[DeTomaso] NPC- Definition of acceleration

Mon Oct 12 15:57:48 EDT 2009

Problem arises if there is missfiering, the hydrolock is a result.
Dual sparkpluggs is a good idea then.
Goran

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Från: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]
För Sean Korb
Skickat: den 12 oktober 2009 20:57
Till: List Pantera
Ämne: Re: [DeTomaso] NPC- Definition of acceleration

58-65 degrees spark advance.  By the time the piston is at TDC, much
of the charge has already burned.

sean

On Mon, Oct 12, 2009 at 2:28 PM,  <adin at frontier.net> wrote:
>
> An old, old email.
>
> But, if one thinks a moment . . . .(whew) running a 1.7 to 1 fuel mix
> means that over 1/3 of the charge is "liquid" ??????  At that
> compresion ratio, isn't that true hydro-lock????
>
> How does that work?
>
>
>
>
> Quoting "michael at michaelshortt.com" <michaelsavga at gmail.com>:
>
>> A friend sent this to me, fun read.
>>
>>
>>
>> For all of you old drag racers
>>
>>
>>
>> THE 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
>> but 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 heat of the 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
immediately
>> builds up in
>> the affected cylinder 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 one 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 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.
>>
>>  ... and that my friend, is ACCELERATION!
>>
>> --
>>
>>
>>
>>
>>
>>
>>
>> Michael L. Shortt
>> Savannah, Georgia
>> www.michaelshortt.com
>> michael at michaelshortt.com
>> 912-232-9390
>>
>>
>> This email is protected by the Electronic Communications Privacy
>> Act, 18 U.S.C. Sec. 2510-2521, is confidential and may be legally
>> privileged.  If you are not the intended recipient, you are hereby
notified
>> that any retention, dissemination, distribution or copying of this
>> communication is strictly prohibited.  Please reply to the sender
that you
>> have received this message in error, then delete it.  Thank you
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-- 
Sean Korb spkorb at spkorb.org http://www.spkorb.org
'65,'68 Mustangs,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera
#1382
"The more you drive, the less intelligent you get" --Miller
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