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4 wheel drive questions
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<blockquote data-quote="Dega Moo" data-source="post: 1154327" data-attributes="member: 19930"><p>My understanding: When turning or travelling around a curve the front left and front right wheels each travel, or roll, a different distance. With the vehicle locked into 4WD and these wheels being 'driven', the tires push or scuff across the tread of the tire trying to travel different distances while the tires 'roll' about the same distance. The rear tires get much less of that kind of action in any case because the wheels remain 'straight' and upright so scuffing tends to mostly be with the tire tread and not across the tread. Also, because the front end supports the engine there is generally more pressure on the front tires causing greater scuffing action there. Typically, in a curve brakes are applied or the vehicle decelerates forcing the front end down and weight into the front outside tire while taking weight off the rear tires, especially the inside rear. That's why the back end of a vehicle will tend to break out and slide to the outside of a curve around the outside front tire more often than the front end sliding in any conditions.</p><p></p><p>When using 4WD on slippery surfaces such as snow, ice and rain, that scuffing action is less abrasive to the tires and puts far less pressure on mechanical gears and wheels driving the front end. You can really feel it when trying to make a short turn at low speed on dry pavement in 4WD and then do the same on slick pavement or mud. Full time 4WD systems usually kick into 4WD when wheel slippage is recognized.</p><p></p><p>If you're travelling on a straight dry road you should be able to run in 4WD without issue because you're not pushing the tires sideways. A couple of decades ago it made sense to run 4WD on straight road once a month or so to ensure lube got into the lockouts and gearing.</p></blockquote><p></p>
[QUOTE="Dega Moo, post: 1154327, member: 19930"] My understanding: When turning or travelling around a curve the front left and front right wheels each travel, or roll, a different distance. With the vehicle locked into 4WD and these wheels being 'driven', the tires push or scuff across the tread of the tire trying to travel different distances while the tires 'roll' about the same distance. The rear tires get much less of that kind of action in any case because the wheels remain 'straight' and upright so scuffing tends to mostly be with the tire tread and not across the tread. Also, because the front end supports the engine there is generally more pressure on the front tires causing greater scuffing action there. Typically, in a curve brakes are applied or the vehicle decelerates forcing the front end down and weight into the front outside tire while taking weight off the rear tires, especially the inside rear. That's why the back end of a vehicle will tend to break out and slide to the outside of a curve around the outside front tire more often than the front end sliding in any conditions. When using 4WD on slippery surfaces such as snow, ice and rain, that scuffing action is less abrasive to the tires and puts far less pressure on mechanical gears and wheels driving the front end. You can really feel it when trying to make a short turn at low speed on dry pavement in 4WD and then do the same on slick pavement or mud. Full time 4WD systems usually kick into 4WD when wheel slippage is recognized. If you're travelling on a straight dry road you should be able to run in 4WD without issue because you're not pushing the tires sideways. A couple of decades ago it made sense to run 4WD on straight road once a month or so to ensure lube got into the lockouts and gearing. [/QUOTE]
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