The Definition of Acceleration

[quozl]

I'm sure Preeny will like this if he hasn't already read it or posted it. It was included in this months Porsche Club Newsletter.

Cheers Al

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; 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'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.

- 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 plug 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 BLOWS 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.

That's ACCELERATION!

[WABIT]

thats some scary info! insane **** us humans can produce

dom

[Spyda]

Thats prity amazing but doesnt the avarage polo do that? lol

[WABIT]

yes and no... a chipped one smashes a top fueler..

dom

[Swallowtail]

That is seriously cool stuff.... I love it!

[Buller_Scott]

thanks for the article....

that's rad.

[gareth_oau]

was reading a similar article in this month's Motor magazine.

also said that 0-160kph in 0.7secs.

To compare it to a V8 supercar:

assume the V8 was already travelling at 300kph (top speed along conrod straight) at the start of a 400m drag strip. At the same point/time the Top Fueller launches from standstill and accelerates.

the TF would beat the V8 to the finish line by 25 metres!

fuel consumption is a generous 20,000L/100km

[DubSteve]

yes and no... a chipped one smashes a top fueler..

dom

A chipped Polo only needs to accelerate up to 88mph and then it time travels back to the future!

[Mrk_Mickey]

Hahaha that is WICKED. Those facts are quite brutal and it makes me wonder how it all began...

bah. chipped polo's. they're faster than top fuellers, but they're just not cool enough.

[Rocket36]

yeah that's been floating around emails for a couple of years... would love to see an updated one. Always impressive to read though.