What is CGI block?
Compacted graphite iron (CGI), also known as vermicular graphite iron (GJV, VG, JV or GGV from the German: “Gusseisen mit Vermiculargraphit”) especially in non-English speaking countries, is a metal which is gaining popularity in applications that require either greater strength, or lower weight than cast iron.
What are Ford engine blocks made of?
Engineers cleverly designed what Ford calls a two-piece block with the iron sandwiched between aluminum heads and a thick die-cast-aluminum “ladder frame.” The oil pan is molded plastic. No cylinder liners or expensive bore-surface treatments are needed inside the strong CGI, a significant cost savings.
Is compacted graphite iron stronger than cast iron?
Compacted graphite iron has 80 percent more tensile strength, 40 percent more stiffness and double the fatigue strength of regular cast iron. Audi will use compacted graphite iron for all of its V-configuration engines, said Richard Bauder, head of Audi’s diesel engine development at Neckarsulm, Germany.
What is compacted graphite cast iron used for?
Compacted Graphite Iron has been increasingly accepted as automotive manufacturing material, showing its efficiency for several components, as brake discs and brake drums, exhaust manifolds, engine heads and diesel engine blocks, traditionally manufactured from gray cast iron (Guesser and Guedes, 1977).
Is pig iron obtained from cast iron?
Hint: In the process of extraction of pure iron, from ores, cast iron is obtained from pig iron. The less pure form of the iron among these two is malleable. The iron obtained from blast furnaces has more carbon content than other types of iron mentioned in the question.
How is compacted graphite iron made?
Similar to ductile iron, compacted graphite iron is produced by adding magnesium to a desulfurized base iron. As shown in Figure 3, CGI is stable over a range of approximately 0.008% magnesium (Mg), which is approximately five times smaller than the commercially used Mg-range for ductile iron.
What is the best engine block material?
Engine blocks are normally cast from either a cast iron or an aluminium alloy. The aluminium block is much lighter in weight, and has better heat transfer to the coolant, but iron blocks retain some advantages such as durability and better clearances from heat expansion.
How do you know if you have a cracked engine block?
Telltale Signs of a Cracked Engine Block
- Poor engine performance caused by low engine compression;
- Visible engine smoke;
- Engine overheating caused by leaking antifreeze;
- Discoloration in a car’s oil or antifreeze;
- Leaking oil or coolant;
- Frozen coolant in the radiator;
- Excessive smoke from the exhaust; and.
What is CGI cast iron?
Compacted Graphite Iron, which is also known as CGI or Vermicular Graphite Iron, is a form of cast iron in which the shape of the graphite particles is between that of conventional grey iron flakes and ductile iron where the graphite is in spheres.
Can I use cast iron for everything?
Cast-iron heats and cooks your food evenly, you can use it in the oven or on the stove, and, if it’s properly seasoned, it works just as well (if not better) than a cheap, non-stick skillet. There are special ways to cook with, clean, and store it, and if you know what you’re doing, it can last your whole life.
Is pig iron stronger than cast iron?
(D) Cast iron is soft and malleable while pig iron is extremely hard and brittle. – Cast iron is the iron obtained by melting of the mixture of pig iron and scrap iron and coke by hot air blast. It has around 3% of carbon content. So, it is more pure than pig iron.
Which is the closest to the purest form of the iron?
Wrought iron is the purest form of iron. It contains 0.12 to 0.25% carbon and is thus the purest form of iron.
When did Ford start using CGI in diesel?
Ford has been a leader in using CGI in high-volume diesel applications for more than 10 years, starting with the introduction of Jaguar’s 2.7L V-6 diesel in Europe in 2003, back when Ford owned Jaguar. More recently, Ford used CGI for the block of its 6.7L V-8 Power Stroke diesel introduced in 2010 in the F-Series Super Duty pickup.
Which is lighter a CGI block or aluminum block?
General Motors’ Opel subsidiary has used CGI for the engine block of its 2.5-liter V6 DTM racing engine. Theoretically, a CGI engine block can be fabricated lighter than an aluminum block for equal power densities. A recent 500cc Suzuki Grand Prix motorcycle engine had a crankcase fabricated from CGI.
How much does a CGI 12L diesel engine weigh?
Diesel truck engines are about six times heavier than equal displacement gasoline engines, so the potential for total weight reduction is even greater. A CGI 12L engine block weighs about 660 pounds and the head weighs about 275 pounds, making for a total of 935 pounds; this is a nearly 160 pound reduction.
Why is CGI used in high speed trains?
CGI also excels in thermal conductivity and internal-damping characteristics. The intrinsic damping helps minimize engine noise and vibration. When European high-speed trains suffered brake-rotor heat-checking and cracking, CGI saved the day. It’s the material of choice for exhaust manifolds, turbocharger housings, and flywheels.