sábado, 3 de setembro de 2011

Top Fuel Dragster Engines

...Já que o dono do Blog tá de molho, vão algumas curiosidades sobre os motores de Dragster.
A última notícia que li, na Performance Motorsport International Magazine de Julho 2011 dizia: Potencia máxima = 8000 hp. Te mete??!?!

Vão algumas estatísticas:

Some Interesting Top Fuel Dragster Facts:

-One dragster's 500-inch Hemi makes more horsepower then the first 8 rows at Daytona.

-Under full throttle, a dragster engine consumes 1 ½ gallons of nitro per second, the same rate of fuel consumption as a fully loaded 747, but with 4 times the energy density.

-The supercharger takes more power to drive then a stock hemi makes.

-With nearly 3000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into nearly-solid form before ignition.

-Cylinders run on the verge of hydraulic lock.

-Dual magnetos apply 44 amps to each spark plug.
This is the output of an arc welder in each cylinder.

-At stoichiometric (exact) 1.7:1 air/fuel mixture (for nitro), the flame front of nitro methane measures 7050 degrees F.

-Nitro methane burns yellow. The spectacular white flame seen above the exhaust stacks at night is raw burning hydrogen, dissociated from
atmospheric water vapour by the searing exhaust gases.

-Spark plug electrodes are totally consumed during a pass. After ½ way, the engine is dieseling from compression plus the glow of exhaust valves at 1400 degrees F.

-The engine can only be shut down by cutting off its fuel flow.

-If spark momentarily fails early in the run, unburned nitro builds up in those cylinders and then explodes with a force that can blow cylinder heads off the block in pieces or blow the block in half.

-Dragsters twist the crank (torsionally) so far (20 degrees in the big end of the crank) that sometimes cam lobes are ground offset from front to rear to re-phase the valve timing somewhere closer to synchronisation with the pistons.

-To exceed 300mph in 4.5 seconds dragsters must accelerate at an average of over 4G's. But in reaching 200 mph well before ½ track, launch acceleration is closer to 8G's.

-If all the equipment is paid off, the crew worked for free, and for once NOTHING BLOWS UP, each run costs $1000.00 per second.

-Dragsters reach over 300 miles per hour before you have read this sentence.

-Top Fuel Engines ONLY turns 540 revolutions from light to light!

-The redline is actually quite high at 9500rpm.

-To give you an idea of this acceleration, the current TF dragster elapsed time record is 4.477 seconds for the quarter mile.

-This means that you could be coming across the starting line in your average Lingenfelter powered "twin-turbo" Corvette at 200 mph (on a FLYING START) and the dragster would BEAT you to the finish line FROM A DEAD STOP in a Quarter mile distance!

NHRA Nationals RICHMOND - 2000. By JucaLodetti

NHRA Nationals RICHMOND - 2000. By JucaLodetti

Um comentário: