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what is the difference between dual overhead camshaft and a single overhead camshaft? and which on is better? at http://dual2.com/feed
Buying a vehicle is your personal choice and a personal question as well so I leave that to you. DOHC stands for Dual OverHead Camshaft and SOHC is Single OverHead Camshafts. The camshaft actuates the intake and exhaust valves in an SI engine. In SOHC only one camshaft is used to control both the intake and exhaust valves and in DOHC two separate camshafts are used. One for the intake valves of all cylinders and the other for the exhaust valves. Camshafts control timing of the valve opening and closing.
Most likely a 4 cyl gas engine with 4 valves per cylinder (16V total) and 2 overhead camshafts. My 1996 2.4L Plymouth engine is such. The same engine in 2.0 L was usually a 2 valve/cylinder Single OverHead Camshaft (SOHC), mostly in Neons. As far as why it matters, a DOHC will give more torque at higher rpm than SOHC, due to better breathing. Max HP will occur at a higher rpm, so don’t be afraid to spin it up in lower gears when you need HP (floor it if automatic transmission), like when entering a freeway. Mine strangely is in a minivan.
Dual overhead camshaft (dohc) is better than single overhead camshaft (sohc) in applications that require higher rpm operation of the petrol engine for prolonged periods of time. At higher rpms the time needed to inject charge and scavenge flue/exhaust gasses is lesser and lesser. Imagine there is a room with 10 people and a window with 1.5m diameter. and another room with again 10 people but the window here is split into two windows of 0.60m as their respective diameters. if they are asked to vacate the room using the window. Which room would be empty earlier? obviously the room with two windows, though smaller but efficient. Consider trying to put those people back in their rooms through those windows again and again and again.. just like the ic engine cycle. Given ample time, read low rpms, both of these have comparable performance, infact dohc is more complex and costly to build, but when rpms are higher, consistently, like racing applications, dohc beats sohc 10-0. Better efficiency and hence power.
A camshaft in an internal combustion engine makes it possible for the engine's valves to open and close., The camshaft is a cylinder that aligns with the engine's cylinders. The asymmetrical lobes of the camshaft correspond to the engine's valves. As the camshaft rotates, it opens and closes the engine's valves. The camshaft is connected to the engine's crankshaft by the timing belt. The timing belt and the camshaft work together to open the valves in coordination with the stroking of the pistons. Timing belts must be checked and adjusted regularly. When a timing belt breaks, the camshaft stops spinning. When this occurs, pistons can strike a valve while it is closed, functionally destroying the engine. Camshafts typically have variable speeds that shift as the speed of the engine changes. Most modern vehicles have dual overhead camshafts, with one camshaft assigned to the exhaust valves and a second to the intake valves. Typically, V-6 and V-8 engines have dual overhead camshafts, while smaller inline 4- or 6-cylinder engines have a single overhead camshaft. Dual camshafts make it possible to have more valves in the engine, which increases the flow of both intake and exhaust gases. This increased flow increases the engine's power.
SOHC - single over head cam DOHC - double over head cam A precise explanation of the two is given below. SOHC- SOHC refers to Single Overhead Camshaft. In the days before DOHC, it was known as OHC, with no need to differentiate between a single or double camshaft. In SOHC, the camshaft is situated in the cylinder head, above the valves. The valves are opened and closed either directly with a shim between the cam lobe and the valve stem, or via a rocker arm. SOHC engine valve configurations typically have 2 or 3 valves per cylinder. It is also possible to have 4 valves per cylinder using SOHC but this translates into a complicated combination of rocker arms and cam lobe shapes. 2. DOHC- DOHC refers to Double Overhead Camshaft. This arrangement uses two camshafts in each cylinder head. Two cams per cylinder head means that a DOHC V engine has 4 camshafts because it has 2 banks of cylinder heads. This allows the manufacturer to easily implement a 4 valve per cylinder setup. Most of the time it also allows the engine to rev higher. It also allows better placement of the valves in an optimized setup that gives you maximum performance. But the disadvantage of such a setup is more weight, more cost and more complexity. It takes more stuff to drive two camshafts. The main reason to use DOHC is to drive more valves per cylinder. SOHC has better low-end power, DOHC has better high-end power and overall maximum power. [picture courtesy- samarins.com]
Pros: less components mean less things that can break and smaller dimension Cons: since there is only one intake valve and one exhaust valve, air and combustion product flow is restricted and performance suffers
This automobile has a 5 door hatchback body style with a front mounted engine supplying power to the front wheels. Its engine is a naturally aspirated petrol, 0.8 litre, single overhead camshaft 3 cylinder with 2 valves per cylinder. In this application it has an output of 36 bhp (36.5 PS/26.8 kW) of power at 5000 rpm, and maximum torque of 59 N·m (44 lb·ft/6 kgm) at 2500 rpm. The engine delivers its power through to the wheels via a 4 speed manual 'box. Claimed kerb weight is 650 kg. Bore, ,×, ,Stroke, -68.5 × 72 mm and 2.7 × 2.83 in Bore/stroke ratio, -,0.95, (Approx)
The main difference between Duke 390 and Dominar 400 is Duke has DOHC( Dual overhead camshaft) configuration engine and Dominar has SOHC (single overhead camshaft), although they share same engines. DOHC is more focused towards acceleration and top speed. SOHC is more focused on mileage and touring capabilities as it generates less heat when compared to DOHC configuration in Duke 390. Duke 390 gives mileage on an average of 20–25 kmpl whereas Dominar 400 gives around 25–30 kmpl Thanks
The three basic camshaft arrangements are: single overhead camshaft (SOHC), double overhead camshaft (DOHC) and overhead valve (OHV) camshafts. Single overhead camshafts (SOHC) A single camshaft is located on the top of the Cylinder-Head and driven by the toothed belt and toothed pulley, or by a chain and sprocket. I camshaft in figure is driven by toothed belt. It has five journals which support it on top of the Cylinder-Head and cams to operate the valves. Double overhead camshafts (DOHC) Two camshafts (DOHC) are used in many engines. Each cylinder of a DOHC engine has four valves –two intake and two exhaust valves. One camshaft is used for the intake valves and the other for exhaust valves. Cylinder-head with two camshafts is shown in figure. These have toothed pulleys that are driven by the toothed belt. Witt v-type engines, two camshafts are used for each bank of cylinders, so the engine has four camshafts. This arrangement is sometimes referred to as quad-cam. Camshafts for overhead valves (OHV) In overhead-valve engines, a single camshaft is mounted in the cylinder block and valve lifters and push-rods on top of the cylinder-head. The arraignment for an in-line engine was shown princely in figure. With a v-type engine the camshaft is situated in the cylinder block directly above the crankshaft, as shown in figure. Camshaft is fitted with the sprocket that is driven by a short timing chain from a sprocket on the end of the crankshaft. In the assembly shown, the oil pump is driven directly by the crankshaft.
“What advantages do double overhead cam shaft or DOHC engines have over SOHC and OHC engines?” The advantages that Double Overhead Camshaft (DOHC) Engines have over Single Overhead Camshaft (SOHC) Engines are as follows: Greater horsepower per unit displacement versus the Single Overhead Camshaft counterpart, or even non Overhead Camshaft configurations, such as pushrod engines. Greater RPM (Revolutions Per Minute) potential is possible with a Double Overhead Camshaft configuration than ANY OTHER KNOWN CONFIGURATION of valvetrain operation. For instance, the Honda S-2000 had an RPM limit somewhere in the vicinity of 9000 RPM! Try that with any other valvetrain configuration and the end result will be an engine that blows due to excessive RPM! The Double Overhead Camshaft configuration has better “breathing” characteristics versus any other known valvetrain configuration!