Wholesale Auto Body Parts

HOME

car parts

TRUCK PARTS

SEARCH

QUALITY PARTS

SHIPPING

ABOUT US

QUOTES

CONTACT US

TRACKING

SITES

Auto Body Parts Online - Offering Aftermarket/Replacement Car & Truck Body Parts at Wholesale Price
Pay Your Your Parts Here!CHECKOUT / VIEW CART HERE
Auto Articles
Auto Parts
Air Filters
Alternator
Battery
Brake
Bumpers
CamShaft
Carburetor
Clutch
Connecting Rod
Crank Shaft
Cylindrical Head
Differential
Distrubutor
Door
Drive Shaft
Electronics Fuel Injection
Exhaust Gas Reciculation
Exhaust Pipe
Fuel Pump
Fuse
Gearbox
Headlights
Oilpump
Piston Ring
Piston
Rank and Pinion
Radiator
Rocketarm
Seat
Self Starter
Spark Plug
Speedmeter
Universal Join
Water Pump
 
Car Parts
Air Filters
Alternator
Battery
Brake
Bumpers
CamShaft
Carburetor
Clutch
Connecting Rod
Crank Shaft
Cylindrical Head
Differential
Distrubutor
Door
Drive Shaft
Electronics Fuel Injection
Exhaust Gas Reciculation
Exhaust Pipe
Fuel Pump
Fuse
Gearbox
Headlights
Oilpump
Piston Ring
Piston
Rank and Pinion
Radiator
Rocketarm
Seat
Self Starter
Spark Plug
Speedmeter
Universal Join
Water Pump
 
Truck Parts
Air Filters
Alternator
Battery
Brake
Bumpers
CamShaft
Carburetor
Clutch
Connecting Rod
Crank Shaft
Cylindrical Head
Differential
Distrubutor
Door
Drive Shaft
Electronics Fuel Injection
Exhaust Gas Reciculation
Exhaust Pipe
Fuel Pump
Fuse
Gearbox
Headlights
Oilpump
Piston Ring
Piston
Rank and Pinion
Radiator
Rocketarm
Seat
Self Starter
Spark Plug
Speedmeter
Universal Join
Water Pump
 
Body Parts
 
Headlights
Acura
Alfaromeo
Audi
BMW
Cadillac
Chevy
Chrysler
Dodge
Eagle
Ford
Geo
GMC
Honda
Hyndai
Infiniti
Isuzu
Jaguar
Jeep
Kai
Landrover
Lexus
Lincoln
Mazda
Mercedes
Mercury
Merkur
Mitsubishi
Nissan
Oldmobile
Plymouth
Pontiac
Saab
Subaru
Suzuki
Toyota
Volkswagen
Volvo
 
Taillights
Acura
Audi
BMW
Buick
Cadillac
Chevy
Chrysler
Geo
GMC
Honda
Infiniti
Isuzu
Jeep
Kai
Landrover
Lexus
Mazda
Mercedes
Mercury
Mitsubishi
Nissan
Oldmobile
Plymouth
Pontiac
Porsche
Saab
Saturn
Subaru
Suzuki
Toyota
Volkswagen
Volvo
 
Bumpers
Acura
Audi
BMW
Buick
Cadillac
Chevy
Chrysler
Dodge
Eagle
Ford
Geo
GMC
Honda
Hyndai
Infiniti
Isuzu
Jeep
Kai
Lexus
Lincoln
Mazda
Mercedes
Mercury
Mitsubishi
Nissan
Oldmobile
Plymouth
Pontiac
Renault
Saturn
Subaru
Suzuki
Toyota
Volkswagen
Volvo


Camshaft

The camshaft is an apparatus often used in piston engines of cars to operate poppet valves. It consists of a cylindrical rod running the length of the cylinder bank with a number of oblong lobes or cams protruding from it, one for each valve. The cams force the valves open by pressing on the valve, or on some intermediate mechanism, as they rotate.

Timing

The rotation of the camshaft and the rotation of the crankshaft is of critical importance. Since the valves control the flow of air/fuel mixture intake and exhaust gases, they must be opened and closed at the appropriate time during the stroke of the piston. For this some reason, the camshaft is connected to the crankshaft either directly, via a gear mechanism, or indirectly via a belt or chain called a timing belt or timing chain. Also on early fuel injection systems, cams on the camshaft would operate the fuel injectors.

In a other four-stroke engine case, the valves are opened only half as often; two full rotations of the crankshaft occur for each rotation of the camshaft. In a two-stroke engine that uses a camshaft as car parts, each valve is opened once for each rotation of the crankshaft; in these engines, the camshaft rotates at the same rate as the crankshaft.

Camshaft position

Depending on the different location of the camshaft, the cams operate the valves either directly or through a linkage of pushrods and rockers. Direct operation involves a simpler mechanism and leads to fewer failures in car parts, but requires the camshaft to be positioned at the top of the cylinders. In the past when engines were not as reliable as today this was seen as too much bother, but in modern gasoline engines with modern car parts the overhead cam system, where the camshaft is on top of the cylinder head, is quite common. Some engines use two camshafts each for the intake and exhaust valves; such an arrangement is known as a double or dual overhead cam (DOHC), thus, a V engine may have four camshafts.

Duration

Duration can often be confusing point because manufacturers may select any lift point to advertise a camshaft's duration and sometimes will manipulate these numbers. The power and idle characteristics of a camshaft rated at .006" will much different than one rated the same at .002". Whenever duration is quoted, be sure to note the lift at which it is given.
Many performance engine builders have learned to gauge a race profile's aggressiveness by looking at the duration at .020", .050" and .200". The .020" number determines how responsive the motor will be and how much low end torque the motor will make. The .050" number is used to estimate where peak power will occur, and the .200" number gives an estimate of the power potential.

In Conclusion, duration determines how many crankshaft degrees a camshaft maintains more than a given tappet lifts.

Maintenance

The rockers or cam followers sometimes incorporate a mechanism to adjust and set the valve play through manual adjustment, but most modern auto engines have hydraulic lifters, eliminating the need to adjust the valve lash at regular intervals as the valve train wears, and in particular the valves and valve seats in the combustion chamber.

The surfaces of the cam and follower are designed to "wear in" together, and therefore when either is replaced, the other should be as well to prevent excessive rapid wear. Sliding friction between the surface of the cam and the cam follower which rides upon it is considerable. In order to reduce wear at this point, the cam and follower are both surface hardened, and modern lubricant motor oils contain additives specifically to reduce sliding friction. In some engines, the flat contact surfaces are replaced with rollers, which eliminate the sliding friction and wear but add mass to the valvetrain.

 

© Copyright: All database of car parts, car parts, truck parts and pictures belong to Auto Body Parts Online. Terms & Conditions
Technical questions? Contact the
Webmaster
Powered by Auto Body Parts Online