"DEFINITION OF ACCELERATION" ..
(courtesy of KB Performance Pistons)
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.
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 through the pass,
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. (race and
burnout)
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 near ly blasted you off
the road when he passed you within a
mere 1,320 foot long race course.
... and that my friend, is
ACCELERATION!