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Posted: 11/25/2003 8:53:56 AM EDT
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 1½ 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 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
1/2 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 at 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 red-line is actually quite high at 9500 rpm.

* 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 US $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
Link Posted: 11/25/2003 8:56:52 AM EDT
great post.
Link Posted: 11/25/2003 9:02:19 AM EDT
WOW! That was a good read - very descriptive - I want one. CR
Link Posted: 11/25/2003 9:06:49 AM EDT
Very neat analysis. I read several years ago that there was no practical way to dyno a top fuel dragster. Does anyone have any hard data on what the current HP/Torque are for one of these E-Ticket rides?
Link Posted: 11/25/2003 9:06:50 AM EDT
Yeah, but the EPA fuel economy figures must be a bitch! Also, what does JD Powers have to say about reliability and maintainence? [LOL] CW
Link Posted: 11/25/2003 9:09:05 AM EDT
Originally Posted By Cold_Warrior: Yeah, but the EPA fuel economy figures must be a bitch! Also, what does JD Powers have to say about reliability and maintainence? [LOL] CW
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Yeah! Where are the crash test numbers?
Link Posted: 11/25/2003 9:11:27 AM EDT
Acceleration = [i]dv/dt[/i]
Link Posted: 11/25/2003 9:11:32 AM EDT
Must be a pain having to repack the chute between stoplights.
Link Posted: 11/25/2003 9:11:42 AM EDT
That is really cool.[wow]
Link Posted: 11/25/2003 9:12:02 AM EDT
[Last Edit: 11/25/2003 9:17:51 AM EDT by CAMPYBOB]
Link Posted: 11/25/2003 9:12:53 AM EDT
thanks for the lesson. -HS
Link Posted: 11/25/2003 9:14:54 AM EDT
Originally Posted By CAMPYBOB: The discharge pressure of an SSME high-pressure fuel turbopump could send a column of liquid hydrogen 36 miles in the air
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Well, I'm from Missouri ... you gotta Show ME! Thar she blows!!!
Link Posted: 11/25/2003 9:22:08 AM EDT
Link Posted: 11/25/2003 9:34:23 AM EDT
One Top Fuel dragster 500 cubic inch Hemi engine makes more horsepower than the first 4 rows at the Daytona 500.
View Quote
well, in NASCARS defense, the Daytona 500 is a restrictor plate race, the cars are limited to 355ci and are naturally aspirated
* A stock Dodge Hemi V8 engine cannot produce enough power to drive the dragster supercharger.
View Quote
not with that kind of compression........well, not with the new hemi anyway
* The red-line is actually quite high at 9500 rpm.
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figured it was higher than that
* Top Fuel Engines turn approximately 540 revolutions from light to light!
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figured it would be alot higher than that
* Under full throttle, a dragster engine consumes 1½ gallons of nitromethane per second; a fully loaded 747 consumes jet fuel at the same rate with 25% less energy being produced.
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no nitropropane? pussies
Link Posted: 11/25/2003 9:46:35 AM EDT
Very cool post. I used to love to go to the drag races when I was younger.
Link Posted: 11/25/2003 9:51:58 AM EDT
Some trivia about freefall speeds. If you read the whole article he figures they'll go 350mph this year.[:D] Just an aside. Our equipment and bodies are not built to handle deployment at these speeds. A premature deployment is not an option.
The question has arisen about how fast people can really go. Well, I have thought about that a lot and a couple years ago I started on a project to find out for myself. It has progressed to a new skydiving event. Anyone who thinks they can go pretty fast is welcome to come to Eloy at the end of the month and show their stuff. December 27 - 29 is the second annual Arizona Speed Trials. You get three jumps from 13,000 to go as fast as you can. ($13 jumps the whole boogie, and a small fee for the Skycorder rental) Fastest time wins. Speeds are measured from 11,000 AGL through 5,000 AGL. The record to beat from last year is [red]321 MPH[/red], held by Charles Bryan (wearing MY suit and MY helmet >:-/) I am told a show called The Extremists will be out to cover the event.
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[url]http://www.afn.org/skydive/sta/dta/speed.txt[/url]
Link Posted: 11/25/2003 10:13:47 AM EDT
I do question this sentence. "* Under full throttle, a dragster engine consumes 1½ gallons of nitromethane per second; a fully loaded 747 consumes jet fuel at the same rate with 25% less energy being produced." What the hell do they mean by "energy being produced" ?? Did they mean "work" instead of "energy" ?
Link Posted: 11/25/2003 10:24:39 AM EDT
a lot of these top fuel cars and whatnot run really rough at idol for two reasons. 1) they have huge ass valves (no kidding, but the more minor of the two actually), and 2) the cam shaft is not concentric. it is actually ground out of phase. there is so much torque applied at launch and during the run that the cam shaft twists back into phase. the difference can be as much as 15-20 degrees i believe.
Link Posted: 11/25/2003 2:09:16 PM EDT
Originally Posted By TexasEd: I do question this sentence. "* Under full throttle, a dragster engine consumes 1½ gallons of nitromethane per second; a fully loaded 747 consumes jet fuel at the same rate with 25% less energy being produced." What the hell do they mean by "energy being produced" ?? Did they mean "work" instead of "energy" ?
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No, they would mean energy, but the fuel for the jet is less dense so that it *should* produce less. That's just plain sense.
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