[DeTomaso] NPC- Definition of acceleration

Thomas Tornblom Thomas.Tornblom at Hax.SE
Mon Oct 12 14:54:17 EDT 2009





12 okt 2009 kl. 20.28 skrev adin at frontier.net:

>
> 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?

Air to fuel ratios are per weight, not by volume.

So for 1.7 kg air it uses 1 kg fuel.

This ratio is around 14.7:1 for gas and much lower for alcohol, so it  
doesn't sound totally out of range.

Thomas
>
>
>
>
> 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
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>> 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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