The thrust line effectively divides left and right rear wheel toe. Send them to [email protected]. 0. Tightened Lug nuts to specification. Otherwise, write “cancel” on the invoice, return it and owe nothing. 4) Inexpensive enough that each of the clubs can afford to acquire one and make it available ... the factory specs … Research 2012 Ford Super Duty F-53 Motorhome specs for the trims available. Should this coach have a front-end alignment because of the new tires and to help protect my investment? Camber spec is 0.5 +/- 0.5 degrees. How often should this type of motorhome have an alignment? If you like MotorHome, pay just $19.97 for 11 more issues (12 in all). Toe angle compares the distance between the center of the front of the tires to a distance between the centers of the rear of the tires on the same axle. Caster is a stability angle, measured in degrees. RV Tech Library - A part of the Tiffin RV Network. © 2021 Hearst Business Publishing, Inc. | If the suspension has been modified with the use of stiffer, less compliant bushings, the amount of toe change under acceleration likely won’t change as much, so you may be able to set front toe closer to zero, or a bit toward the preferred side, depending on driver requirements. There's an art to engineering a motorhome, as elegantly demonstrated in the custom-built PowerGlide chassis. While static toe (with wheels aimed straight ahead) allows both front wheels to rotate at the same speed and parallel to each other, during a turn the individual wheel toe angles differ when the steering wheel is turned more than 20°. In this way, you enhance handling without wandering beyond the vehicle maker’s specs. The thrust angle refers to difference between the geometric centerline and the thrust line, measured in degrees. John Arch l Via email. Alignment Specifications and Procedures W6000345 (Effective from September 2000) Over the past two years, representatives from Volvo Trucks North America actively par-ticipated, along with twenty-two companies, in developing Recommended Practice 642 entitled “Total Vehicle Alignment: Recommendations for Maximizing Tire and Alignment For a performance setting, you need to consider how the vehicle is to be driven (re the driver’s expectations) to achieve an acceptable balance between cornering traction and tire tread wear. If the thrust angle aims left (driver’s side), this is a negative thrust angle. Unfortunately, I’ve seen all too many realigned front ends cause worse tire wear because of shoddy workmanship. Dialing in more negative camber serves to compensate, placing the load more evenly across the tire’s tread area. Front caster angle may or may not be readily adjustable, again, depending on suspension design. Search for new and used Class A Motorhomes for sale. If the front suspension features MacPherson struts, the upper strut mount serves as the upper locating point, which is usually a fixed point on most production vehicles. New Gear November 2, 2020. "Warning! 24,000 26,000 Front end alignment isn't something that most RV'ers will want to do and will opt to having a pro do the job. This design feature reduces the tendency of tire scrub during turns and reduces the turning radius of the outboard wheel, reducing the car’s tendency to turn-in too quickly, while providing reduced recovery effort when the vehicle direction changes. There is no caster setting for the rear of a vehicle. Imagine a worn suspension that allows a front wheel and tire to swing between the recommended 1⁄16 in. Usually you want the left side to be a little more positive than the right to compensate for road crown. So whaddaya do if you want a “performance” alignment? Using a true vertical drawn through the hub center as a reference, caster angle is represented by a straight line drawn through the upper ball joint/pivot location through the lower ball joint. When using modern radial tires on the rear wheel drive ’50/’60/’70’s Mopars, front wheel alignment can/should/needs to be adjusted for more and better steering response and overal safer handling of the car. If the front suspension is strut-equipped, camber may be adjustable (via an aftermarket kit) by adjusting the top of the strut mount inboard/outboard at the upper towers or, again, depending on design, by adjusting an eccentric at the lower mount at the strut-to-steering arm connection. Aftermarket upgrades—such as moving to wider tires, different wheel offset, shorter sidewall due to plus-sizing— are common. Upgrade To a Residential Fridge in Your RV, Play it Safe: Outdoor Recreation During COVID. Most gearheads understand the basic definitions of caster, camber, and toe, but when it comes to actually measuring or setting these wheel-alignment specs… Get a FREE issue of MotorHome magazine. Front Suspension and Alignment. You’re not the average driver! The alignment of the wheels, set by the chassis manufacturer before leaving the factory, should be checked at 1,500km (900 miles) without fail. Call 1-800-727-7000. If the wheel leans inward at the top, this is negative camber. How often should this type of motorhome have an alignment? Privacy policy | Choose the desired trim / style from the dropdown list to see the corresponding specs. Usually the amount of offset change is kept to a minimum, and vehicle tracking remains relatively unchanged. However, if the offset is significantly different, it will alter the way the road forces are transmitted through the tire and wheel to the suspension. This added toe-out will also contribute to tramlining because it will reduce vehicle straight-line stability. All front suspensions, regardless of design, feature toe angle adjustment, at a location on the steering tie rods/tie rod ends. As you increase negative camber, the inside tread area will tend to wear faster than the rest of the tread when the vehicle is driven in a straight line; but if the driver is aggressive in turns, insufficient negative camber will allow the tire to “roll” excessively, reducing the tire contact patch. Scrub radius represents the point of greatest load on the tire tread area, primarily during turns. The geometric centerline refers to a line drawn from the center of the rear axle to the center of the front axle, as viewed from above. It protects the store from having customers return, saying their tires aren’t wearing well, or are ruined, etc., and it does help the store’s bottom line. Performing a precise wheel alignment assures maximum tire life, vehicle stability and control. Caster angle settings for street-driven vehicles should provide a good compromise to achieve an acceptable steering effort, confident high-speed stability and turning/cornering performance. with this motorhome version of the P Chassis and wind up treating it like a truck. I recently replaced all six tires with new Goodyear tires. You have entered an incorrect email address! This will allow you to better tune the wheel angles in a loaded condition as the car will normally be driven. In most cases, a short-arm/long-arm suspension (upper and lower control arms where the lower arm is longer) will exhibit a positive scrub radius. Explore the greatest in RVs, travel, gear and more. When the lines cross above the road surface, this condition is known as negative scrub. J The SAI is determined at the point in which these two lines intersect. A zero-toe angle exists if the distance between the front of the wheels (ahead of axle centerline) is identical to the distance between the wheels behind the axle centerline. The toe angle is critical in terms of tire tread life. Motorhome data, features and specifications This section of the site provides a helpful guide to specifications and features for a wide range of over 820 motorhomes and RVs. 14) Once satisfied with alignment. Keep in mind that excessive negative camber (excessive for the street, that is) can result in reduced straight-line high-speed stability and make the vehicle a bit darty. If a vehicle is intended only for off-road use, deviating from stock settings will be necessary in order to maximize the tire contact patch during hard cornering and to enhance turn-in response. ... also provides the specs for their independent suspension. It should be obvious at this point that adjusting wheel alignment for the track will be detrimental for street driving, and vice versa. Ideally, the front steer wheels need to be parallel while cruising to avoid tread scrub. The thrust line may or may not follow the geometric centerline. Wheel offset has a direct bearing on tramlining as well. The vehicles actual caster angles are within specifications. Most tire stores try to sell an alignment whenever new front tires are installed as a routine practice. of toe-out when it encounters a rut in the road. Upgrading to a set of higher performance tires can also result in a more pronounced tramlining issue. This approach allows you to refer to and consider the rear, while a total four-wheel alignment allows adjusting of both front wheel angles as well as rear toe. Motorhome (TY3) Canada/United States of America, enUSA, First Printing Introduction. The cost for … If the thrust angle is off zero, this can contribute to vehicle dog-tracking (crooked body relative to direction of travel), increased tire wear and unequal left/right turning. Front End Alignment on an RV. Period. When the steer wheels are turned, individual wheel toe angle will change as compared to its straight-ahead static setting. I have no issues with abnormal or uneven wear and no steering issues. As the miles pile up, coupled with age, suspension components gradually wear and/or deteriorate. Control of the tire path decreases, making the vehicle more susceptible to following road irregularities. Camber angle refers to a wheel’s angle from top to bottom when viewed from the front or rear of the vehicle, as compared to a true vertical. The alignment procedure used by most alignment shops requires repeatedly lifting the coach ... specified tolerances without needing to lift the motorhome or tires off of the ground. Black Book. difference in the direction that the tire is pointed will result in the vehicle tramlining. Extreme positive or negative camber settings will make a vehicle more sensitive, especially when only one wheel at a time encounters a longitudinal rut and/or groove. In simple terms, SAI is the factory- designed “camber” angle of a specific wheel’s suspension system. It can be done though. To aid in maintaining chassis rigidity, aftermarket strut tower braces can be installed to tie the left and right struts together, preventing the unibody from flexing during hard turns. For example, when the steering wheel is turned to the left, the left front wheel will exhibit greater toe-out as compared to the number of degrees that the right front wheel toes in. This would involve using the manufacturer’s maximum negative camber, maximum positive caster and preferred toe settings. A car driven primarily at high speeds on straightaways will favor a more positive caster angle. The first two can easily be checked at home. Your Class A motorhome is NOT built on a “P30 Chassis”. ... Find new motorhome tests and reviews, dinghy towing info, motorhome tips, RV camping gear and RV DIY projects at MotorHome magazine. Performance Alignment Specs. A final word about inflation pressure: While tire inflation pressure must be adjusted for any competition application to obtain maximum tire contact patch, especially under severe lateral force (during turns), using higher tire pressures than recommended by the vehicle manufacturer for street driving will unnecessarily stiffen the tire and make it even more willing to cause tramlining. Information should only be used as a guide - to select a manufacture just click on the manufacturers name below.. F53 Chassis Cab/ F59 Commercial Chassis 91 esourcebook.dealerconnection.com February 2015 RE&T: 2016 Source Book F53 Super Duty Motorhome Chassis Dimensions F53 Class A Motorhome Chassis(1) Wheelbase (in.) 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Called positive scrub a toe in of about 1/16 to 3/16 should obvious! 2021 Hearst Business Publishing, Inc. | Privacy policy | MEDIA | Black Book end would be.. Aftermarket steering arms with raised spindle locations stability and turning/cornering performance this coach have a front-end alignment because of workmanship... Try to sell an alignment with abnormal or uneven wear and no steering issues one! To allow a smoother turn and reduce tire wear, pulling on steering! Steering, this may indicate a possible thrust angle poor directional control pile... Tire ’ s this intersection point that adjusting wheel alignment conditions affect tire wear, pulling on the axle. The toe angle will change as compared to its straight-ahead static setting dealer pointed out to me that it a... Tire pressure prior to performing any wheel alignment is checked at home to between... A pro do the job for their independent suspension refers to difference these! 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