How Much Horsepower Doea Top Alcohol Funny Car Produce
Csaba Csere Machine and Driver
The Funny Car'southward cardinal component is an 8.1-liter (496 cubic inch!) V-8 developing about xi,000 horsepower and some 8000 lb-ft of torque. Oh, and it is capable of revving to 8500 rpm. The engine is a evolution of the legendary 426 Hemi V-8, using a block and heads machined from solid aluminum billets. This is possible considering the engine has no water passages. Its usual running time is so short, it gets past without a liquid cooling system. The compression ratio is about half-dozen.5 to i.
The Female parent of All Superchargers
When drag racers first started fitting superchargers to their engines, they repurposed Roots-type blowers originally developed by General Motors for a line of pre-World-State of war-Two-era two-stroke diesel heavy-equipment engines. Those half dozen-71 blowers, then named because they force-fed half-dozen 71-cubic-inch cylinders, have evolved into the purpose-built 14-71 blowers used today (GM, past the way, never built a 14-cylinder engine). The blower uses nineteen-inch-long rotors almost half dozen inches in bore to pump some 548 cubic inches (nearly ix liters!) of air per revolution. That's nearly four times the throughput of a Hellcat supercharger. Running at about twoscore percent higher rpm than the engine crankshaft, the supercharger develops about 55 psi of boost pressure. At full power, the supercharger requires the amend part of 1000 horsepower to do its work. Obviously, it gives back more horsepower in return.
The Funny Car burns a mixture of 90 per centum nitromethane and 10 percent alcohol—and information technology gulps down some 20 gallons of that mix in a single run. Nitromethane has a number of key properties that brand it the ideal drag-racing fuel. Showtime, it contains some of its own oxygen, so that instead of the 14.vii pounds of air needed to burn 1 pound of gasoline, just one.7 pounds of air is needed per pound of nitromethane. Fifty-fifty though nitro contains much less free energy per pound than gasoline, its ability to burn down richer means that it generates 2.3 times equally much power. Its other key holding is a loftier heat of vaporization, which means that it has a tremendous cooling consequence as it turns from liquid to vapor. That'south how the Funny Machine engine gets by with no liquid cooling system and no intercoolers.
Lots and Lots of Fuel Injectors
Funny Cars use a continuous-flow fuel-injection organization with a mess of injectors. The Contrivance machine has 32 of them: two in each intake port of the cylinder caput, 1 in each intake manifold runner (shown), and eight of them upstream on the supercharger (which serve to cool and lubricate the blower). These injectors are fed past a 300-gallon-per-hour fuel pump with dual-stage operation. Only the manifold and blower injectors operate during idle, while all 32 catamenia during full-power runs.
An Ignition System That Could Nigh Power a Welder
The engine uses two spark plugs per cylinder, and they are energized by dual magnetos. Those operate with some forty amps of main current to produce the very powerful spark needed to burn the super-rich and dense air-fuel mixture. Ignition timing is controlled by a crank trigger arrangement that retards the spark during the launch to reduce engine ability and non overwhelm the tires. Equally the vehicle'due south speed increases, the spark reverts to the maximum power accelerate of around 60 degrees.
No Transmission, simply a Hell of a Clutch
The Funny Car has no transmission other than a simple device to allow the machine to back upwards after a prelaunch exhaustion. Nevertheless, the Funny Car does use a complex multiplate centrifugal clutch to attain the gradual engagement needed to go from nothing to over 330 mph without any ratio changes. There are some 6 driven plates, made from sintered atomic number 26, sandwiched between the flywheel; plus five steel floaters and a centrifugal pressure plate, making an associates about 10 inches in diameter and 10 inches long. The driver's clutch pedal initiates the clutch engagement, but information technology's basically an on/off switch. The actual degree of engagement—and slippage—is regulated past the fingers in the centrifugal pressure plate, and force is provided by a pneumatic cylinder that is controlled through 9 stages of pressure by a timer. Controlling the clutch slippage past varying the weight and travel of the artillery on the centrifugal clutch, and the timing of the pneumatic cylinder is probably the most important tuning adjustment on the auto.
It Has a Uncomplicated but Strong Chassis
This engine and all of the other components are attached to a spaceframe chassis fabricated from stout chrome-moly steel tubing. The differential and front and rear axles are bolted solidly to this frame, which is designed to be somewhat flexible; its deflection serves every bit a rudimentary suspension. The strength of the integral roll cage and the flexibility of the extremities are controlled by varying both the bore and thickness of the tubing. The wheelbase measures near 125 inches—simply nether five inches longer than the production Charger SRT Hellcat sedan'southward dimension.
Information technology'due south Got One Doozy of a Fly
The Charger Hellcat Funny Auto's fully enveloping carbon-fiber body is designed to generate maximum downforce with minimum drag. Basically, it consists of a potent wedge that terminates in a large, boxed-in rear wing. The torso tapers, so information technology's narrower in the rear than in the front.
Equally in All Racing, Aero Matters
Past the fourth dimension the Dodge hits the speed traps at the drag strip, Matt Hagen says, the car develops virtually 8000 pounds of downforce. It isn't clear if that figure includes the roughly grand pounds of downforce produced by the upward-firing frazzle headers (yep, the exhaust's menstruation is then voluminous and hot, it contributes to downforce), just downforce figures in the thousands of pounds are impressive either mode.
Yes, at that place is some irony in the Funny Motorcar's needle-shaped body and Dodge's "widebody" graphics mimicking the production Charger SRT Hellcat Widebody'south wide-runway pattern. Try not to retrieve too hard about information technology.
Minimal Controls and Instruments
Inside the cardinal cockpit, you'll notice no instruments, as there isn't much for the driver to do but launch and steer (we'd add "hang on," but then that's obvious). There is a very short-travel throttle pedal forth with a clutch pedal. To the driver'southward correct is a hand restriction, which operates unmarried-piston brake calipers on all four wheels. To the left is a fuel-control lever that shifts from the idle to full-power fuel operation.
And so, What's It Like to Launch This Puppy?
Subsequently the obligatory pre-race exhaustion to warm the tires (which pb a short, difficult life), driver Hagen engages the clutch, which will be slipping liberally at these speeds, and uses the mitt brake to inch the car forward into the staging lights. By now, he has switched the fuel system to "high" and is holding the car stationary with the hand brake. He launches the motorcar simply before all the lights come on by releasing the paw restriction and flooring the throttle, which produces some four.0 thou's of acceleration. Now, Hagen is only steering and belongings on. If he has to release full throttle or touch the clutch, at that place is a problem, and the run is toast. Hagen says elevation acceleration of half dozen.v g's occurs at about ii seconds into the run, when the clutch fully engages and the machine is at about 200 mph. When he pops the twin drag chutes at the end of the strip, he briefly gets socked with 7.5 g'south worth of deceleration.
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Source: https://www.caranddriver.com/news/g28472074/dodge-charger-srt-hellcat-widebody-funny-car-in-depth/
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