Jake brake'd intrepid - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 37 (permalink) Old 10-18-2006, 09:19 AM Thread Starter
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Jake brake'd intrepid

Wasn't sure where this should go so I just put it in here. So I'm driving and my buddy was like get it up to like 5k rpm and I'm gonna turn the car off and when I do hold the gas pedal down. So I did, It sounds like a jake brake if you do that. I guess it is jsut that you can hear the valves opening and stuff with the throttle open. Is that good for the car? Just thought it was kinds cool.
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post #2 of 37 (permalink) Old 10-18-2006, 09:26 AM
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why the hell would you do that?
that could potentially be one of the most idiotic things i have ever heard!
congrats!
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post #3 of 37 (permalink) Old 10-18-2006, 09:36 AM Thread Starter
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Lol it wasn't my idea. I guess he figured it out or something. I haven't done it since.
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post #4 of 37 (permalink) Old 10-18-2006, 09:40 AM
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im sure it cant be good for your car.
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post #5 of 37 (permalink) Old 10-18-2006, 10:04 AM Thread Starter
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I don't doubt it
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post #6 of 37 (permalink) Old 10-18-2006, 10:04 AM
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Yeah, I think you should go do that a few more times, right now!!!
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post #7 of 37 (permalink) Old 10-18-2006, 11:08 AM
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i think his name says it all..................
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post #8 of 37 (permalink) Old 10-18-2006, 11:52 AM Thread Starter
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Firstly, it wasn't my idea. I had no clue what the hell he was doing. Secondly, I haven't done it since cause I don't wanna fuck up my car.
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post #9 of 37 (permalink) Old 10-18-2006, 11:54 AM
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why the hell would anyone want to do this???

THis is almost as dumb as one of our friends who goes out on the highway and keeps the car in 3rd gear red lining to "clean" the cylinders.

Some people need a good smack over the head. But it is your car afterall so as you wish, i just hope u dont do this to someone elses car.

BTW im not sure why it would be bad for the car, but certainly the instant drop from 5000rpm could damage some valves and even jump timing if the belt is bad enough.

I wouldnt try it again if i were u, ive never even had my car to 5k, let alone stop it at 5k.

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post #10 of 37 (permalink) Old 10-18-2006, 11:57 AM
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Quote:
Originally Posted by spaz_boy31
Wasn't sure where this should go so I just put it in here. So I'm driving and my buddy was like get it up to like 5k rpm and I'm gonna turn the car off and when I do hold the gas pedal down. So I did, It sounds like a jake brake if you do that. I guess it is jsut that you can hear the valves opening and stuff with the throttle open. Is that good for the car? Just thought it was kinds cool.
STAMPED.
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post #11 of 37 (permalink) Old 10-18-2006, 12:02 PM Thread Starter
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We did it once. I haven't done it again since, and don't intend on doing it again.
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post #12 of 37 (permalink) Old 10-18-2006, 01:01 PM
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Maybe I'm stupid here.....but what exactly is a jake brake?
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post #13 of 37 (permalink) Old 10-18-2006, 01:37 PM
 
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Because I want to join the thrashing...

If I told you to jump off a bridge, would you do it? I mean it wouldn't be your idea either so I guess you would do it.

Also, it is only good to the engine if you do that during cold startup. So wait until it gets below freezing before you try that again.
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post #14 of 37 (permalink) Old 10-18-2006, 01:54 PM
 
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Couldn't resist...
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.
Didn't the steering lock,too?
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post #15 of 37 (permalink) Old 10-18-2006, 02:02 PM
 
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Quote:
Originally Posted by spaz_boy31
We did it once. I haven't done it again since, and don't intend on doing it again.
Similiarlly,a friend and I took a non-aerobatic rated Cesna and did a REAL sloppy "loop" at 5,000agl to see if we could! (more of an inverted stall, but still a rush!!)
After finding out that there are only four bolts holding on the empannage-horizontal and vertical stabilizers- we never did that again!
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