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    Thread: Go ahead...ask those car questions you were always afraid to ask...

    1. Social Media Iron Man(and Administrator) jebglx's Avatar
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      10-07-2005 10:33 AM #1
      b/c you'd think people would make fun of you.
      driving on a small 2 lane hwy the other day when i approached a small town. there was a big sign that said Brake Retardation Prohibited
      brake retardation? what does that mean???
      bill

    2. Member arozanski's Avatar
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      10-07-2005 10:35 AM #2
      Do you really not know, or are you being silly?
      Brake Retardation = No Jake Brakes, although they could have come up with a better sign. Suprised they are not being sued for emotional distress by the ADA (Autos with Disabilties Association)
      2009 KLR 650, 2006 KLR 650 (road kill edition), 1986 Gold Wing 1200, 1981 Dnepr, 1979 KZ1000, 1979 Royal Enfield Bullet 350

      1995 Sable - The BattleWagon

    3. 10-07-2005 10:36 AM #3
      If you had the manufacturing/fabricating means available, could you put a turbo on any engine? Say, a 22RE? And I mean a big turbo, like something off a tractor trailer.

    4. Member enriquejcu's Avatar
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      10-07-2005 10:36 AM #4
      here's one:
      Do they really need to post "No Passing" signs on roads with a double yellow center line?

    5. Member axe's Avatar
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      10-07-2005 10:37 AM #5
      Why did the steering wheel replace the Tiller in early cars?
      █ ♣ █ + | Sunlight on chrome, the blur of the landscape... every nerve aware

    6. Social Media Iron Man(and Administrator) jebglx's Avatar
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      10-07-2005 10:42 AM #6
      uh...jake brakes ?
      i really don't know
      bill

    7. Member texture's Avatar
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      10-07-2005 10:44 AM #7
      Quote, originally posted by jebglx »
      uh...jake brakes ?
      i really don't know
      bill

      what the heck are jake brakes???

    8. Moderator Harv's Avatar
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      10-07-2005 10:45 AM #8
      Quote, originally posted by jebglx »
      i really don't know


      highlight ^^^^

    9. Member GTI 20v's Avatar
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      10-07-2005 10:47 AM #9
      Quote, originally posted by texture »
      what the heck are jake brakes???

      Remember the old fitness series Body by Jake (tm)? It's like that.

      -Nick
      Quote Originally Posted by DUBLUV401 View Post
      I am not here for grammer lesson's

    10. Old man yelling at cloud
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      10-07-2005 10:48 AM #10
      Quote, originally posted by jebglx »
      uh...jake brakes ?
      i really don't know
      bill

      Never fear, Mr. Cho: Google is your friend.
      Quote »
      The Jake Brake takes its name from the manufacturer who invented the most common implementation of the technology, the Jacobs Company.
      The Jake brake is an add-on engine brake for diesel engines. Big semi trailers, the 18 wheel trucks that move everything we use, can weigh as much as 80,000 pounds. Stopping them or slowing them down results in a great deal of wear on the brakes, which have to be replaced frequently. The Jake brake, as an engine system, causes no wear and tear and can help slow the truck before the wheel brakes need to be applied. Its primary use is on long downhill grades where the wheel brakes would otherwise have to be frequently pumped to keep the truck from gaining dangerous speed.
      When the driver presses a button in the cab to activate the device, two things happen. First, the switch excites the engine brakes' solenoids. By itself, this would help only a little but it is necessary for the second step. What happens inside of the engine goes roughly like this.
      As a four-stroke internal combustion engine, each piston in a diesel normally moves up and down twice in each cycle. For the nit-pickers out there, there are many two-stroke diesel trucks on the road as well. The process begins when the fuel and air valves are closed and the piston moves upward. This compresses the air in the cylinder to as much as 25 times atmospheric pressure. This is much higher compression than a gasoline engine (typically ten times atmospheric pressure) and results in the air getting very hot, about 900 degrees Fahrenheit. At this time fuel is sprayed into the superheated air which immediately begins burning. The second stroke, the power stroke, is the downward movement of the piston as fuel burns. The third stroke is an upward movement with the exhaust valve open to clear out the combustion products while the fourth stroke refills the cylinder with air.
      The Jake brake completely changes all this, redefining what the valves do as each piston moves up and down. With the fuel flow terminated, the upward moving first stroke still compresses the air to very high pressure. As we said above, this transfers mechanical energy into heat as the air becomes highly compressed. If nothing else were done, most of this energy would be recovered, except for frictional losses, as the cylinder moved back down and the compressed air expanded. The Jake brake, however, opens the exhaust valve just as the air reaches maximum compression, dumping all of that energy in an almost instantaneous explosive release. The result is a very effective slowing of the vehicle as mechanical energy is converted to heat and then dumped. The Jake brake effectively transforms the internal combustion engine into an air compressor.
      It has only one drawback: it is very noisy. You may have heard a semi use the Jake brake without realizing what it was. Sometimes when a truck is approaching a stop sign or stop light it suddenly emits a load roar, very much like a large lawnmower, for five or ten seconds. It is the noise that is causing many towns to ban the use of the Jake brake. Even though tests have shown the decibel level to be about as loud as a large lawnmower, at night or early morning the low frequencies seem to carry a long distance and are very noticeable.
      Because it extends the life of wheel brakes and saves money, trucking companies generally lobby against the bans and some towns are compromising by allowing the Jake brake to be used in daylight hours. Yet more and more signs, with the words Jake Brake and the international symbol for "banned", are certain to appear. Since the primary use of the Jake brake is to slow the truck on long downhill grades, the technology will continue to be widely adopted for use on the open road.

    11. 10-07-2005 10:50 AM #11
      Quote, originally posted by texture »
      what the heck are jake brakes???

      ok, I know *what* these are and generally how they work, but can someone post up some pics and a general tech description of the jake brake/engine brake? I've always wanted to understand how it worked - though apparently I'm too lazy to actually search it out.

    12. Member arozanski's Avatar
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      10-07-2005 10:56 AM #12
      Quote, originally posted by Vayhemar »
      If you had the manufacturing/fabricating means available, could you put a turbo on any engine? Say, a 22RE? And I mean a big turbo, like something off a tractor trailer.

      With enough time, money and skill, anything is possible.
      That setup would have horrible lag, however. How about a triple turbo setup for your 22RE, a small one for the low end, transition to a medium one for the midrange, then feed into a rig turbo for pure silliness
      2009 KLR 650, 2006 KLR 650 (road kill edition), 1986 Gold Wing 1200, 1981 Dnepr, 1979 KZ1000, 1979 Royal Enfield Bullet 350

      1995 Sable - The BattleWagon

    13. 10-07-2005 11:10 AM #13
      I could use a history lesson......
      Why do we have steering wheels on the left hand side/Europe, etc. has it on the right......(who decided to differ and for what reason)........

    14. Member Honda_Appliance's Avatar
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      10-07-2005 11:12 AM #14
      Jake brakes are only loud on trucks with modified exhaust systems.
      If you ever see a sign that says "no jake brakes" take a photo and send it to Jacobs. It's a copywrite infringement and they don't like their company getting a bad reputation.

    15. 10-07-2005 11:14 AM #15
      Quote, originally posted by AutobahnTDI »
      If you ever see a sign that says "no jake brakes" take a photo and send it to Jacobs. It's a copywrite infringement and they don't like their company getting a bad reputation.

      Most places just say something to the extent of "Use of engine brakes prohibited." I've never seen them use the actual term "Jake Brake" on a road sign.

    16. Member enriquejcu's Avatar
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      10-07-2005 11:14 AM #16
      Quote, originally posted by mister_g60 »
      Most places just say something to the extent of "Use of engine brakes prohibited." I've never seen them use the actual term "Jake Brake" on a road sign.

      There was one around my town, but it has been removed.

    17. Geriatric Member ATL_Av8r's Avatar
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      10-07-2005 11:15 AM #17
      Will this rash ever go away???
      Or did you mean automotive related questions?
      MemeGate 2012 - First Responder, post #2

      Quote Originally Posted by .skully.
      Mike, quote me in your signature

    18. Member Honda_Appliance's Avatar
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      10-07-2005 11:15 AM #18
      Quote, originally posted by mister_g60 »
      Most places just say something to the extent of "Use of engine brakes prohibited." I've never seen them use the actual term "Jake Brake" on a road sign.
      ]
      I've seen quite a few.

    19. 10-07-2005 11:17 AM #19
      Quote, originally posted by AutobahnTDI »
      I've seen quite a few.

      Ok ... most places in Virginia. Sheesh.

    20. Member JUSTINCASE1021's Avatar
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      10-07-2005 11:19 AM #20
      What in gods name is a HAZMAT and why cant you take it into a tunnel???
      OSD/NEK
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    21. Geriatric Member ATL_Av8r's Avatar
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      10-07-2005 11:20 AM #21
      Quote, originally posted by JUSTINCASE1021 »
      What in gods name is a HAZMAT and why cant you take it into a tunnel???

      HAZardous MATerial
      MemeGate 2012 - First Responder, post #2

      Quote Originally Posted by .skully.
      Mike, quote me in your signature

    22. Member enriquejcu's Avatar
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      10-07-2005 11:20 AM #22
      Quote, originally posted by JUSTINCASE1021 »
      What in gods name is a HAZMAT and why cant you take it into a tunnel???

      hazardous materials

    23. Member Honda_Appliance's Avatar
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      10-07-2005 11:21 AM #23
      Quote, originally posted by enriquejcu »
      hazardous materials

      Yup. Prohibited in tunnels because of the fire threat they pose.

    24. Member JUSTINCASE1021's Avatar
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      10-07-2005 11:25 AM #24
      Quote, originally posted by ATL_Av8r »
      HAZardous MATerial

      I knew that just testing you guys ....although me and my dad for a while when i was younger had no idea what it was....we thought the sign was talking about thosa luggage carriers on top of some cars
      OSD/NEK
      I make beats...the beats don't make me....

      Alexi DeRochambeau was my hero....R.I.P.

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      10-07-2005 11:28 AM #25
      Its not really a car question but i dont care, this has been driving me nuts:
      What does it mean when someone says 'bump' on a thread? They usually do it when someone is selling something but they do it at other times too which is keeping me from figuring it out from the context.
      Thanks a million
      Craig

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