Sunday 13 October 2013

TOP FUEL DRAG MOTOR FACTS . . . . AS SOME OF YOU WILL BE AWARE, I'M A DRAG RACING TRAGIC, NOTHING STIRS MY LOINS LIKE QUARTER MILE ACTION . . . . EVEN THOUGH MY HEART LIES WITH THE CLASSIC ERA OF THE SIXTIES, THE REALITIES OF THESE MONSTER LUMPS OF RECIPROCATING RAGE BLOWS MY MIND . . . . HOW THEY MANAGE TO RESIST THE IMMUTABLE FORCES OF THE LAWS OF PHYSICS BY NOT EXPLODING ON EVERY RUN IS A BLOODY MIRACLE !!!

Ever wonder why a top fuel dragster gets a rebuilt engine after each run . . . . a mate of mine put this up on his site this arvo and it proved absolutely riveting.

Stay with this - even if you aren't a 'car nut', this is a total factual mindfuck.

* One Top Fuel dragster outfitted with a 500 cubic-inch replica Dodge (Keith Black, etc) Hemi engine makes more horsepower (8,000 HP) than the first 4 rows of cars at NASCAR's Daytona 500.

* Under full throttle, a dragster engine will consume 11.2 ga
llons of nitro methane per second; a fully loaded Boeing 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 merely drive the dragster's 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 lockup
at full throttle.

* At the stoichio metric 1.7:1 air/fuel mixture for nitro methane the flame front temperature measures 7050 degrees 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. Which is typically the output of a small electric arc welder in each cylinder.

* Spark plug electrodes are totally consumed during a pass. After 1/2 way thru the run, the engine is 'dieseling' from compression and the glow of the 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 enough force to blow the cylinder heads off the block in pieces or split the block in half !!

* Dragsters reach over 300 MPH + . . . . before you have completed reading this sentence.

* In order to exceed 300 MPH in 4.5 seconds, a dragster must accelerate an average of over 4 G's. In order to reach 200 MPH well before reaching half-track, at launch the acceleration approaches 8 G's.

* 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 9500 RPM.

* THE BOTTOM LINE: Assuming all the equipment is paid for, the pit crew is working for free, 
& NOTHING BLOWS UP, each run will cost an estimated $1,000 per second.

0 to 100 MPH in .8 seconds (the first 60 feet of the run)

0 to 200 MPH in 2.2 seconds (the first 350 feet of the run)

6 g-forces at the starting line (nothing accelerates faster on land)

6 negative g-forces upon deployment of twin 'chutes at 300 MPH
An NHRA Top Fuel Dragster accelerates more quickly than any other land bound vehicle on earth . . . . 
quicker than a jet fighter plane . . . quicker than the space shuttle . . . . or snapping your fingers !!

The current Top Fuel dragster elapsed time record is 3.72 seconds for the quarter-mile. [2012]

Let's now put this all into perspective:
Imagine this . . . . you are driving a new $140,000 Lingenfelter twin-turbo powered Corvette Z-06. Over a mile up the road, a Top Fuel dragster is staged & ready to 'launch' down a quarter-mile strip as you pass. You have the advantage of a flying start. You run the 'Vette hard, on up through the gears and blast across the starting line & pass the dragster at an honest 200 MPH . . . . the 'tree' goes green for both of you at that exact moment. The dragster departs & starts after you. You keep your foot buried hard to the floor, and suddenly you hear an incredibly brutally screaming whine that seares and pummels your eardrums & within a mere 3 seconds the dragster effortlessly catches & passes you. He beats you to the finish line, a quarter-mile away from where you just passed him. Think hard about this – from a standing start, the dragster had spotted you 200 MPH . . . . and it not only caught, but nearly blasted you off the planet when he passed you within a mere 1320 foot long race !!!!

That, my friends.....is acceleration.

AND THEN THERE IS THIS DEMO OF JUST HOW MUCH JUICE THESE BEHEMOTHS INGEST, ADMITTEDLY VIA MULTIPLE SETS OF INJECTORS . . . . BUT YOU GET THE GENERAL PICTURE . . . . NEXT TIME YOU BITCH ABOUT FUEL CONSUMPTION, CAST YOUR MIND BACK TO THIS.

2 comments:

  1. At Dragstalgia, Santa Pod, I got talking to one of the pit crew of one of these beasts, and he said that they use the tyre changing shape, as it spins up, as another gear, nuts!

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    Replies
    1. Indeedly mate, a whole new world of physics defeating magic going on there, love it all, big lump in the y-fronts every time.

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