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Watching drag racing on Fox, live.
The top fuel do the quarter in under 4 seconds, Then they spend a hour rebuilding the engine.
I wonder what it feels like accelerating to 300mph in under 4 seconds?
0 to 100 mph is under 1 second.. 0.8 to be more exact.
Edits: 07/24/16Follow Ups:
And still draws huge crowds because it's great fun.
Electric racing is gaining ground, but would you attend?
Absolutely and Formula E makes it very easy given that all their races are run in inner cities.
Essentially I just love almost all forms of motor sports except two, drag and oval racing, which seem utterly pointless and deeply boring to me.
Actually a typical rebuild takes about 30-35 minutes. They then fire the car and set timing and check for any problems like leaks. They change the oil again. Usually around 13 quarts if I remember correctly?This is all done within a 55-65 minute time frame. They burn 90% nitromethane, 10% methanol. Nitro costs around $55 a gallon. They burn 15 gallons every run.
They record 5 G's during the run and up to -6 G's when the parachutes fully blossom.
Mike
I teach automotive and I never seen anyone rebuild an engine 35 min.With four or five good engine techs working,you could put an together in that time provided all the components were prepped and ready to go.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Fact beats theory. Those guy Do it. Not think it.
So maybe your class can't. Those guys can
What I;m talking about is taking out every piston and rod and all the caps and bearings that hold the crank..If they are starting with a short block where the crank,pistons,and timing gears are assembled and ready to go,then 35 min is very doable..A lot of the stuff is already and assembled and ready build..That's all I'm saying..On a typical engine rebuild,you are putting all the aforementioned pieces in yourself such as rings,wrist pins,rods,rod bearings,etc.In other words,they have a rolling short block ready to go with the pistons installed as well as the crank..You have to have all that prepped and the crank indexed because if you don't,the engine will blow on the first run.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 07/26/16
They have an extra engine laying in wait. What, you think they're stupid ?
Here is the tear down in 4 minutes
They have more than 4 or 5 guys pulling the motor & putting back together.
More like 10. They have less than an hour to be back to the line ready to go.
Now if the engine block is destroyed they put in a new engine. The top team have 10+ backups.
I thought I read somewhere that these engines have NO oil?
The windage resistance at those crank speeds would be awesome.The WIKI says oil, YES, but block and heads have NO water passages. This makes the block and heads stiffer and stronger.
Too much is never enough
Edits: 07/25/16
Oh ya, & lots of it.
They run a dry sump system which means there's no oil pan but have external tank/reservoir that holds the oil. Not sure how much but probably
around 10-15 gals.
Yes, no radiator or coolant. Is not only because there only running for a short time but the nitro/methane burns much cooler than petrol.
The engines run for a few minutes at startup.. Line up, then full blast for about 4 seconds!. Then idle and off.
The thing I was surprised was they mentioned ALL the mechanics tearing them down have to wear gloves.. as the parts are still really HOT.
Wow. No doubt true, but Jeez. handling 200F plus parts..
Every team has a time limit they want the car to run. It is usually right around 1.5 minutes total from start up till the end of the run. They take as many variables as possible out of the equation.
The amount of HEAT must be immense. But don't forget that Aluminum has a fairly low (for a metal) MELTING POINT or even a 'softening' point.
That's why fighter planes can only go So Fast. Much faster (and at lower altitudes) could cause structural problems due to heat from Friction.
The SR71 being an exception AND also made of Titanium Alloys.
Do they re-assemble using various Anti-Seize Compounds?
Too much is never enough
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