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Subject: No Engine Braking [HiveMind] rss

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Rob
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30° 12′ 38″ N, 95° 45′ 2″ W
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I was driving through some small towns on the way home yesterday. In two or three of them I saw road warning signs: "No Engine Braking - by city ordinance." What does this mean? When I slow down, I have to use my brakes? I can't take my foot off the accelerator and coast? Any reason for this?
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Society of Watchers
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Killbuck
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Engine Braking or Jake Braking is when you downshift to a lower gear to slow down. Semis often do this. However, it is rather noisy for them and so many towns make it illegal to do it within town limits.
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Billy McBoatface
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It mean that trucks can't decelerate by putting the engine into low gear. This makes a lot of noise, and it is usually noise complaints that leads to those signs.

I engine brake all the time, even when I see those signs. My 1.6L engine makes so little noise when I engine brake that you'd have trouble hearing it from across the road.

Edit: Damn, ninja'd by less than a minute. ninja
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Mark Hamzy
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Round Rock
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Big trucks make a lot of noise if they downshift to a lower gear to slow down. Those signs are all around here also. Clearly they don't care about when I take a corner and downshift into second to get my RPMs above 4k... devil

I downshift into first in parking lots so that people can hear me if they seem to not be paying attention. Yes, pedestrians have right of way, but I want both sides to be aware of each other...
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Rob
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wmshub wrote:
I engine brake all the time, even when I see those signs.


You rebel.
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John James
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mileser wrote:
Engine Braking or Jake Braking is when you downshift to a lower gear to slow down. Semis often do this. However, it is rather noisy for them and so many towns make it illegal to do it within town limits.

Not exactly. Jake Brakes and Exhaust brakes effect the exhaust on a diesel cylinder head allowing some bypass or hindrance to slow the cranks rotation. Still the same noisy results.
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John James
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wmshub wrote:
I engine brake all the time, even when I see those signs. My 1.6L engine makes so little noise when I engine brake that you'd have trouble hearing it from across the road.

One thing to remember though, brakes are cheaper to replace than transmissions.
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Kevin Brown
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compression braking on diesel trucks doesn't necessarily involve downshifting, but the process of downshifting without throttle will engage the compression brake. They're always associated because they're done in unison to slow the truck without using the brakes as much.
Short version (it's obviously more complicated than this)is air in the cyclinder is allowed to escape the cyclinder head in order to bleed off energy in the system instead of transferring the energy back to the crankshaft. The released air is the noisy part of engine braking.
Excessive braking generates heat and brake fade and, with air brakes, loss of pressure in the air tank. Loss of pressure in the air tank will cause the brakes to lock up. Compression braking helps minimize this.

[edit: autocorrect had all sorts of issues!]
 
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Billy McBoatface
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Doomsword wrote:
wmshub wrote:
I engine brake all the time, even when I see those signs. My 1.6L engine makes so little noise when I engine brake that you'd have trouble hearing it from across the road.

One thing to remember though, brakes are cheaper to replace than transmissions.

When you are engine braking, the transmission is locked in gear, not getting any real wear at all. If you're already going fast when you throw it into low gear, yeah that'll be hard on the transmission, so generally you should use this on a long hill by first using the brakes to get close to the speed you want, then putting the engine into (low) gear and riding that the rest of the way down the hill. This saves both brakes and transmission.
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Josh
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Based upon my poor understanding of history, science, and ethics...
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To add 2 cents: Engine braking is not downshifting, as pointed out.

Engine braking is loud. Truck drivers are theoretically taught not to do it in residential areas.

It's about as loud as a hot rod with a big engine and an obnoxious muffler. BUT only for a few seconds, while the hot rod is obnoxious all the time.

Old ladies in little towns need something to bitch about, and out of town truckers are an easy target.
 
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Billy McBoatface
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Koldfoot wrote:
To add 2 cents: Engine braking is not downshifting, as pointed out.

H'mmm, if I read the wikipedia page properly, it is and it isn't. In a diesel engine, you can install a "jake brake" in the engine to let it act like a brake by opening up the exhaust valves at the right time. But then wikipedia says:
Quote:
Contrast a petrol engine, where the mechanics are different and a special valve is not necessary for engine braking to occur when the driver releases the accelerator. In a gasoline engine, when the accelerator is released, the throttle prevents the free flow of air into the cylinders, so there is little pressure to release at the top of the compression stroke. The closed throttle provides engine braking by forcing the engine to generate a vacuum between the throttle and the cylinders.

So if I read correctly, what I'm doing when I downshift and release the throttle *is* engine braking, but in a diesel engine they would need an extra mechanism and they don't necessarily have to downshift. (I don't really need to downshift either, but the lower the gear the harder the engine will brake, so usually I shift down to 2nd or 3rd when I want to do this).
 
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Based upon my poor understanding of history, science, and ethics...
United States
North Pole
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Truckers know that sign is directed at them. Cops know it too. That is what is important.

Downshift until your heart is content. That specific ordinance does not concern you unless you are driving something with more than 4 wheels.

It's like a sign that says "road closed. Local traffic only." Go ahead and visit grandma if she lives on the other side of the sign.
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Brendan Riley
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Koldfoot wrote:
Old ladies in little towns need something to bitch about, and out of town truckers are an easy target.


For a single trucker, the "no jake braking" sign seems annoying, "what harm does it do?" But for the person who lives near a spot where truckers are inclined to do that, it isn't one truck, it's many trucks, constantly.

Be nicer to the old ladies.
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Chris
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Sandy Springs
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Short, short version:this is for commercial trucks not you.
 
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