Tag Archives: lobes

Understanding the Cam Shaft in Your Engine Part – III

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Engine

The various configurations of the cam shaft will be discussed here. The 3 different camshafts are – single overhead cam, double overhead cam and the pushrod.

Single Overhead Cam (SOHC) – One cam per head indicates single overhead cam. Any inline 4 or 6 cylinder engines will have one cam. V-6 or V-8 engines will have 2 cams but one for each of the heads. The rocker arms of the cam presses down on the valves in order to open them. The valves come back to their positions with the help of extremely strong springs.

Double Overhead Cam (DOHC) – Two cams per head indicate double overhead cam. An inline engine will have 2 cams and V engines will have 4 cams but 2 on each head. Engines with 4 or more than 4 valves per cylinder have double overhead cams. A double cam shaft is capable of fitting enough lobes to work all the valves.

The crankshafts drive the cams in the double and single overhead cam engines with the help of a belt or a chain. These are known as the timing chain or the timing belt. If the chain or the belt breaks, the cam will not be able to spin anymore. The piston will hit the valves that are open. So these need to be changed or adjusted at regular intervals.     

For more information about the configurations of the cam shaft in your engine, do visit the New Jersey State Auto Auction today.

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New Jersey State Auto Auction

406 Sip Avenue

Jersey City, New Jersey 07306

Phone: 201.355.4138

Website: www.NJStateAuto.com

 

Understanding the Cam Shaft in Your Engine Part – II

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Engine

In the earlier article we discussed about the general importance of the cam, the lobes and the cam shafts. We will now discuss about the basics of the cam shaft. The most important part of the cam shaft is the lobes. Their shape determines the performance of the engine. Variable cam shafts give better results. A fixed cam shaft is always bad for your engine.

When the piston moves downwards to allow for the intake of the air and fuel mixture, the intake valve opens. The intake stroke is called the top dead center or TDC. The intake valve closes when the piston reaches the bottom.

The exhaust valve opens just as the piston reaches the bottom. The combustion stroke is called the bottom dead center or BDC. The exhaust valve closes when the piston finishes the exhaust stroke. The valves are closing and opening at least 33 times a second when the engine is working at a high speed.

The piston is moving at a faster rate too. The air and fuel mixture, then, is also moving quickly and running into the engine cylinder. The longer the lobe remains open, the faster is the intake of the mixture. The faster the intake, the faster the cylinder accelerates. The end result is a faster and better performing engine.

To know more about how the cam shaft in your engine works, do visit the New Jersey State Auto Auction.

#NJSAA

#NJStateAuto

#NJStateAutoAuction

New Jersey State Auto Auction

406 Sip Avenue

Jersey City, New Jersey 07306

Phone: 201.355.4138

Website: www.NJStateAuto.com

 

Understanding the Cam Shaft in Your Engine

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Posted in Uncategorized

Engine

The cam is a rotating piece in the engine of a vehicle that transforms linear motion into rotary motion and vice versa. The shaft around which the cam rotates is called the cam shaft. The operation of the cam shaft is extremely crucial in the performance of the engine.

The cams or lobes in the shaft push against the valves that allow the passage of air and fuel mixture in and out of the engine. The cam shafts rotate to open and close these valves in rhythm with the motion of the piston. The shape of the cam lobes influences the performance of the engine at different speed levels.

Different engine layouts have different cams. These affect the performance of the engine differently at different speeds. There are generally three different kinds of cams on engines – single overhead cam (SOHC) and double overhead cam (DOHC) and pushrods. A particular camshaft will be perfectly suitable at only a particular engine speed.

So, different cam profiles are needed for different engine speeds. The faster the engine moves, the faster the air and fuel mixture moves. So, preferably, the valves need to be open wider and for a longer period of time at higher speeds in order to improve the performance of the engine. The different shapes of the lobes help in this.

If you would like to know more about the cam shaft in your engine, do visit the New Jersey State Auto Auction or have a look at their website today.

#NJSAA

#NJStateAuto

#NJStateAutoAuction

New Jersey State Auto Auction

406 Sip Avenue

Jersey City, New Jersey 07306

Phone: 201.355.4138

Website: www.NJStateAuto.com