Opinions: Hubcaps and MPG...

Discussion in 'The Daily Grind' started by law_dawg, May 19, 2008.

  1. Doc Willie

    Doc Willie Shuttlecraft Commander

    Consider this:

    Drag racers, NASCARs, Formula 1s, dirt track stock cars, Indy cars do not use disc wheel covers. Bonneville land speed record vehicles, including the LSR Prius do.

    Implication: They make a significant difference only at very high speeds.
     
  2. Xringer

    Xringer Older Member


    I wonder why anyone would use disc wheels on a bike?
    [​IMG]
    Maybe she just doesn't know that disc wheels don't help at low speeds..?.
     
  3. Takashi

    Takashi FUD

    Finally someone brings up a critical point. I agree with you 100% on this one. This is especially true for the disc brakes on the front wheel. Why do you think performance cars have brake ducks and vented front discs for?

    There are a lot of warnings that are not mentioned in the car's manual. (e.g., make sure you don't fart in the car with the windows closed or else you will have to bear with the foul smell until the ventilation clears up the smell.) A lot of these are common sense but requires some baic knowledge about cars. Problems usually arise when people without basic understanding of cars believes their small inventions can provide instant satisfaction. (e.g., a driver decides it will be smart to cut their springs of the car in order to bring them closer to the ground. The minimum steps one needs to follow in order to properly lower a car is to replace the spring, shock, and properly realign all 4 wheels.)

    It's simple. There are idiots who makes them, and there are idiots who buy them. There are a lot of fuel saving gadgets found on ebay (Fuel heater, fuel magnet). Are they useful? Of course not. There are people buying them and putting them in their cars thinking it will work for them. I will never cover my wheels with anything other than wheel/rim cleaner. The only time they are covered is if they are in storage or if I am painting the brake caliper.

    I strongly disagree with the above comment. There are a lot of car companies spending lots of hours and R & D to put together a car to meet their customers' need; however, I can name a few automakers that when their name is mentioned the owners will agree with you that the cars they put together were put together with the lowest cost parts they can get away with.
     
  4. PaleMelanesian

    PaleMelanesian Beat the System Staff Member

    Hypermilers strive to DWB - drive as if they don't have brakes. That means anticipating so far ahead that you're just rolling up to a stop instead of bearing down on the brakes. There's MUCH less need for brake cooling this way.
     
  5. JusBringIt

    JusBringIt Be Inspired

    so we not only save on gas, we save on brake pads, rotors, tires, engine wear....i expect some high mileage cars afew years from now ;). and they say hypermiling is bad...
     
  6. Xringer

    Xringer Older Member

    Finally someone brings up a critical point. I agree with you 100% on this one. This is especially true for the disc brakes on the front wheel. Why do you think performance cars have brake ducks and vented front discs for?

    That's nice for race cars, but I'll always be driving in the real world along with 99.9% of everyone else..
    So vented discs on a commuter/family car is one of scams isn't it?


    There are a lot of warnings that are not mentioned in the car's manual. (e.g., make sure you don't fart in the car with the windows closed or else you will have to bear with the foul smell until the ventilation clears up the smell.) A lot of these are common sense but requires some baic knowledge about cars. Problems usually arise when people without basic understanding of cars believes their small inventions can provide instant satisfaction. (e.g., a driver decides it will be smart to cut their springs of the car in order to bring them closer to the ground. The minimum steps one needs to follow in order to properly lower a car is to replace the spring, shock, and properly realign all 4 wheels.)

    smelly cars?? Let's try to stay on topic here.. We are talking about Hubcaps..

    It's simple. There are idiots who makes them, and there are idiots who buy them. There are a lot of fuel saving gadgets found on ebay (Fuel heater, fuel magnet). Are they useful? Of course not. There are people buying them and putting them in their cars thinking it will work for them.

    You seem to be saying (in a round about way) that people who manufacture or install disc hubcaps are idiots.?.
    How about people who install grill blocks? Are they idiots too? Or, do you prefer to call them other demeaning names?


    I will never cover my wheels with anything other than wheel/rim cleaner. The only time they are covered is if they are in storage or if I am painting the brake caliper.

    Ah Ha! I certainly hope you are using a heat dissipating paint on those calipers.. :p
    (no really, how many normal people paint their calipers?)
    :rolleyes:



    I strongly disagree with the above comment. There are a lot of car companies spending lots of hours and R & D to put together a car to meet their customers' need; however, I can name a few automakers that when their name is mentioned the owners will agree with you that the cars they put together were put together with the lowest cost parts they can get away with.


    Well, you can disagree all you want.. But, automakers are in the business to make money.
    Their bottom line is their most important product.

    Some of the most innovative automakers that I've seen is Toyota & Honda. They can
    actually plan and carry out the whole idea-design-build-sell process and make some money,
    while providing us with some pretty good quality cars..

    Whereas most of the other companies seem to be 95% controlled by their marketing departments.
    My guess, they make the ad videos, screen them on a test audience, before they even
    give the job to their design departments.
     
  7. JusBringIt

    JusBringIt Be Inspired

    Now now, no need to get personal everyone, stress free zone here. ;)

    we all have our opinions but no one can deny the facts. We definitely don't want our privileges restricted because of something that had nothing to do with getting exceptional gas mileage.

    that said, everyone, we're all fighting on the same home team. Focus!...well..I think that should be changed to...Prius!! :D o well i guess i tried. laters!
     
  8. some_other_dave

    some_other_dave Well-Known Member

    I can only think of a few circumstances where the thermal load on the brakes would be great enough to cause a problem, even with air flow over the rotors severely restricted.

    One is racing. You really use your brakes hard when road-racing (that is, on one of the Big Tracks like Roebling Road, Watkins Glen, Laguna Seca, etc.). Frankly, I consider that to be abuse of the brakes--but normal for the track. Road racers replace their brake rotors very regularly, and their pads very frequently. Air ducting, scoops, and even "wheel fans" can keep the brakes working longer under that kind of abuse. (And some rally cars even have liquid cooling for their calipers, neat stuff!)

    The other is driving in the mountains. If you are descending a lot of altitude rapidly, and do not have significant level or uphill stretches relatively frequently, you can sometimes build up more heat than your rotors can easily shed. But in general, you have to be going fairly quickly and riding your brakes the whole way.

    Most of us do not drive in those circumstances. Hypermilers avoid that even more; we try to drive as if we had no brakes at all, right? (DWB.) So we would be in less need of those efforts than normal drivers, who don't actually need the ducting and scoops and such.

    I disagree that covering the openings in the wheels will block enough cooling air to make any real difference. If you look at older steel wheels, you'll see very little in the way of openings. Even many modern steel wheels have fairly little total hole area--they aren't flowing much air through them, and air can and does flow over the rotors and calipers from the inboard side.

    I personally would think twice before covering both the inside and outside of the wheel, as that would definitely trap air around the rotor and caliper, but just covering the outboard surface wheel should not have a really huge effect.

    Finally, remember that heat build-up is not something that occurs in one panic stop. Some heat will go into the brakes, true, but as long as you're not doing the rough equivalent of panic stops every 60 seconds, or every 5 or so minutes while dragging your brakes the whole time in between, you are very very very very unlikely to approach the heat sink capacity of your brakes, particularly with the heat that they shed into the air that moves across the back of the rotor.

    -soD
     

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