The Well-Run Machine

 

How often do you really think about how your car works? I’m guessing not that often. 

Perhaps you have a dim recollection of 4-stroke engine operation from a high school textbook. At any rate, you know that gasoline goes in, the car goes forward, and you are a wretched sinner for polluting the atmosphere in the process. You will also be late for work if it should fail to operate properly, or if that jerk in the left lane doing 50 in a 65 zone doesn’t get the heck over! If you think about it more you should remember that the combustion of the gasoline happens with pistons. But do you think about the details beyond that? Again, I would guess the odds are against it, unless you’ve had recent compelling need to do so, or are a gearhead.

Yet it would be worth your while to grab an engine repair manual sometime, not necessarily with the intention of being able to name each individual part, but with an eye towards marveling at the complexity. You see, every part in that engine has a overheadcamshaftpurpose, every part was put there by design to perform some job, every part had a designer, and every function performed by every part is a reaction to some other function. The engine itself ostensibly performs a very simple function, the conversion of chemical energy (gasoline and oxygen) into mechanical energy and heat, but the process for controlling that conversion is complex and full of nuance. When even small components fail the results can range from simple irritations to lethal failures.

Let’s start with the gas tank. You put in the fuel, but what happens next? The fuel must travel along a line to the engine, but how? Gravity? It would be amusing to contemplate vehicles with roof-mounted gas tanks like the old high-wall toilet tanks, but the real solution is to use a pump to draw the gas from the tank and shove it towards the engine.

So do we just throw the gas at the engine? Is it poured directly into the piston cylinders? No, you’ve got to turn it into a spray (atomize) so it mixes with the air, then you’ve got to somehow get the fuel and air mix into the cylinders. How is that done? Older engines used carburetors to mix the fuel and air, and that mix would be sucked down through a series of pipes towards the cylinders. The cylinders have valves that open just in time to draw in the mix. The valves snap shut, the spark plug triggers a detonation sending the piston speeding downward, imparting rotation to the crank shaft by way of a linkage on a pivot.

Already we can see the variety of mechanisms in play, and we must assume that each of the parts mentioned above has other more subtle interplays with further components. I said that the valves open, and shut-this implies some mechanisms for doing so, as well as other governing mechanisms ensuring that the openings and closings occur at the right moments. What makes the spark plug spark, much less what makes it spark at the right moment? How does the piston connect to the crank shaft? That explosion of fuel must generate some heat, what keeps that heat under control?  Presumably the moving metal parts generate friction too; how do we reduce or compensate for it?

Systems and subsystems abound, even in the simplest of engines, yet they work. In the past thirty years, spurred on by rising gas prices, competition for fickle customers, and, yes, even regulatory pressure, engineers have made tremendous improvements in efficiency, strength, power, and safety, and the vast majority of these improvements have all been in the nuances of the subsystems. The fundamental operation of the engine, however, has not changed-we are still converting, by way of combustion — rapid oxidation really — the energy of the chemical bonds in gasoline into the energy of movement.

2006 Chevrolet Corvette Z06My grandfather, a mechanic who passed away in 1984, would certainly be astounded at the engine advances. Yet he would also find many things still very familiar. The pistons, though far advanced, would still be there; the camshaft and pushrods would still be there; the oil pump and radiator would still be there. There are only so many conceivable ways of burning a fuel-air mixture and capturing that energy, and we know them well. The main alternatives to piston engines-the jet turbine, the rocket, and the Wankel Rotary, are all old technologies themselves. Click here for a great view of other types.

Society as An Engine

American society is much like that engine, with a myriad of components, sub assemblies, regulating mechanisms, intakes, outputs, and waste products, but the complexity is at a level far beyond our mere motor. Our fundamental “motor” since 1787 has been our Constitution, which is not a very long or complicated document. Like an early motor, it is simple in concept, but with an implied complexity of regulating mechanisms ranging from taxing structures (the “fuel supply” to stretch this analogy), balancers, timing mechanisms, and exhaust systems. Yet the core mechanism — like our 4-stroke gas engine — has remained unchanged in over two centuries.

We have certainly added complexity to our systems. Sometimes, just as the smog and environmental regulations of the 1970s sapped the horsepower of the engines of that time, the regulations and arbitrary limits we impose on ourselves derange and compromise our government, yet still our system chugs along. But there is no guarantee that it will continue to do so indefinitely. Capricious and ill-thought law changes have nearly killed the 4-stroke engine as we know it, and capricious or ill-thought law changes could end the government system we have enjoyed.

The peril from ill-thought change is great. Automotive history is full of questionable design flaws, from the maligned Corvair to the fiery Pinto, from the junky Fiat Spyder to the ugly Edsel. Of course the marketplace weeded these out over time, but removing dangerous modifications from our government is far harder. Modifications can, of course, improve the performance, but they can also upset the delicate balance that kept the apparatus working.

Worse still, the extreme left, the Socialists and Progressives — or whatever they’re calling themselves this week — actually want to break our motor and replace it with something else. They think they’ve discovered a new concept, a newer cleaner society, more efficient and more controlled, with fewer moving parts and better self-regulation. Yet they fail to see that the totalitarian model, in whatever guise imaginable, is old beyond recorded history. Within that history, its flaws are well documented from The Book of Kings, the records of the Pharaohs, or the archives of the Soviet Union. Just as the 4-stroke engine’s fundamentals have been constant from the 1800s to today, so too are the fundamentals of absolute rulers, regardless of modern bells and whistles.

And for the anarchists, no engine ever assembled itself. No human society of any complexity ever self-ordered. Some strong visionary individual, or some strong group of power holders always established the order, even if that initial order were nothing more than a sworn band of warriors dividing their spoils. Our society was designed.

rusty_engine_block_post_card-r9e97441fd66541fba1b45892aa644b69_vgbaq_8byvr_512Our civilization has many flaws, inefficiencies, unnecessary waste, misdirected energies, and design weaknesses not anticipated by its designers. Yet still it works.From time to time it needs a major overhaul (we’re past due for one right now). It may even need a total teardown and rebuild to root out the damage and wear, but still it runs, in many cases far better than the competing designs out there. Yet when mechanisms start to wear out, when ill-conceived tinkering throws the system out of balance, or when revolutionaries attempt to gut the entire system, we run the terrible risk of it all flying apart.

Cover image: Shutterstock user Oliver Sved.

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  1. user_1184 Inactive
    user_1184
    @MarkWilson

    skipsul:

    ctlaw:

    skipsul: Front-wheel drive cars have a similar problem as the sideways mounted engine can cause torque steering on hard acceleration.

    Isn’t torque steer is typically caused by left-to-right driveline asymmetries when trying to go straight?

    If so, torque steer is a dissimilar phenomenon from the effect of engine angular momentum on the Sopwith when turning.

    Any of the engineers here want to clarify this point?

    The effect on the Camel, called gyroscopic coupling, is an effect that appears in Euler’s Equations for Rigid Body Motion.  Euler took Newton’s Laws and extended them using calculus and geometry to apply to rotational motion as well.

    The effect is a perceived torque induced on the aircraft when there is a large amount of angular momentum along the plane’s longitudinal axis due to the spinning engine.  When you try to turn the aircraft perpendicular to that direction, you experience what is called an “omega cross H” torque: H is the engine’s angular momentum vector, and omega is a vector containing the roll, pitch, and yaw rates of the engine.

    Omega-cross-H is always perpendicular to both the axis of the engine and direction you are turning.  Practically speaking this means when you input pitch, the aircraft will also yaw, and vise versa, in a motion called precession.  This is exactly the same behavior as a toy gyroscope.  If you have a gyroscope spun up, and you set it on a pedestal, gravity tries to tip it over.  But instead of tipping all the way over, it precesses to the side.

    Torque steer in a car during fast acceleration cannot be caused by the same effect.  Although the engine has large angular momentum, the driver is not inputting a pitch or yaw torque on the car; he’s just trying to accelerate straight ahead.  The reaction torque the driver feels on the steering wheel is caused by the left front wheel experiencing different reaction torque than the right, either due to unequal traction or asymmetry in the drive train, and transmitting this difference as a torque back through the steering system.

    • #61
  2. skipsul Inactive
    skipsul
    @skipsul

    Mark, thank you very much for the clarifications on those points.

    • #62
  3. user_1184 Inactive
    user_1184
    @MarkWilson

    skipsul:Mark, thank you very much for the clarifications on those points.

    My pleasure.  The dynamics of spinning bodies is a strange and counterintuitive field.  I was immersed in it for several  years at work and still can’t claim to fully understand it.

    • #63
  4. skipsul Inactive
    skipsul
    @skipsul

    Mark Wilson:

    skipsul:Mark, thank you very much for the clarifications on those points.

    My pleasure. The dynamics of spinning bodies is a strange and counterintuitive field. I was immersed in it for several years at work and still can’t claim to fully understand it.

    I remember it was an area of physics where I often struggled.  Can you elaborate on your job?

    • #64
  5. user_1184 Inactive
    user_1184
    @MarkWilson

    skipsul: Can you elaborate on your job?

    Guidance, navigation, and control of rockets and missiles.  A huge part of the job is accurately simulating their motion.  We use Newton’s Laws, Euler’s Equations, detailed models of Earth’s gravity and atmosphere, aerodynamics, structural bending and oscillations, GPS, inertial measurement units, servoactuators, rocket propulsion systems, mass depletion and moments of inertia, etc.  Usually when it flies, the telemetry matches the simulation predictions.  Assuming you’ve done the simulation right, that is.

    • #65
  6. skipsul Inactive
    skipsul
    @skipsul

    Mark Wilson:

    skipsul: Can you elaborate on your job?

    Guidance, navigation, and control of rockets and missiles. A huge part of the job is accurately simulating their motion. We use Newton’s Laws, Euler’s Equations, detailed models of Earth’s gravity and atmosphere, aerodynamics, structural bending and oscillations, GPS, inertial measurement units, servoactuators, rocket propulsion systems, mass depletion and moments of inertia, etc. Usually when it flies, the telemetry matches the simulation predictions. Assuming you’ve done the simulation right, that is.

    Can we persuade you and anonymous to collaborate on more science posts, please?  This sounds very very cool.

    • #66
  7. hawk@haakondahl.com Member
    hawk@haakondahl.com
    @BallDiamondBall

    skipsul:

    Johnny Dubya: III, your comments put Mrs. Dubya in a better mood after I had read to her Skip’s tales of Fiat woes.

    They are pretty cars and fun to drive, no doubt, and like so many other classics with sufficiently large fan bases, the enthusiasts have done a fantastic job of correcting the faults and improving on the cars, making them better today than their designers could have conceived.

    What has been amusing to me regarding Corvettes is how there is such a wealth of parts out there, often improved over their originals, that I could build a “classic” corvette entirely out of new parts. (I’ve got an essay in the works right now on that subject).

    Anyone here a fan of Jay Leno’s garage? He did one recently on the Pantera, making just this same point:

    Well, the pantera was always a kit car, just assembled by grown-ups.

    • #67
  8. hawk@haakondahl.com Member
    hawk@haakondahl.com
    @BallDiamondBall

    That 1967 Mustang of mine with the 351W (and FMX) used to lurch around left turns if I got on it incautiously from a light, but not right turns.  If torque steer (never heard of it) involves a differential squashing of the front geometry, I can see how that could reinforce a foot-throw lurch one way but cancel it out the other.

    I remember thinking it was something in the chunk, but it was never  a problem unless I had my toes at the radiator.

    • #68
  9. user_1184 Inactive
    user_1184
    @MarkWilson

    Ball Diamond Ball: If torque steer (never heard of it) involves a differential squashing of the front geometry

    Yep, that’s one cause, except you’re in a rear wheel drive car.  So it’s not torque steer you’re experiencing, but maybe roll steer.  This is getting beyond my knowledge of vehicles too.

    • #69
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