CONSTRUCTION AND USE OF V-12 ENGINE

This document is adapted from another PPT present in slide share.But this is little different from that one. In this presentation the mechanism of firing order is added.Hope you people like this. Thank you

1. CONSTRUCTION & USE OF V-12 ENGINE Submitted by-- Abcdefgh Abcdefgh Branch- Mechanical Section- A, Group-02 Reg No. - xxxxxxxxxxx

2. WHAT IS V-ENGINE A V-engine or Vee engine is a common configuration for an internal combustion engine where the cylinders and pistons are aligned, in two separate planes or 'banks', so that they appear to be in a "V" when viewed along the axis of the crankshaft. The Vee configuration generally reduces the overall engine length, height and weight compared with an equivalent inline configuration of an I.C Engine.

3. WHAT IS V-12 ENGINE A V -12 engine is a V engine with 12 cylinders mounted on the crankcase in two banks of six cylinders, usually but not always at a 60 ° angle to each other, with all 12 pistons driving a common crankshaft .

4. HISTORY OF V-12 ENGINE The first V12 engine was used in 1912 in Packard’s "Double Six", but before the World War II the engine was used in a lot of luxury cars: Cadillac, Packard, Lincoln, Franklin, Rolls-Royce, and Hispano-Suiza .

5. CONFIGURATION AND WORKING OF A V-12 ENGINE A V12 engine is a V engine with 12 cylinders mounted on the crankcase in two of six cylinders, usually but not always at a 60° angle to each other, with all 12 pistons driving a common crankshaft. A V12 with two banks of six cylinders angled at 60°, 120 ° (with the latter configuration usually referred to as a flat-12) from each other has even firing with power pulses delivered twice as often per revolution as a straight-6. In a racing car, the rotating parts can be made much lighter and thus more responsive, since there is no need to use counterweights on the crankshaft as is needed in a 90° V8 and less need for the inertial mass in a flywheel to smooth out the power delivery .

6. V V-12 V-12 V-12

7. WHAT IS THE TERM STRAIGHT-6 IN V-12 ENGINES - The straight-six engine or inline-six engine (often abbreviated I6 or L6) is an internal combustion engine with the cylinders mounted in a straight line along the crankcase with all the pistons driving a common crankshaft.. -The straight-six layout is the simplest engine layout that possesses both primary and secondary mechanical engine balance.

8. V-12 ENGINE DIAGRAM

9. V- 12 BY LAMBORGHINI

10. FIRING ORDER OF V-12 Lamborghini 1 st made the move to Formula One in 1989. The F1 vehicle used an engine of rating 3.5L V-12. The firing order of that engine was found to be 1–7–4–10–2–8–6–12–3–9–5–11. But in the latest flagship model of Lamborghini Aventador LP 700-4 the firing order was found to be 1–12–4–9–2–11–6–7–3–10–5–8. The main reason for choosing this order is to gain Maximum power output. Since when Aventador was released the V-12 engine is being upgraded continuously from a rating of 530 kW ; 710 hp to 566 kW ; 759 hp. There exists several other possible combination of piston in a firing order. The most common firing order used by Ferrari and heavy duty vehicles is 1-7-5-11-3-9-6-12-2-8-4-10 and 1-7-4-10-2-8-6-12-3-9-5-11. Some other combinations or order used in differnet vehicles are below 1-4-9-8-5-2-11-10-3-6-7-12 And 1-12-5-8-3-10-6-7-2-11-4-9.

11. FIRING ORDER OF V-12 1–12–4–9–2–11–6–7–3–10–5–8 L–R–L–R–L–R–L–R–L–R–L–R TYPE

12. FIRING ORDER OF V-12 1- 4- 9- 8- 5- 2- 11- 10- 3- 6- 7- 12 L-L-R-R-L-L-R-R-L-L-R-R TYPE

13. V12 engines are or were used in for the following purposes: They were once used in aviation industry For road cars In heavy trucks In Auto Racing In Large Diesel Engines Tanks and other AFVs ( Armoured fighting vehicles)

14. -The first V12 engines were used in aircraft. -By the end of World War I, V12s were popular in the newest and largest fighters and bombers and were produced by companies such as Renault and Sunbeam. -Various U.S. companies produced the Liberty L-12; the Curtiss NC Flying boats, including the four V12 engine poweredNC-4, the first aircraft to make a transatlantic flight.

15. -In automobiles, V12 engines have not been common due to their complexity and cost. -They are used almost exclusively in expensive sports cars and luxury cars as the power output of these engines are very high and the overall engine dimensions and weight are less compared to straight or inline engine.

16. -V12 engines used to be common in Formula One and endurance racing. From 1965 to 1980, Ferrari, Weslake, Honda, BRM, Maserati , Matra, Delahaye ,Peugeot , Delage , Alfa Romeo. -Lamborghini and Tecno used 12-cylinder engines in Formula One, either V12 or Flat-12, but the Ford (Cosworth) V8 had a slightly better power-to-weight ratio and less fuel consumption. -During thesame era, V12 engines were Superior to V8s in endurance racing, reduced vibrations giving better reliability.

17. -V12 is a common configuration for large diesel engines; most are available with differing numbers of cylinders in V configuration to offer a range of power ratings. Many diesel locomotives have V12 engines. -Large V12 engines are also common in ships. -These engines are commonly used especially in cruise ships, which may have up to six such main engines. In the past the largest medium-speed diesel engine in the world.

18. The worlds smallest V12 engine was developed by Spanish engineer Patelo spending more than 1200 hours transforming blocks of aluminium, bronze and stainless steel. Into the intricate pasts needed to build this amazing V12 engine. The tiny V12 engine is powered by compressed air which is injected into the engine at 0.1kg/sq cm.

19. ADVANTAGES AND DISADVANTAGES - Minimal Vibration: V12 engines are two straight-sixes matched to a common crank. This means they’re inherently balanced at any V angle . - Smooth Power Delivery: The V12 has a piston firing every 60 degrees of crankshaft rotation, giving it one of the smoothest power deliveries of any engine . - Free Revving: Because the engine is naturally balanced, the crankshaft can be made with minimal counterweight, reducing rotational inertia. Power: Small cylinders make high revs easier, and large displacement means more air and fuel. Both of these factors lead to big power numbers from V12 engines. ADVANTAGES-

20. ADVANTAGES AND DISADVANTAGES -Cost : As expected, this isn’t a cheap option. -Complexity : With 12 pistons, and often 48 valves, the number of moving parts lead to a complex engine. -Size : Be sure to provide plenty of space to package in a massive V12 in your engine bay. -Weight : It’s a big heavy engine. Of course, you can always spend more money on lighter materials. DISADVANTAGES-

21. ANIMATIONS A comparison between an inline 4-cylinder straight engine vs. a 12 cylinder V-engine

22. THANK YOU