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Camshafts & Components

The camshaft, or cam for short, opens and closes the intake and exhaust valves, allowing the fresh air/fuel mixture to enter the cylinder for combustion, and the spent gases to flow out. Most production cams are iron castings that are supported on journals that rotate in bearings, with individual eccentric lobes to actuate each valve. A single cam can be located in the cylinder block, or one or two cams can be mounted on the cylinder head.

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On Over Head Valve (OHV) engines, the block mounted cam actuates the valves via lifters that ride on the lobes, pushrods that transfer motion up to the cylinder head, and rocker arms that pivot on shafts or studs. Single Over Head Cam (SOHC) engines operate the valves using followers or pivoting rocker arms, while Double Over Head Cam (DOHC) engines, which have separate cams for the intake and exhaust valves, employ buckets between the cam and valves.

We aim to provide our customers with the finest Camshafts & Components the industry can offer, which is why we accept no compromise when it comes to the quality. Created by the most reputable names in the industry, such as Dorman, Mopar, National, Timken, Auto 7, Hitachi, Bosch, Cloyes, Continental ContiTech, Delphi, Ajusa, Fel-Pro, Victor Reinz, WAI Global the Camshafts & Components we've gathered for you feature precise design and everlasting durability.

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The crankshaft drives the cam(s) using a timing chain and gears or timing belt and sprockets, at ½ crankshaft speed. The camshaft must be timed with the crankshaft so that valve opening and closing is perfectly synchronized with piston movement. On performance engines, valve timing can be fine-tuned by advancing or retarding the cam, to achieve desired power characteristics. Along with timing, valve lift and duration are also great engine power production factors and these too are determined by the cam’s lobe profile.

Duration is the length of time that the valve is open. Duration is increased on performance camshafts to increase flow for more high rpm power. Lift is the distance the valve is raised from its seat. On vehicles with rocker arms the lobe lift can be increased by the rocker arm ratio, so there is a lobe lift and a valve lift specification. Lobe profile can also differ between solid lifter and hydraulic lifter camshafts. The former require a certain amount of clearance, or lash, during operation and require periodic adjustment. Hydraulic lifters have a plunger and spring inside an oil-filled cavity to compensate for expansion.

Lifters can be further segregated according to whether they are flat tappets or rollers. Flat tappet cam lobes are ground with a taper to allow the lifter to rotate, otherwise the lobe and bottom of the lifter would quickly wear. Because the wear pattern is unique to each lobe, if components are reused they must be reinstalled in the same position. Flat tappet cams should always be installed with new lifters. The significantly reduced friction enables roller lifter cams to be much more durable than flat tappet designs, and as long as the roller wheels and bearings are in good shape, roller lifters can be reused.

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Guides & Articles
This article will guide you through a generic tune up on most any car or light duty gasoline-powered vehicle built within the last 20 years or so. We will presume that you are tuning up your engine because it has reached the mileage or time point to do so, and that you are NOT performing a tune up to cure an engine performance defect. We make this distinction...
Does your ride have timing gears, a timing belt, or a timing chain? Is one better than the other? And perhaps most importantly, do I need to be concerned about the recommendation to replace the timing belt at a certain mileage interval? Welcome to our discussion of "engine timing".
Internal combustion engines are extremely complex and feature a wide array of components that rotate, move up and down, pump, seal, or remain stationary. When repairing or rebuilding your engine, you will come across many different terms when referencing repair manuals and ordering parts. We know it can be confusing, especially when the repair is complex. Even if...
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Camshafts Reviews
Average rating: 4.5 4.6 - 9 reviews
2002 Audi TT | Posted by Connor | (Sherwood, OR)

Overall shipping time was what I expected. Good product and fits directly. No issues so far. Good website to source car parts.

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