Diverse Interests X - BMW Luxury Touring Community
 
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post #1 of 11 Old Dec 17th, 2009, 10:09 am Thread Starter
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Diverse Interests X

**DEFINITION OF ACCELERATION**

One top fuel dragster 500 cubic inch Hemi engine makes more horsepower than the first 4 rows of stock cars at the Daytona 500.

It takes just 15/100ths of a second for all 6,000+ horsepower of an NHRA Top Fuel dragster engine to reach the rear wheels.

Under full throttle, a dragster engine consumes 1-1/2 gallons of nitro methane per second; 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's supercharger.

With 3,000 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 (stoichiometry: methodology and technology by which quantities of reactants and products in chemical reactions are determined) 1.7:1 air/fuel mixture of nitro methane, the flame front temperature measures 7,050 deg F.

Nitro methane 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 halfway, the engine is dieseling from compression, plus the glow of exhaust valves at 1,400 deg 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 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 redline is actually quite high at 9,500 rpm.

Assuming all the equipment is paid off, the crew worked for free, and for once NOTHING LOWS UP, each run costs an estimate $1,000.00 per second.

The current top fuel dragster elapsed time record is 4.428 seconds for the quarter mile 11/12/06, Tony Schumacher, at Pomona , CA ). The top speed record is 336.15 mph as measured over the last 66' of the run (05/25/05 Tony Schumacher, at Hebron , OH ).

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 pass 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 1,320 foot long race course.

...... and that my friends, is ACCELERATION!

Dave Hoogerland

'08 Triumph Tiger 1050 ABS
'02 K1200LTC "The Silver Snoopy" (gone but not forgotten)
'08 Can-Am Spyder "???"

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post #2 of 11 Old Dec 17th, 2009, 10:15 am
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Re: Diverse Interests X

Nice way to look at it.

wild bil
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post #3 of 11 Old Dec 17th, 2009, 7:22 pm
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Re: Diverse Interests X

Sure makes my 0-60 in 5.2 look slow, but at least I get better mileage and my plugs last longer.

Ride 'em if you got 'em.
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post #4 of 11 Old Dec 17th, 2009, 7:48 pm Thread Starter
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Re: Diverse Interests X

If you consider yourself a motorhead, you must...sometime in your life...stand where this guy is while they're warming up a nitro top fueler. The sound, the smell, the pounding in your chest, the nitro burn in your eyes....yeah baby!


Dave Hoogerland

'08 Triumph Tiger 1050 ABS
'02 K1200LTC "The Silver Snoopy" (gone but not forgotten)
'08 Can-Am Spyder "???"

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post #5 of 11 Old Dec 17th, 2009, 8:00 pm Thread Starter
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Re: Diverse Interests X

Quote:
Originally Posted by DaveDragon
"Top fuel engines turn approximately 540 revolutions from light to light! Including the burnout, the engine must only survive 900 revolutions under load."

This set off my BS detector...

The rest is, well what it is! Interesting.
That's about right. 2 second burnout and a 4.5 second run @ ~8500 rpm

Dave Hoogerland

'08 Triumph Tiger 1050 ABS
'02 K1200LTC "The Silver Snoopy" (gone but not forgotten)
'08 Can-Am Spyder "???"

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post #6 of 11 Old Dec 17th, 2009, 8:27 pm
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Re: Diverse Interests X

Quote:
Originally Posted by DaveDragon
"Top fuel engines turn approximately 540 revolutions from light to light! Including the burnout, the engine must only survive 900 revolutions under load."

This set off my BS detector...

The rest is, well what it is! Interesting.
540 revolutions on a 9500 RPM engine is 3.42 seconds. Another 2.27 seconds for the burnout gets you to 900 revs under full load. That seems plausible to me.

David Taylor
San Jose, CA
2010 R1200RT Polar Metallic
AMA, BMWMOA
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The shortest distance between two points is for people who don't ride!



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post #7 of 11 Old Dec 17th, 2009, 11:39 pm
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Re: Diverse Interests X

Here is the math . . .



So the numbers published are in the range but not spot on . . .

Dan Finazzo
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post #8 of 11 Old Dec 18th, 2009, 8:15 am Thread Starter
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Re: Diverse Interests X

Quote:
Originally Posted by dfinazzo
Here is the math . . .



So the numbers published are in the range but not spot on . . .
Probably even closer as I would imagine they actually run at a number below the redline you've used in the calcs.

Dave Hoogerland

'08 Triumph Tiger 1050 ABS
'02 K1200LTC "The Silver Snoopy" (gone but not forgotten)
'08 Can-Am Spyder "???"

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post #9 of 11 Old Dec 18th, 2009, 8:22 am
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Re: Diverse Interests X

Quote:
Originally Posted by dfinazzo
Here is the math . . .



So the numbers published are in the range but not spot on . . .
Spot on or not, this was the most interesting thread I have read in months.

Thanks

DanMartin
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post #10 of 11 Old Dec 18th, 2009, 11:39 am
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Re: Diverse Interests X

True, it's spawned at least 2 conversations with friends of mine that allowed us to explore our gearhead geekiness to its fullest potential.

David Taylor
San Jose, CA
2010 R1200RT Polar Metallic
AMA, BMWMOA
Booze Brother #4

The shortest distance between two points is for people who don't ride!



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post #11 of 11 Old Dec 18th, 2009, 4:24 pm
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Re: Diverse Interests X

Quote:
Originally Posted by DaveDragon
mea culpa, bs detector recalibrated
Yeah, my guess is The CRAPPER had it skewed way of to one side.

David Taylor
San Jose, CA
2010 R1200RT Polar Metallic
AMA, BMWMOA
Booze Brother #4

The shortest distance between two points is for people who don't ride!



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