Jacko3 wrote:C-Kwik:
Wow! In the stable of Nissans, and in the entirety of your mechanical knowledge, you can't figure out which one is little, given that I had said I have over 200,000 miles? Let me help your infallible knowledge---It is not a Nissan Versa. Does that help? I can't imagine anyone not knowing which Nissan is the little one. I guess you would be confused if I also said, my little Toyota.
Uhh? Go back and read up on some Nissan and Datsun history. There are too many small Nissans that could potentially have more than 200,000 miles on them. It could vary on one’s interpretation of “little” as well. Some of the early Maximas can be considered little by today’s standards.
Jacko3 wrote:Your speculations about poor driving are totally wrong. You know what I have come to discover, you use your not-so compelling technical knowledge to try to demean people. But you failed on that account! A clutch will smell while driving for no reason. It does not even have to be during shifting or poor shuifting. Please give me a break. Have you ever seen a car catch fire because the clutch just suddenly over heated? Well, I have---twice. I am solidly sure you haven't. So, stop saying things you have no idea about. You are theorist and not a pragmatist. Even the manufactuerers of the cars we drive, who have certified engineers, don't fully understand why the G-35 behaves a certain way in some instances. It takes them time to figure it before sending out a TSB. How much more you, who probably don't work for an auto manufacturer. You think your "howstuffworks" knowledge is real knowledge about cars? Give me a freaking break!
I don’t come here to try and demean people. I try to correct them if they are wrong. If I know or feel something someone else states is wrong I point it out. If one feels demeaned as a result, it’s not my intent. The fact of it is, the truth can hurt.
Nope, I’ve never overheated a clutch before (except when a clutch malfunctions or is in need of replacement). So naturally, I wouldn’t smell it as I’ve given it no reason to. And it most certainly wouldn’t have caught on fire.
My argument here would be that clutches don’t spontaneously catch fire or overheat for no reason. Automakers would have legal problems if they did. In my prior career as an insurance adjuster, I have seen many cases where fuel lines, power steering fluids, oils and transmission fluids caused fires. Never had I ever heard of a clutch catching on fire or starting a fire. Some of which the manufacturers had to pay for.
Jacko3 wrote:C-KWIK, OMG you dare to question my physics and chemistry? Are you really serious?
Absolutely I do. Just as you question mine. It's hypocritical to think that you can question one's knowledge and not be questioned yourself. As I said before, you are more than welcome to question mine. But you better be able to back it up.
Jacko3 wrote:C-KWIK LET ME TUTOR YOU A BIT ABOUT AIR. SO LONG AS A VACUUM DOES NOT EXIST, AIR WILL FILL ANY SPACE IT COMES IN CONTACT , EVEN IN MILLIMETERS. AND WHEN AIR FILLS ANY SPACE, ESPECIALLY ONE WHERE THERE IS HEAT, IT WILL TRANSFER THAT HEAT in/OUT BY CONVECTION. THERE ARE GENERALLY 3 METHODS OF HEAT TRANSFER---CONDUCTION, CONVECTION, AND RADIATION. I HOPE YOU ARE STILL READING BECAUSE YOU REALLY NEED A STRONG DOSE OF PHYSICS AND CHEMISTRY. STOP SAYING THINGS THAT YOU KNOW NOTHING ABOUT.
The point I’m making here is that air is a poor heat transport. The mass of air that exists at sea level is quite small compared to a big hunk of metal (the flywheel and pressure plate) Both the flywheel and pressure plate has a greater ability to absorb more heat and at a faster rate than a small layer of air that could exist between the pressure plate, clutch disc and flywheel.
Jacko3 wrote:WHAT IS THE DENsITY OF AIR, SINCE YOU THINK YOUR CHEMISTRY IS SOUND, and in what measurements is that density? AIR IS NOT MADE UP OF A FEW MOLECULES. IT IS MADE UP OF A COMBINATION OF MOLECULES FROM OXYGEN, NITROGEN, HYDROGEN, AND INERT GASES. THERE IS NO CHEMICAL EQUATION FOR AIR, SO HOW COULD YOU SUGEST THAT IT HAS A FEW MOLECULES---WRONG CHEMISTRY?
I never suggested there were few molecules. I stated that there were few molecules in comparison of a liquid or solid of the same volume.
*Edited as this line was incomplete*
The density of dry air at STP [standard temperature(0 degrees Celsius) and pressure(1 bar or about 14.7 psi)] is 1.292 kg/m^3. This does not include any effects of water vapor. Water vapor will reduce this depending on the actual humidity level of the air. But if you read carefully, you’ld find that I said it was a small amount of air compared to a solid or a liquid. Water has a density of about 1000 kg/m^3. Iron has a density of about 7,870 kg/m^3.
Air also has less thermal conductivity than metals and water. Air has a thermal conductivity of about 0.025 watts/meter*Kelvin. Water is at about .06 watts/meter*Kelvin. And Iron is at about 80 watts/meter*Kelvin.
Thermal conductivity and density together make the flywheel and pressure plate a much better medium for transporting heat away from the clutch disc material.
There are a few simple things you can do to simulate the effects I am describing here. The first is probably not feasible in your area, but I’m sure you can imagine the effects. If you stood in nothing but your underwear in 40 degree Fahrenheit air you’ld probably freeze to death if you stayed in it long enough. Try submerging yourself in 40 degree Fahrenheit water. I guarantee you would freeze to death faster in the water. This is mainly because water is denser than air which allows it to absorb more heat and can carry more heat away from your body at a faster rate. A more feasible experiment is to open up your freezer and stick your hand in it. You’ll notice it is cold but you can probably bear it for some time. Now try freezing a block of metal in the same freezer and then put your hand on it. You’ll notice it will feel much colder and if big enough and enough of your hand is on it, you’ll probably want to let go as it becomes painfully uncomfortable very quickly. Again, it is able to carry more heat away faster than air alone.
Jacko3 wrote:Christ, some on this blog who have no idea about physics and chemistry, would sheepishly beleive your comments, when in fact, they are developed from pseudoscience. As you can see, from other topics, I am not only sound in business concepts. I am also sound in my sciences. Make sure you say no more about the physical sciences, because I will be there to correct you big time. Stick to cars adn their mechanism, and stop trying to tell us the little science you picked up from Wikipedia.
If you want to prove me wrong, do so by countering the science I am pointing out. Even if all of my sources were Wikipedia based, if it’s accurate, what’s the difference?
Jacko3 wrote:And then you speak about racing brakes and venting. Well, the reason why the pumps are used is to increase air flow so that a more efficient heat trasfer from convection is achieved. In the absence of efficient heat transfer, one is left to use increased time, as in the case of my clutch, by seperating the clutch from the flywheel for a period of time, until some type of colling has occured, albeit inefficiently.
The effects from a brake’s cooling vanes are increased by pumping air through it. It takes considerably more time to cool a brake rotor that is stopped than one that is moving at a high rate of speed.
Jacko3 wrote:I could also care less if you want to brag about your mechanical skills as you do here all the time. The rest of what you have said is total nonsense. You seem to lack some type of humility in your commentary. Anyway, who cares. All I am saying here is that you should stop speaking about your pseudoscience. I doubt you are that great with mechanical stuff, anyway. I think you are just a theorist at heart. I haven't heard you speak about how to move a wrench on a car just yet.
Again, it’s irrelevant. But if it helps, I’ve built a 500 HP Supra, a 450 HP Supra, Rebuilt the motor on one of those Supras, built a turbo 240sx, upgraded brakes, suspension and stereo equipment in just about everything I’ve owned. I actually spent most of the day yesterday installing a spare tire lock, replacing the diff fluid, transmission fluid belts and oil on the Titan. I may try and change the oil and plugs on my motorcycle today. And I’ve actually replaced 7 clutches on 5 different cars.
Jacko3 wrote:I will be reading very closely for your wrong pseudoscience. You just stepped into my turf as far as sciences are concerned. There are very fuew areas in the sciences I am not aware of. One of those areas is combustion, where very few in the sciences actually focus. So, stick to combustion and nothing more. The last time you discussed octane ratings, I said very little becasue that is the area where my science is limited,
I don’t try and claim to know anything. I share what I know and that’s it. Saying you know something is one thing. Showing it is another story altogether.
Jacko3 wrote:yOU ARE REALLY INCREDIBLE IN YOUR EXPLANATIONS. hOW CAN ANYONE WHO IS GOOD WITH THE SCIENCES CONCLUDE THAT WHEN TWO SOLID PIECES, A CLUTCH AND FLYWHEEL, COME INTO CONTACT, THAT THE FRICTION BETWEEN THE TWO WILL NOT GENERATE HEAT? THIS IS BAFFLING? I MEAN IN CHEMISTRY, WE SAY THAT AN EXOTHERMIC REACTION WIL OCCUR, AND IN PHYSICS WE SAY THAT KINETIC ENERGY DEVELOPED BY MOVING PARTS, WITH THE ASSISTANCE OF INERTIA, WILL GENERATE HEAT.
Most of the time a clutch should experience static friction. This means, the clutch disc, pressure plate and flywheel should be moving at the same speed, essentially locked together. But when starting a car off from a stop and perhaps for very brief moments during shifts, there will be a small amount of kinetic friction (or more accurately sliding friction). Static friction does not generate heat. Kinetic friction does. Kinetic friction should be (if you are driving correctly) a very small percentage of the type of friction a clutch experiences.
Jacko3 wrote:I REALLY HAVE TO ASK, WHAT SCIENCE BOOKS DO YOU READ? PLEASE TELL US. I AM EXPECTING YOUR LONG AND PROBABLY UNREWARDING RESPONSE, AS ALWAYS.
I read whatever literature I come across that either sparks my interest or is required of me to accomplish a task. But as with everything else, it is highly irrelevant. What is relevant is the theories and facts of science and applying them to the problem. If you feel I am wrong, that’s fine. But prove it with facts. Throwing out suggestions that my knowledge and perhaps source of knowledge are wrong is not proof of anything. Show me the science that would prove me wrong. I only claim to provide information and knowledge to the best of my abilities and experiences. I’m the first to admit that I can be wrong. But if I am wrong, I expect and hope that someone can do so by making a cohesive technical argument. This is one of the ways that I learn. In fact, a good deal of knowledge I’ve gained over the years is because of that.