[s-cars] FW: [megasquirt] Definition of Acceleration

[Mihnea Cotet]

>X-Original-To: quattro at audifans.com
>Delivered-To: quattro at audifans.com
>From: Alan Pritchard <apritchard at seaeye.com>
>To: "Quattro List (E-mail)" <quattro at audifans.com>
>Date: Mon, 5 Jan 2004 13:56:17 -0000
> >From megasquirt list
>
>Subject: The definition of acceleration.
>* 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 1-1/2 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 (stoichiometry: methodology and technology by which
>quantities of reactants and products in chemical reactions are determined)
>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 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 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 9500rpm.
>* 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
>$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
>
>Greg Schriner
>*Gear Head*
>www.schrinersspeedshop.com
>
>
>[Non-text portions of this message have been removed]
>
>
>
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