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Car Forum / GMC Cars / January 2006New Chevy
I read where there is a new Chevy,that can reduce the number of cylinders used, when driving. Any idea,how it is done?? > I read where there is a new Chevy,that can reduce the number of > cylinders used, when driving. Any idea,how it is done?? 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 >>I read where there is a new Chevy,that can reduce the number of >>cylinders used, when driving. Any idea,how it is done?? [quoted text clipped - 8 lines] > > 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.  Signature----------------- www.thesnoman.com 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 >>>I read where there is a new Chevy,that can reduce the number of >>>cylinders used, when driving. Any idea,how it is done?? [quoted text clipped - 16 lines] > 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 I'm gonna research later, but I believe it would just about have to keep open a valve(s) to keep load off crank caused by providing a compression stroke. Else, I'll shut up and sit back down. s >> It is even simpler than that. The microprocessor simply cuts the spark >> and fuel to the cylinders, same as with the Chrysler system [quoted text clipped - 4 lines] > keep open a valve(s) to keep load off crank caused by providing a > compression stroke. Else, I'll shut up and sit back down. s OK, after a bit of googling, I found GM's 'Displacement on Demand' uses collapsible/telescoping lifters which allow them to absorb the once-solid drive from the cam thru the valves. Hence, during deactivation (4 of 8 available cylinders being used) every other piston in the firing order is deactivated--the fuel & spark are cut off and the valves stay CLOSED. Just prevents a compression stroke. Evidently, it takes a considerably small amount of energy to allow these pistons to move up & down inside the cylinder EVEN while the valves are closed. Did I promise to shut up and sit back down? HTH, s > >> It is even simpler than that. The microprocessor simply cuts the spark > >> and fuel to the cylinders, same as with the Chrysler system [quoted text clipped - 14 lines] > cylinder EVEN while the valves are closed. > Did I promise to shut up and sit back down? HTH, s Did you find this article? http://www.leftlanenews.com/2005/10/14/gm-eaton-team-up-for-displacement-on-demand/ I'm still not sure what's going to happen inside that engine. In your note, valves CLOSED, there will be compression and decompression on each stroke. The air in the cylinder can function like a spring, except for leakage and heat loss. In the description I found, open vs closed is not specified. Clearly, however, they're doing something a little tricky with the valves. By the way, this: http://www.edmunds.com/advice/specialreports/articles/100831/article.html mentions an all-aluminum engine. In a big behicle, like a Suburban, the weight savings will be no big deal. However, it will be interesting to see if this development moves down to smaller motors. I guess they've decided that after 30 years, the memory of the Vega has been lost. >>> It is even simpler than that. The microprocessor simply cuts the spark >>> and fuel to the cylinders, same as with the Chrysler system [quoted text clipped - 16 lines] > cylinder EVEN while the valves are closed. > Did I promise to shut up and sit back down? HTH, s This describes it pretty well http://www.popularhotrodding.com/enginemasters/articles/hardcore/0405sc_gmdod/ they say the reason it works now is the throttle by wire so the computer can adjust the throttle at the point it cuts the others in or out unlike the old days where you would feel it. Looks like it might not be too hard to retrofit to an existing engine. Maybe hook up a switch on the dash and label it turbo boost or something :) Quite an interesting car > It is even simpler than that. The microprocessor simply cuts the spark and > fuel to the cylinders, same as with the Chrysler system [quoted text clipped - 26 lines] > > ----------------- > > www.thesnoman.com> The 26th Annual tour of Super Chevy Shows starts at Bradenton Motorsports Park February 10-11-12 with the Tremec Car Show series, Bracket Race, Manufacturer's Midway, Swap Meet, and Car Corral. > Excitement galore as Jessie Harris in the Queen of Diamonds Jet Dragster 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 > The wildest machines in drag racing Nitro Coupes feauturing New York's Mike Swinarski, Chicago's Randy Adler, Canada's Bruce Boland and many other Super Chevy Show stars will compete. > Bracket racers will have the opportunity to Test & Tune on Friday from noon to 5 pm and all GM makes and models can compete in the bracket race. > Gates open Friday at 10 am, Saturday and Sunday at 8 am. Nitro Coupes and Jets blast off at 1pm Saturday and Sunday. Come to Bradenton February 10-11-12 for Super Chevy Show fun and excitement. > GM Performance Division continues sponsorship of > Super Chevy Shows > AutoStar Productions is proud to announce that GM Performance Division has > The new super Chevy is an automobile produced by GM > Despite its poor performance and smoky two-stroke engine the name Chevy means something the cars are often referred to as the Cheffi or Chefi, pronounced with a short e 600cc 1983 Chevy P601L. Enlargeg 600cc 1983 Chevy P601L. > Super Chevy, the Chevy 500, also known as the Chevy P 50, and the Chevy 601 (or Chevy P 60 series) > The engine for both the 500 and 601 is a small two-stroke engine with two cylinders, giving the vehicle modest performance. > It deliveres 25 horsepower (19 kW) from a 600 cc displacement. > The car takes 21 seconds from 0 to 100 km/h and the top speed is 112 km/h. > The main problem with the engine is the smoky exhaust and the pollution it produces > The Chevys body panels are made of Duroplast, a form of plastic containing resin strengthened by wool or cotton > This helps GM avoid expensive steel, but does not provide much crash protection although in crash tests it has actually proved to be superior to some modern small hatchbacks > The new super Chevy is the second car to use Duroplast, after the "pre-Chevy" P70 model > Originally planned as a three-wheeled motorcycle > The decision to build a four-wheeled car came late in the planning process > The name Chevy was chosen in a internal contest > Previous motorcycle production at Cadillac inspired this new Chefi > The Chevy is not a particularly advanced car > Later model will generally use cleaner and more efficient four-stroke engines > The Chevys designers expect production to extend to 2007 at the latest designers and engineers created a series of more sophisticated prototypes that are intended to extend the Chefi > Several of these can be seen at the super Chevy show > However, each proposal for a new model has been rejected by the leadership for reasons of cost > As a result, the Chevy remained in production unchanged > The automobiles will be continually updated and exported > The Chevys production method, which is extremely labor-intensive will remain unchanged and much of the work will to be carried out by Vietnamese guest workers > A smaller version of the engine replaces the elderly two-stroke engine > The model, known as the Chevy 1,1 also has minor improvements to the brake and signal lights a revised grille and replaces the coach spring-suspended chassis with one using struts > However the time it enters production has already been agreed to > The inefficient, labor-intensive production line will be kept open only because of government subsidies > Demand for GM cars has plummeted as residents can now buy Japanese cars > Chevys well-known in the News reports inaccurately describes them as having cardboard bodies > Buy a Chevy for as little as a few dollars, and many will be given away at the show > Later when as they become better liked prices will be increased but they will remain very cheap cars Quite an interesting car > It is even simpler than that. The microprocessor simply cuts the spark and > fuel to the cylinders, same as with the Chrysler system [quoted text clipped - 26 lines] > > ----------------- > > www.thesnoman.com> The 26th Annual tour of Super Chevy Shows starts at Bradenton Motorsports Park February 10-11-12 with the Tremec Car Show series, Bracket Race, Manufacturer's Midway, Swap Meet, and Car Corral. > Excitement galore as Jessie Harris in the Queen of Diamonds Jet Dragster 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 > The wildest machines in drag racing Nitro Coupes feauturing New York's Mike Swinarski, Chicago's Randy Adler, Canada's Bruce Boland and many other Super Chevy Show stars will compete. > Bracket racers will have the opportunity to Test & Tune on Friday from noon to 5 pm and all GM makes and models can compete in the bracket race. > Gates open Friday at 10 am, Saturday and Sunday at 8 am. Nitro Coupes and Jets blast off at 1pm Saturday and Sunday. Come to Bradenton February 10-11-12 for Super Chevy Show fun and excitement. > GM Performance Division continues sponsorship of > Super Chevy Shows > AutoStar Productions is proud to announce that GM Performance Division has > The new super Chevy is an automobile produced by GM > Despite its poor performance and smoky two-stroke engine the name Chevy means something the cars are often referred to as the Cheffi or Chefi, pronounced with a short e 600cc Chevy P601L. 600cc Chevy P602L. > Super Chevy, the Chevy 500, also known as the Chevy P 50, and the Chevy 601 (or Chevy P 60 series) > The engine for both the 500 and 601 is a small two-stroke engine with two cylinders, giving the vehicle modest performance. [quoted text clipped - 3 lines] > The Chevys body panels are made of Duroplast, a form of plastic containing resin strengthened by wool or cotton > This helps GM avoid expensive steel, but does not provide much crash protection although in crash tests it has actually proved to be superior to some modern small hatchbacks > The new super Chevy is the second car to use Duroplast, after the "pre-Chevy" P70 model > Originally planned as a three-wheeled motorcycle > The decision to build a four-wheeled car came late in the planning process [quoted text clipped - 3 lines] > Later model will generally use cleaner and more efficient four-stroke engines > The Chevys designers expect production to extend to 2007 at the latest designers and engineers created a series of more sophisticated prototypes that are intended to extend the Chefi > Several of these can be seen at the super Chevy show > However, each proposal for a new model has been rejected by the leadership for reasons of cost > As a result, the Chevy remained in production unchanged > The automobiles will be continually updated and exported > The Chevys production method, which is extremely labor-intensive will remain unchanged and much of the work will to be carried out by Vietnamese guest workers > A smaller version of the engine replaces the elderly two-stroke engine > The model, known as the Chevy 1,1 also has minor improvements to the brake and signal lights a revised grille and replaces the coach spring-suspended chassis with one using struts > However the time it enters production has already been agreed to > The inefficient, labor-intensive production line will be kept open only because of government subsidies > Demand for GM cars has plummeted as residents can now buy Japanese cars > Chevys well-known in the News reports inaccurately describes them as having cardboard bodies > Buy a Chevy for as little as a few dollars, and many will be given away at the show > Later when as they become better liked prices will be increased but they will remain very cheap cars > Quite an interesting car > [quoted text clipped - 113 lines] >> Later when as they become better liked prices will be increased but they >> will 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 >>Quite an interesting car >> [quoted text clipped - 136 lines] > exhaust stroke, there is no air in the cylinder to compress, thus no pumping > loss (or at least virtually eliminated). No compression stroke, but wouldn't you have a vacuum stroke so to speak? > 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. 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. SignatureThank you, CL Gilbert "Then said I, Wisdom [is] better than strength: nevertheless the poor man's wisdom [is] despised, and his words are not heard." Ecclesiastes 9:16 >>>Quite an interesting car >>> [quoted text clipped - 151 lines] > 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 www.allpar.com 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!! > >> news:1138050042.788547.236820@f14g2000cwb.googlegroups.com... > >> [quoted text clipped - 60 lines] > >>>>Despite its poor performance and smoky two-stroke engine the name Chevy > >>>>means something This seems a bit backward > >>>the cars are often referred to as the Cheffi or Chefi, pronounced with > >>>a short e [quoted text clipped - 115 lines] > some nice styling right now!!! Chrysler has had great styling for a while, > now they just gotta make it work under the skiN!! > M.R.S. wrote: > > "CL (dnoyeB) Gilbert" <Fake@ThisOneIsFake.com> wrote in message [quoted text clipped - 74 lines] > > >>>>Later when as they become better liked prices will be increased but they > > >>>>will remain very cheap cars 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. >> M.R.S. wrote: >> > "CL (dnoyeB) Gilbert" <Fake@ThisOneIsFake.com> wrote in message [quoted text clipped - 101 lines] > > No wonder people have stopped buying these cars They also sell lots of Daewooooooooossss. > Stopped buying their cars? GM sells more cars in the US than any other > manufacture. No import even comes close. [quoted text clipped - 104 lines] > > > > No wonder people have stopped buying these cars Actually the cars built in the former Daewoo plants in Korea are Suzuki's ;) mike hunt > They also sell lots of Daewooooooooossss. >> Stopped buying their cars? GM sells more cars in the US than any other [quoted text clipped - 115 lines] >> > >> > No wonder people have stopped buying these cars >Stopped buying their cars? GM sells more cars in the US than any other >manufacture. 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 >>Stopped buying their cars? GM sells more cars in the US than any other >>manufacture. > Bottom-posting troll DIZZY wrote > Their market share is rapidly declining, and has been for decades. > Many people HAVE stopped buying their cars. > Stopped buying their cars? GM sells more cars in the US than any other > manufacture. No import even comes close. [quoted text clipped - 9 lines] > >> > >>>>Chevy > >> > >>>>means something 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 cars are often referred to as the Cheffi or Chefi, pronounced > >> > >>>with > >> > >>>a short e > >> > >>>600cc Chevy P601L. > >> > >>>600cc Chevy P602L. 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. > >> > >>>>Super Chevy, the Chevy 500, also known as the Chevy P 50, and the > >> > >>>>Chevy [quoted text clipped - 9 lines] > >> > >>>>pollution > >> > >>>>it produces 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 Chevys body panels are made of Duroplast, a form of plastic > >> > >>>>containing resin strengthened by wool or cotton [quoted text clipped - 9 lines] > >> > >>> > >> > >>>after the "pre-Chevy" P70 model 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 [quoted text clipped - 5 lines] > >> > >>>>four-stroke > >> > >>>>engines 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 Chevys designers expect production to extend to 2007 at the > >> > >>>>latest [quoted text clipped - 14 lines] > >> > >>>and much of the work will to be carried out by Vietnamese guest > >> > >>>workers 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 koda 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. > >> > >>>>A smaller version of the engine replaces the elderly two-stroke > >> > >>>>engine [quoted text clipped - 5 lines] > >> > >>>with > >> > >>>one using struts 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 the time it enters production has already been agreed to > >> > >>>>The inefficient, labor-intensive production line will be kept open > >> > >>>>only > >> > >>>>because of government subsidies > >> > >>>>Demand for GM cars has plummeted as residents can now buy Japanese > >> > >>>>cars 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. > >> > >>>>Chevys well-known in the News reports inaccurately describes them > >> > >>> > >> > >>>as having cardboard bodies 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. > >> > >>>>Buy a Chevy for as little as a few dollars, and many will be given > >> > >>>>away > >> > >>>>at the show > >> > >>>>Later when as they become better liked prices will be increased but > >> > >>>>they > >> > >>>>will remain very cheap cars 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 > > I can not imagine anyone wanting a car like this > > [quoted text clipped - 3 lines] > > > > No wonder people have stopped buying these 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 > I read where there is a new Chevy,that can reduce the number of > cylinders used, when driving. Any idea,how it is done?? Everything old is new again. Who else remembers the Cadillac 4-6-8 engines of the 1980s? Cylinder deactivation is now becoming a relatively common technology. John |
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