system. It seems that most everyone is familiar with the BRP system. Here is a post I recently made on the Polaris forum.
I am curious to hear feedback from others about the two systems.
The Hilliard clutch is an over running clutch. It differs from a normal over running clutch in that it can engage in either direction. This allows the Polaris to have 4 wheel drive in both forward and reverse.
Like any over running clutch, it will only engage when the input speed attempts to exceed the output speed. The way we use this feature is we connect the input of the over running clutch to the front wheel half shafts and connect the output of the over running clutch to the wheel. Then we can cause the over running clutch to engage by causing the front half shaft speed to attempt to run faster than the front wheels. This is exacly what happens when the rear wheels start slipping. So the over running clutch engages when the rear wheels start slipping.
In reality the rear wheels are always slightly slipping. However, we do not want the Hilliards to be always engaged. So the way we solve this problem is by running the front differential at a slightly lower gear ratio than the rear diff. This causes the inputs of the over running clutch to run slightly slower than the front tires. The ratio difference is about 20%. Now when the rear wheels slip at 20%, the Hilliards engage and power is transfered to the front tires.
Now a normal over running cluch only engages in one direction. However, we need a bi-directional over running clutch for our Polaris. The way we make this happen is to allow the over running rollers to be held in a "cage" and we apply drag to this cage. When we apply drag to this cage AND the input speed attempts to exceed the output speed, the rollers will jam themselves between the ramps in the over running clutch and the smooth surface of the insde of the wheel hubs. Understanding this drag is key to understanding how the Polaris system works.
The way we create this drag is to send current through an electro-magnet. This magnet attacts a plate that connects to the "cage". It is this electro-magnetic attraction that causes the drag.
Like any over running clutch, it will only engage when the input speed attempts to exceed the output speed. The way we use this feature is we connect the input of the over running clutch to the front wheel half shafts and connect the output of the over running clutch to the wheel. Then we can cause the over running clutch to engage by causing the front half shaft speed to attempt to run faster than the front wheels. This is exacly what happens when the rear wheels start slipping. So the over running clutch engages when the rear wheels start slipping.
In reality the rear wheels are always slightly slipping. However, we do not want the Hilliards to be always engaged. So the way we solve this problem is by running the front differential at a slightly lower gear ratio than the rear diff. This causes the inputs of the over running clutch to run slightly slower than the front tires. The ratio difference is about 20%. Now when the rear wheels slip at 20%, the Hilliards engage and power is transfered to the front tires.
Now a normal over running cluch only engages in one direction. However, we need a bi-directional over running clutch for our Polaris. The way we make this happen is to allow the over running rollers to be held in a "cage" and we apply drag to this cage. When we apply drag to this cage AND the input speed attempts to exceed the output speed, the rollers will jam themselves between the ramps in the over running clutch and the smooth surface of the insde of the wheel hubs. Understanding this drag is key to understanding how the Polaris system works.
The way we create this drag is to send current through an electro-magnet. This magnet attacts a plate that connects to the "cage". It is this electro-magnetic attraction that causes the drag.
Oct 10, 2006 | 02:02 PM
#163
Pro Rider
You can take all the "shootouts" and put them in one bucket and you won't have beans.
You can take all the "shootouts" and put them in one bucket and you won't have beans.
Joined: Feb 2004
Posts: 473
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can-am800 vs sportsman800
Nice quote on how the Polaris system works. It explains a lot to me about how my old Polaris would act in 4wd. To have a 20% difference between the front and rear axle ratios of a 4wd machine is simply inviting instability and quirky handling. Thanks for the heads up.
And by the way Brvce GTX, my granddaughter lovers her Trailblazer, except it does'nt have enough power in the dunes.
And by the way Brvce GTX, my granddaughter lovers her Trailblazer, except it does'nt have enough power in the dunes.
Oct 10, 2006 | 03:36 PM
#165
Thread Starter
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Weekend Warrior
Joined: Sep 2006
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can-am800 vs sportsman800
Hello, I am the original writer of this thread. All I have to say is I made my decision and bought a 800XT CAN-AM Three weeks ago after riding both of the vehicles many times in different situations. In my opinion it would have been buying a 1970's model Harley compared to a 2006 Model if I would have bought the SP. The ride and handling of the Outy just blows the 800SP away. The 800 SP reminds me of my mothers 1972 LTD.
Thanks for all the 4X4 Jibber Jabber but the Outy makes you feel like your in the **** pit and in control and not sitting on top of a tank rolling throught the Mountains.
800 XT Yellow
Everyone Take a Chill Pill and Drink a Beer
RMANSTER
Thanks for all the 4X4 Jibber Jabber but the Outy makes you feel like your in the **** pit and in control and not sitting on top of a tank rolling throught the Mountains.
800 XT Yellow
Everyone Take a Chill Pill and Drink a Beer
RMANSTER
Oct 10, 2006 | 06:27 PM
#168
Extreme Pro Rider
Joined: Jan 2006
Posts: 3,752
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can-am800 vs sportsman800
Originally posted by: revilo
Arctic cats suck... gee your right V2 that was kinda fun.
Arctic cats suck... gee your right V2 that was kinda fun.
And so does whatever you ride, now dont you feel better?[img]i/expressions/face-icon-small-wink.gif[/img]
Oct 10, 2006 | 06:28 PM
#169
Pro Rider
Joined: Jan 2004
Posts: 1,149
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can-am800 vs sportsman800
Originally posted by: rmanster
Hello, I am the original writer of this thread. All I have to say is I made my decision and bought a 800XT CAN-AM Three weeks ago after riding both of the vehicles many times in different situations. In my opinion it would have been buying a 1970's model Harley compared to a 2006 Model if I would have bought the SP. The ride and handling of the Outy just blows the 800SP away. The 800 SP reminds me of my mothers 1972 LTD.
Thanks for all the 4X4 Jibber Jabber but the Outy makes you feel like your in the **** pit and in control and not sitting on top of a tank rolling throught the Mountains.
800 XT Yellow
Everyone Take a Chill Pill and Drink a Beer
RMANSTER
Hello, I am the original writer of this thread. All I have to say is I made my decision and bought a 800XT CAN-AM Three weeks ago after riding both of the vehicles many times in different situations. In my opinion it would have been buying a 1970's model Harley compared to a 2006 Model if I would have bought the SP. The ride and handling of the Outy just blows the 800SP away. The 800 SP reminds me of my mothers 1972 LTD.
Thanks for all the 4X4 Jibber Jabber but the Outy makes you feel like your in the **** pit and in control and not sitting on top of a tank rolling throught the Mountains.
800 XT Yellow
Everyone Take a Chill Pill and Drink a Beer
RMANSTER
Congrats on your new Outy. Some guys think it's a good idea to change the gear box and rear diff oil right after your breakin.
The skids are a little irritating because of how much you have already put out, but to be safe you will need them. Raidermike made a template and his own skids, didn't cost very much, I'm sure he would be glad to share his experience with you.