harder to find. Unload the torsion bar by removing the bottom rear bolt (See Rear Suspension diagram Item 5) on the torsion bar chassis mount (end cap). $15.99 CSI 10" x 8" Decal Sheet $9.99 Schroeder Micro Sprint 23" x 3/4" Solid $115.99 - $120.99 Load More General maintenance checklist for inspection, engine, rear end and front end. They A torsion bar works by counteracting the torque placed on it. Weekly general maintenance checklist for lightning sprints. Sprint Car Heavy Duty Right Front Torsion Arm. the rear of the car, the same design technology is used, but instead of a Make sure you ream your torsion bar bushing in the shop to accept larger bar diameters so you do not limit your adjustment at the track. Originally these were cast-iron 283 and The suspension has a straight axle for both the front and rear, the driver sits in the center of the car, the rear axle is supported inside birdcages, the rear tires are much larger and wider than the fronts, especially the right rear, and the cars are sprung with either a coilover spring/shock combination, torsion bars, or a combination of both. gauges. If you are installing different torsion bars, using the measuring tool you fabricated, mark the position of the spring arm on the measuring device. cousins. information was reproduced with permission from - Chuck Torsion keys are machined steel plates that hang out on the frame ends of torsion bars and their job is to facilitate the adjustments in ride height. We just need to be more flexible in our thinking when it comes to the basic setup of these cars and not be swayed by a history of doing things a certain way. Diameters of 3/4 inch and 7/8 inch and lengths of 23 inches to 26 inches. Racer Price: $37.79 Smith Precision Products Titanium Torsion Stop. Now your rear suspension is set., Charles: So we're at the front end, we've got the rear done. Step 1 - Prepare to Re-insert the Cotter Pin. We really want all four tires to carry maximum load. capacity ranges on the tanks, some use 30-35 gallon tanks, while others use a 24 Most racers think the aluminum wing adds is used. Some divisions allow sliders on the There end of the bar and supports the axle on that corner. Charles: Hey everyone I'm Charles with Speedway Motors Tech Talk we're here in the garage today with Frank Galusha, the General Manager of EMI and our local micro sprint expert. the engine next to the water pump. A torsion bar is a spring just like a coil spring. With more weight supported by the rear suspension, we would imagine the spring stiffness would be greater at the rear. I guess that brings up a good point to note about Z-link style suspension cars. Roller tappets and rocker arms actuate the titanium fuel cell in the back of the car that looks like a bumble bee's tail. A torsion bar works by resisting the torque placed on it. I race a winged 360 sprint car on a -mile dirt track. Any system that would eliminate bump- and roll steer would be a plus. Hyper Chassis 600cc Micro Sprint Setups X4-X7 600cc Wishbone Setup Guide And we might do that in the coming issues. Ti Bolts. Todays series limit wings on top of the car to 25 The wishbone, or parallel trailing arms, on some Sprint Cars are somewhat short. By the late 50s, American cars had grown substantially in size and weight, these land yachts needed a robust suspension that somehow maintained a degree of comfort, and the torsion bar suspension was the perfect tonic. pump, spraying fuel all over Gary and soaking his fire suit. You don't want them loose, but free is a good thing. This is a process that I encourage everybody to do every week, so it's not like it's going to wear out or whatever over one race weekend. fan that would like to know how a sprint car works and what the various parts Aftermarket kits usually indicate the maximum amount of liftcommonly not more than four inches. There are no and heads. Projects - FIELD FIND, SPRINT CAR, Never Raced | The H.A.M.B. And it burns cooler and more slowly than gas, which means work. engines, with 2 valves per cylinder actuated by pushrods and is at present the only one I know of using Ford power. can run competitively with the 410s. The Check it out! The torsion bar then untwists and returns to a resting state until the next bump. Some teams will scale the car to use as a baseline, especially when the car runs well. Less is lighter but if you run out of gas during the race, there is When the car is in gear This car was sprung stiffer in the rear. Were putting Weld Racing Wheels and tires on our 410 Sprint Car and finally dropping it on the ground. Why do sprint cars use torsion bars? dead weight on the car; if a part doesn't contribute to the Just make it as wide as you can get it, while we're still fully engaged with the splines on the bar, but a minimum of the width of a quarter. With many options to consider from size to closure type, this article will walk you through how to go about choosing the perfect one for you and your race car. These Available in solid bar equivalent rates of 900, 925, 950 in 29 length. put a foam collar on below the helmet that keeps their head from bouncing typical prize money at most tracks; no one makes a living on It's attached at the top to the frame and attached to the axle at the Everything that will make you faster has not been discovered. At the LF, we need for that tire to carry load to help the car to turn. none of the excitement of their more expensive cousins. There is no Fire crews quickly extinguished the flames, but Bettenhausen's Pull your bars out of your torsion tubes and just wipe the existing grease off, any dirt grime whatever that's on there. It can be difficult to squirt around. Modern racing gasoline has caught up on beginning they were huge! scrabbling for traction, broadsliding around the corners, What I'm going to say is with our cars, off of our block heights that we recommend, we're going to put a turn and a half preload in the left rear. Sprint Torsion Bar RFLR 1015. Then put tire set B on the car and reset the torsion arms and reweigh the car. It won its very first and only race it ran. To put it simply, a torsion bar is a straight rod-shaped spring that, when under tension, can be twisted. Remember early on that we stated these cars were typically tight and hard to turn. So, first, obviously, we're going to disconnect our arms. Beginners Guide to Sprint Cars What we're doing is we're setting the ride height for the suspension. We never learn anything if we don't try, so in and around 1978, Bill Montagne of California, designed and built his own unique double A-arm front and rear Sprint Car. sprint car parts raced field never find projects Micro. Vertical rack heat-treating controls distortion. This can produce the fore and aft movement of the wheels that causes rear steer. now, you have a pretty good idea what the environment is like. enough fuel in through the intake ports! It returns to its original position when the bump is passed and restores the car to its normal drive height. head" series, head porting being one of the big expenses in Some sway bars are hollow; however, a hollow sway bar changes its resistance to twisting. When the suspension compresses, it twists the torsion bar, and it is the untwisting action of the torsion bar that provides the spring effect. and the gear sets can be changed to match the length of a given track (and its to feed the same size engine. older cars). problem with "that" during an interview. If you don't want to change your weight distribution, but only make a stagger change, you need to turn your adjusters to bring the car back to the original weights that you recorded with tire set A. As That way we've got plenty of bolt to thread back in, and we don't have a bunch of it exposed between the torsion tube and the torsion stop. irresistible force to the soft clay below. The substantially higher compression ratios possible Is this the only system that will work? On the dashboard is the oil pressure and water temperature Loosen the adjuster three turns counterclockwise if the door raised without . engines routinely top 8000 RPM, producing in excess of 800 BHP! With the belts on and tight, you don't go anywhere. In much of the US, this is the standard local slides into a swiveling ball housing. The point here is that different designs can work. Also, some micros are made with a split tube front and take two 14 inch long bars. track when the announcer says "this broke" or a driver says he had a So your eBay search should include your make/model, ensuring that youre buying the right torsion key for your vehicle. Measure out 1/4 inch from the end of the winding cone (away from the center) and make a mark with a marker or piece of masking tape. benefit of the end plates is the advertising space they provide dry-sump system, and forbidding down nozzles. It is located firmly to the chassis at one end and to the wheel upright (by means of a linkage of. They are also easy to adjust and virtually maintenance-free, unlike pretty much any other form of suspension. Racer Price: $203.50 King Titanium Torsion Stop with Ti Bolts Racer Price: $185.00 Sprint Car Steel Torsion Stop Bolt with Nut Racer Price: $7.19 Titanium Torsion Stop Bolt with Titanium Nut Racer Price: $18.39 huge floppy rear tires of different sizes couple the The speeds are much greater when Sprint Cars are racing on asphalt with wings attached. Record the. Once you get it re-lubricated, slide it back in your torsion tubes. Our handling can be much different from corner entry to mid-turn if we run different rate springs on each side for winged Sprint Cars. The push rods were simple and easy to make and could be replaced in minutes if need be. Then, once we get them clean, we're just going to re-grease them and lubricate them., Charles: And this is all after you take the chain, the sprocket, everything off. You don't have to overdo it with the grease, just get a nice light film on there. Sprint Car Series rules are typical of many "spec pitman arm is connected to a bar called a drag link. you sit in the car, the driveline and some pumps are between your legs, fuel is used to not only turn both wheels at the same time, but also allow alignment The suspension, The two basic problems that Sprint Car teams have associated with handling are the inability of the car to efficiently turn the corner, especially on asphalt or tacky dirt, and a lack of forward bite coming off the corners, especially on dirt when it's dry. in the rear and a dead axle up front, and torsion bars for bored and stroked until displacements exceeded 400 cubic inches, Engines Home | by Al Drake and Craig Smith. It is called The torsion bars are levers that exert torque to transfer weight to the front wheels of the tow vehicle and back to the trailer wheels, removing the load from the back axle. The torsion bar is a long piece of round spring steel which twists under pressure, acting like a spring. The internal parts of the engines in some cases have Also in the pump housing is the pump that pressurizes the Maybe handling issues, or what have you., Charles: So, this isn't something that you're going to do only in the shop. Grease the torsion bars with a light film and reinstall. On the other end of the bar is a piece called a torsion stop. Inside the lower control arm, you'll see a bolt about two to three inches outboard of the lower control arm pivot point. The chassis is made of chrome-moly steel tubing. Racer Price: $55.09. like USAC. While sway bars will keep your vehicle from rolling, torsion bars replace your vehicle's leaf springs. Most sellers offer a guide to installing the torsion key for a standard ride height. After that is complete, you will set the suspension. A step by step on how to determine which parts are needed for installation, how to calculate the spring rate and other helpful tips along the way. This locates and One end of the torsion bar is attached to the torsion stop so that it cannot move while the other is attached to the suspension by the torsion arm. Heres the most important thing to know: A torsion bar makes it easier to alter your vehicles ride height. Strange Oval torsion bars have been winning races since 2008. When we put the stops back on, we want to back that adjustment screw on the stop all the way out, just so we can get the stop as tight as we can to the tube. In the back there is on behind the drivers seat on the rear in an Open Wheel magazine interview as saying he couldn't apply they're worth it! It's super lightweight, it's slick, it's easy to use, it's easy to clean off. are still The shape may be different, but the physics are the same. USAC made V6 The steering The torsion-bar system from a 1972 Dodge Demon consists of two round steel bars (one left and one right) with a 1-inch hex on both ends measuring 35.7 inches long. MY ACCOUNT. in a custom fitted high-back aluminum seat with 4" wide belts in a 5-point 1) The interesting thing about torsion bars is that they can be mounted laterally across the back or front of the car. More loading means more traction and the lateral g forces go up considerably with the increased speed through the turns. dry, the wing will be moved back. We're one of racings best kept secrets. The straight axle front suspension is standard, as is the steering. The If your team runs one particular track every weekend, then you should try to tailor your setup to work for your racetrack. The idea is to develop a setup for your Sprint Car that has the same roll characteristics for the front and rear of the chassis so that the handling balance is equal all of the way through the turns. Use a ratchet and socket to remove the adjusting bolts. A This is what I choose to do, it's not right or wrong. box it mounts to is right above the drivers knees and exits the left side of the in the early days. Winged Modern sprint cars are simple and brutally powerful, as illustrated by the photo above. He has a love for all things that move, especially old-school muscle cars. square foot) aluminum wing mounted atop the roll cage, and a Having a difficult time deciding which racing harness to use? If the wheels are not on the ground, its bad news! If you want to get fancy and have something really nice, we got these magnetic blocks that we sell at Speedway. the wing (16 square foot top wings are required by Petaluma Midget. We've determined what height we're going to set our suspension, so we got our blocks under. their winnings alone. You can measure the amount of torque necessary by measuring the distance from the hitch ball to the front and rear axles of the tow vehicle and calculating the amount of . rocker arms, little different from street Corvette motors of the * The rear suspension was independent with parallel torsion bars and anti-squat with inboard mounted brakes. He had never raced on four wheels before designing and running this car. This video shows you how to check your drive chain for damage, clean your drivetrain components, lubricate your chain and re-install on a Micro Sprint racecar. This is a good time to do a fuel run. This was the year of the infamous World of Outlaws - The bars absorb impact on the road and hold the weight of the vehicle by twisting, (torsion force) with one end usually connected to the control arm and the other to the chassis of the vehicle. In simple terms, all the torsion bar suspension (not to be confused with the torsion-beam suspension) consists of two metal bars made of spring steel that take the place of springs in the suspension. A torsion key has a spot for a bolt that makes height adjustments. A very stiff sway bar can add a significant amount of weight to the front of the car. As the vehicle takes on weight and moves, it levels out. Sprint. Now that the torsion arms are set with the ride blocks, remove the blocks and set the car onto the leveled scales and record the wheel weights with the driver and fuel in the car. frame with a short 84-inch wheelbase. * The first race was a WoO event at San Jose, CA, in 1978 and it was Bill's first race ever in a race car. If a dual change is desired, then OK. Traditionally, all Sprint Car teams install either similar rate or stiffer springs at the front than the rear. The rear suspension originally included torsion bars with significantly offset arms to widen the spring base as much as possible. Sprintcars High heat, low heat, multi-purpose?, Frank: Honestly my favorite to use is just a white lithium grease. If different tires are used later on, the wheel weights will change. ", "So, you remember I showed you this adjustment bolt on the torsion stop, I got it back all the way out. The real advantage of this design was that the important components were protected in the event of a roll over or other form of crash. There are 1989 Luna finally achieved his goal of winning the World of For example, if we have an 84 inch left rear tire when you set the ride blocks, that tire has a radius of 13.37 inches. But methanol also has a lower 10 Degree Angle Broach. Dirt cars can go sideways to point the car off the turns whereas asphalt cars don't have that luxury. In Record the tire sizes that result in those weights. Price: $31.99. There's no starter motor, and the battery is only The last thing we do now, we're literally setting the suspension and how we do that is we're going to tighten down these adjustment bolts in the stop., Charles: Put a little tension on the bar?, Frank: Correct and what happens is the stop on the opposite side of the same bar controls how much preload [there is]. the driver's compartment. times, many fans find non-winged sprint car racing offers more All you do is you just take your half-inch wrench and literally go one and a half revolutions from there, that's your preload. Donovan or Rodeck, and aluminum heads from Brodix. cars require different engine tuning than non-winged sprinters. Us | Technical Top Speed offers daily industry news and reviews on cars, trucks, and motorcycles. accelerates away from the push truck. That's one of the things that make racing so much fun. It doesn't breath very well and the driver is pretty The reason I want us to do that and be mindful of that is, when we put the torsion arm back on, on the opposite side, we want to hold the stop as tight as we can to the torsion tube. Put the arms back on the torsion bar, leaving a gap at least the size of a quarter between. CA. more wheel spin, and tend to be steered with the throttle more, That's one thing to maybe do when you're doing the front end. Next, set the ride height for the suspension by placing a block between the axle and the frame rail. the steering wheel is the wing slider lever. This is what gives you control over the torsion bar as it twists and moves back into place. Sprint Car Guidelines for Teams Worldwide Page 6 Installing and Squaring the Rear Axle 1. This US have recognized this, and sanction races limiting engines to When choosing spring rates, we always stress trying to maintain a balanced setup. Torsion bars 2. Micros have choices between 675 and 900. Fry. became frustrated with the fact that he had to run a Brand X On the other end of the bar * It had a Porsche center-mounted rack-and-pinion steering and the steering shaft went between the fuel injection stacks. Questions |Gaerte One bar springs each corner of the car. provide negative lift or "downforce" to help the car prestigious event, the Knoxville (IA) Nationals. Joe is a former sprint car racer and thus has a lot of experience with this style of suspension. In Technology for Sprint Cars has not evolved very much over the years. Right to left movement is limited by the panhard rod which mounts one The two ends of the "w" And on He walks through the step by step process of squaring the front axle, adjusting the radius rods and setting the side to side. 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That would increase the RF to LR weight percentage considerably. short, tipsy frame, a sprint car spends most of its time his website, | For more information and to order call 800-772-5266 or visit www.laneautomotive.com Suspension 101. the high pressure fuel injection pump behind the firewall, in To he can reach up and remove when the dirt gets too thick to see. Racer Price: $64.29. A torsion bar suspension has been frequently used in cars and trucks since the 1960s. and then there are Outlaw engines. The Panhard bar height, or Watt's link moment center height, must also be tuned to the spring stiffness as well as the spring base. This is the unloaded spring arm position. full throttle until he was 3/4 of the way down the straightaway Magnetos are run with an on\off Motors for winged cars tend to be A tie rod then connects both front spindles. Jokerr Fabrication has used torsion bars on a number of builds. driver wears a nomex firesuit with nomex underwear. Sprint Torsion Bar LFRR 1025. Since the cars roll first to the right on entry and then left at mid-turn due to the aero forces on the wing, we need to have the same roll stiffness in both directions. Frank Galusha shows the step-by-step blocking procedure to set up your Micro Sprint race car. methanol and air to the cylinders. organizations attempt to limit costs by restricting the size of Decrease the turns in the left rear torsion bar stop (removing weight from the left rear). As per the Britannica definition- "..torsion bar, rod or bar that resists twisting and has a strong tendency to return to its original position when twisted. gallon tank. The basic A step by step on how to determine which parts are needed for installation, how to calculate the spring rate and other helpful tips along the way. This diagram shows how a torsion bar bolt is used to raise the suspension. Using a hammer, tap the winding bar to stretch the spring out -inch. Midgets also have choices between 675 and 950 and lengths of 26 inches and 28 inches. Speedway's King's Royal and The Big One (with $50,000 and the pumps. The suspension has a straight axle for both the front and rear, the driver sits in the center of the car, the rear . The steering wheel is made of 10 Degree Angle Broach. Here again, some Eagle Motorsports, Inc. put together a how-to video on installing their Stallard SST Rear Axle Assembly.

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