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Acceleration

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Secret go fast trick revealed

D-50

For you guy's that like speed and power



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* One Top Fuel dragster 500 cubic inch Hemi engine makes more horsepower than the first 4 rows at the Daytona 500.



* Under full throttle, a dragster engine consumes 1O gallons of nitromethane per second; a fully loaded 747 consumes jet fuel at the same rate with 25% less energy being produced.



* A stock Dodge Hemi V8 engine cannot produce enough power to drive the dragster supercharger.



* With 3000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into a near-solid form before ignition. Cylinders run on the verge of hydraulic lock at full throttle.



* At the stoichiometric 1. 7:1 air/fuel mixture for nitromethane the flame front temperature measures 7050 degrees F.



* Nitromethane burns yellow. The spectacular white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapor by the searing exhaust gases.



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



* Spark plug electrodes are totally consumed during a pass. After 1/2 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 the fuel flow.



* If spark momentarily fails early in the run, unburned nitro builds up in the affected cylinders and then explodes with sufficient force to blow cylinder heads off the block in pieces or split the block in half.



* In order to exceed 300 mph in 4. 5 seconds dragsters must accelerate at an average of over 4G's. In order to reach 200 mph well before half-track, the launch acceleration approaches 8G's .



* Dragsters reach over 300 miles per hour before you have completed reading this sentence.



* Top Fuel Engines turn approximately 540 revolutions from light to light!



* Including the burnout the engine must only survive 900 revolutions under load.



* The red-line is actually quite high at 9500 rpm.



* The Bottom Line; Assuming all the equipment is paid off, the crew worked for free, and for once NOTHING BLOWS UP, each run costs an estimated US $1,000. 00 per second. The current Top Fuel dragster elapsed time record is 4. 441 seconds for the quarter mile (10/05/03, Tony Schumacher). The top speed record is 333. 00 mph (533 km/h) as measured over the last 66' of the run (09/28/03 Doug Kalitta).



Putting all of this into perspective:



You are driving the average $140,000 Lingenfelter "twin-turbo" powered Corvette Z06. Over a mile up the road, a Top Fuel dragster is staged and ready to launch down a quarter mile strip as you pass. You have the advantage of a flying start. You run the 'Vette hard up through the gears and blast across the starting line and past the dragster at an honest 200 mph. The 'tree' goes green for both of you at that moment. The dragster launches and starts after you. You keep your foot down hard, but you hear an incredibly brutal whine that sears your eardrums and within 3 seconds the dragster catches and passes you. He beats you to the finish line, a quarter mile away from where you just passed him.



Think about it, from a standing start, the dragster had spotted you

200 mph and not only caught, but nearly blasted you off the road when he passed you within a mere 1320 foot long race course.

________________________

That, folks, is acceleration.
 
Sounds a lot like my truck!:-laf















well,









maybe not











a lot--



but the cutting the fuel part for shut-off, that's just scary similar. :cool: :D



Thanks for the TopFuel school. Now wonder if you can give us that kind of detailed info on the Sheid truck?:p ;) :D
 
that is some incredible information!



i never thought about the limited total number of revolutions the engine makes during a run. does the 900 number include initial start up, burn out, and shut down after the end of the 1/4?



wow!



those crews do a lot of work for less than 1000 revs per run :--)
 
After the end of the race, tow the dragster back to the tent, tear it down and rebuild/replace the engine for your next run a little later that day.
 
A friend of mine drives the Orielly Top Fuel dragster. It's amazing being around them in the pits watching them work on that thing. I've ran a drag car for years but I don't think I could enjoy having to rebuild in 45 minutes after every pass. I'll stick with watching him do it. He tests at my local track and has ran a 3. 32 1/8 mile there. That just incredible. The owner of the rail actually owns that track so they do all of their testing their.
 
I have always been in awe of an engines performance. Even at 6000 rpm, do the math and see how many time a second the valves open and close, how many times the plugs spark, etc... It almost seems impossible that it can happen. Then do the math at 10000 rpm that some race cars do... . wow!!



Robin
 
Originally posted by Mtngoat

I have always been in awe of an engines performance. Then do the math at 10000 rpm that some race cars do... . wow!!



Robin

Check out the F1 (Formula 1) They turn 16,000 or better. Will make your hair stand on end to hear one go by. They use a pnuematic valve train to eliminate valve float at those R's. Oh, and they have to stay together for an hour or two.
 
Not to NitPick, but, at 10 Gallons per second, he would run out of fuel at about 140 miles an hour into his run, before the second timing light. A Top Fueler burns about 4 to 5 gallons for a run, which is about 1-1/2 gallons per second, the flow rate is 65 gallons per minute at 400PSI, The tank is anywhere from 12 - 18 gallons, and a full pass, including burnout, back-up staging and launch uses about 10 - 12 gallons. Doesn't leave much for playing around at the staging light.



And, its pretty crappy fuel mileage, about 16-20, GPM, gallons per mile.



Still, wow:eek:
 
Not to NitPick, but, at 10 Gallons per second, he would run out of fuel at about 140 miles an hour into his run, before the second timing light.



I noticed that also, at 10 gallons per second it would be 600 gallons/minute.

According to my pipe flow charts the fuel line would have to be 8 inches in diameter to flow that much.



I'm also skeptical about the number of revolutions per run.
 
this is an interesting thread... we need more info on here as well about other interesting things. I have read this thread to a few other people and they were like "Whoa". . haha, oh well. . Happy belated Turkey day!



-Chris-
 
Originally posted by illflem

I noticed that also, at 10 gallons per second it would be 600 gallons/minute.

According to my pipe flow charts the fuel line would have to be 8 inches in diameter to flow that much.



I'm also skeptical about the number of revolutions per run.



Thats actually pretty close, average RPM 7200 would be 540 Revs in 4. 5 seconds. I think the average RPM would be closer to 8500 over the run so that would be 637, but thats nit picking. :D
 
The small number of revs-per-pass has to be estimated. If you simply take a given RPM and multiply by the ET, you're not considering all the time the engine in below and/or above that RPM. But then many racecars have onboard computer systems that look at every component during racing--later analysed by the teams.



A whole lot of revolutions are consumed if you count "idle" time in the lanes. How long is the engine running from pre-stage until green light and at what RPM?
 
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