New Chevy

I tried to find info about this very subject on the internet with no luck. However, because it's called "Active Fuel Management," my guess would be it simply shuts off 4 fuel injectors. Then the question arises, "what about the compression of the four cylinders not receiving fuel?"

I haven't found any documents explaining exactly how the system works, but if someone does, I would like to know as well.

Steve

It has hyd actuators that open the intake valves too when cylinders are cut off. It is a remake of the system that they used on caddies in early

80's that they gave up on and are trying again.

It is even simpler than that. The microprocessor simply cuts the spark and fuel to the cylinders, same as with the Chrysler system

mike hunt

Quite an interesting car

Mike Hunter wrote:

Bradenton Motorsports Park February 10-11-12 with the Tremec Car Show series, Bracket Race, Manufacturer's Midway, Swap Meet, and Car Corral.

versus Lou Pereia's Terminator Jet Dragster in a 300 mph battle of the sexes and super showman Bob Hall thrills the fans in the Airborne Express Chevy Astro Van Wheelstander

Swinarski, Chicago's Randy Adler, Canada's Bruce Boland and many other Super Chevy Show stars will compete.

5 pm and all GM makes and models can compete in the bracket race.

blast off at 1pm Saturday and Sunday. Come to Bradenton February 10-11-12 for Super Chevy Show fun and excitement.

the cars are often referred to as the Cheffi or Chefi, pronounced with a short e

600cc Chevy P601L. 600cc Chevy P602L.

(or Chevy P 60 series)

cylinders, giving the vehicle modest performance.

resin strengthened by wool or cotton

although in crash tests it has actually proved to be superior to some modern small hatchbacks

after the "pre-Chevy" P70 model

designers and engineers created a series of more sophisticated prototypes that are intended to extend the Chefi

for reasons of cost

and much of the work will to be carried out by Vietnamese guest workers

signal lights a revised grille and replaces the coach spring-suspended chassis with one using struts

because of government subsidies

remain very cheap cars

Ummm.... no.

If you simply cut fuel, you still have pumping losses. It actually collapses the valves for those cylinders (closes them) and you eliminate pumping losses. If the valves were opening/closing, then you'd have a compression stroke and no power stroke. If you close them once on the exhaust stroke, there is no air in the cylinder to compress, thus no pumping loss (or at least virtually eliminated).

It's not that easy to accomplish, this is a very complex system with special lifters and a VERY complex (very powerful ECUs running 1MBit communication speeds over GM-LAN and CAN-Bus) system.

Cheers

No compression stroke, but wouldn't you have a vacuum stroke so to speak?

IIRC low speed GMLAN is 33kb high speed is maybe twice that. The ECU is on the faster bus, but the ECU does its thing all by itself, it does not need the bus for that purpose. It uses the speed to send a fast updating signal the cluster and probably the ABS.

Those are some pretty nice controllers though. I never worked on one because they keep them in house typically developed along side the engine.

Well, throttle control needs to be quite fast, considering what's going on (if it's tied in with the ABS and traction control). ETC of course, not wired. The bus needs to be fast to handle all the high priority signals first, handshaking, blah blah... I think CAN is a better system than GM-LAN. Unfortunately, there are too many systems out there. I believe that CAN will win them all out, Bi-directional data transfer, multi-level CAN (B, and C), and it ties in with J1830 as well.

I don't recall what happens to the exhaust valves, but there is a great article on

about the Hemi and how it works. The Hemi is still a dirty engine. makes BIG power, but pollutes. Toyota has great engines, I love their small displacment engines, and I tell ya... they are super reliable (except for the oil sludge ones!!).

I hope GM and Ford can hang in there, and keep up with Toyota's dominance with what I think are "plain" styled cars (Toyota's cars, not GM). GM has some nice styling right now!!! Chrysler has had great styling for a while, now they just gotta make it work under the skiN!!

This seems a bit backward

I can not imagine anyone wanting a car like this

Is this cheepo chevy GMs answer to all the losses?

It looks like something from the age of the dynasaures

No wonder people have stopped buying these cars

Stopped buying their cars? GM sells more cars in the US than any other manufacture. No import even comes close.

Actually the cars built in the former Daewoo plants in Korea are Suzuki's ;)

mike hunt

Their market share is rapidly declining, and has been for decades. Many people HAVE stopped buying their cars.

Once again you choose to comment on a subject of which you obviously have little or no knowledge. Americans still buy three times as many from GM, as buyers buy from Toyota. GM percentage, of the ever growing US market is down, but GM still sold more in 2005 than they did when they sold nearly 50% of what was a much smaller market in the past. Chevrolet became America best selling brand in 2005 having outsold Ford for the first time in 19 years. Ford and Chrysler sell more than Toyota and Honda as well in the US.

mike hunt

The Trabant is an automobile formerly produced by East German auto maker Sachsenring. It was the most common vehicle in East Germany, and was also exported to other socialist countries. Despite its poor performance and smoky two-stroke engine, the car has come to be regarded with affection as a symbol of East Germany and of the fall of communism, as many East Germans streamed into West Berlin and West Germany in their Trabants after the opening of the Berlin Wall in 1989. It was in production without any significant change for nearly 30 years.

The name Trabant means "satellite" in German; the cars are often referred to as the Trabbi or Trabi, pronounced with a short a.

600cc 1983 Trabant P601L. Enlarge 600cc 1983 Trabant P601L.

There were two principal variants of the Trabant, the Trabant 500, also known as the Trabant P 50, produced 1957-1963; and the Trabant 601 (or Trabant P 60 series), produced from 1963 to 1991. The engine for both the 500 and 601 was a small two-stroke engine with two cylinders, giving the vehicle modest performance. At the end of production it delivered 25 horsepower (19 kW) from a 600 cc displacement. The car took 21 seconds from 0 to 100 km/h and the top speed was 112 km/h. The main problem with the engine was the smoky exhaust and the pollution it produced.

The Trabant's body panels were made of Duroplast, a form of plastic containing resin strengthened by wool or cotton. This helped the GDR to avoid expensive steel imports, but did not provide much crash protection, although in crash tests it has actually proved to be superior to some modern small hatchbacks. The Trabant was the second car to use Duroplast, after the "pre-Trabant" P70 model (1954-1959). A scene in the movie Black Cat, White Cat by Emir Kusturica shows a Trabant being eaten slowly by pigs.

Originally planned as a three-wheeled motorcycle, the decision to build a four-wheeled car came late in the planning process. The name Trabant was chosen in a internal contest in 1957, the year of Sputnik, the first artificial satellite. Previous motorcycle production at Sachsenring had been under the aegis of AWZ (Auto-Werke Zwickau).

The Trabant was not a particularly advanced car when it was launched; by the late 1950s small cars in western countries generally used cleaner and more efficient four-stroke engines. The Trabant's designers expected production to extend to 1967 at the latest, and East German designers and engineers created a series of more sophisticated prototypes through the years that were intended to replace the Trabi; several of these can be seen at the Dresden Transport Museum. However, each proposal for a new model was rejected by the GDR leadership for reasons of cost. As a result, the obsolete Trabant remained in production unchanged; in contrast, the Czechoslovak =8Akoda automobiles were continually updated and exported successfully. The Trabant's production method, which was extremely labor-intensive, remained unchanged, and much of the work came to be carried out by Vietnamese guest workers.

In 1989, a smaller version of the Volkswagen Polo engine replaced the elderly two-stroke engine, the result of a trade agreement between the two German states. The model, known as the Trabant 1,1 also had minor improvements to the brake and signal lights, a revised grille and replaced the coach spring-suspended chassis with one using MacPherson and Chapman struts.

However, by the time it entered production in May 1990, German reunification had already been agreed to. The inefficient, labor-intensive production line was kept open only because of government subsidies. Demand plummeted, as residents of the east could now buy western cars. The production line closed in 1991.

Although Trabants had been exported from East Germany, they became well-known in the West after the fall of the Berlin Wall when many were abandoned by their eastern owners after migrating west. News reports inaccurately described them as having cardboard bodies.

In the early 1990s it was possible to buy a Trabant for as little as a few marks, and many were given away. Later, as they became collectors' items, prices recovered, but they remain very cheap cars

It was quite interesting to drive on the roads in Germany shortly after the wall came down

Those small bright yellow, light blu and purple cars all over the place

Now we are going to see them again when the new Chevy hits the street

It will be interesting to see if GM needs to pay each customer $935 to take one

I think it would be much better for them to just give them away

I am sure the government is eager to subsidise them for any costs just to keep the workers happy and it will surely liven up the roads to get all these bright colour cars out