Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [camshaft]

A shaft in an ICE that actuates components that open valves into the combustion chamber to allow the flow of necessary gasses in order for a combustion process to function.

The image below depicts an exhaust and an intake camshaft for a DOHC ICE

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In the image below that camshafts can be see at the top of the engine.

This image is of a 4 cycle DOHC (Dual Overhead Cam) design.

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An Image of a cam lobe, a component of the camshaft

enter image description here

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Changing Firing Order in a 4 Cylinder Car

Backstory In motorcycling you can get cams that change the firing order and time from a traditional 1,3,4,2. It's was very common in American road racing in the 1990's to hear 4 Cylinder engines that sounded like two cylinder v-twins. The way these…
DucatiKiller
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Why did Ducati decide to use the desmodromic valve train rather than a more tradition valve train?

Ducati's use a unique method to open and close their valves. It's called the desmodromic valve train. The desmodromic valve system does not use springs to close the valve, it uses the cam and has a valve closing lobe. What are the benefits to…
DucatiKiller
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How are rotary valves sealed

I have been looking for information on how rotary valves are sealed, but have not had much luck. Coates has engines with them, and they are oil less to boot or so they claim, but how do you get them to seal during a compression stroke? The only…
Cc Dd
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When does it make sense to replace a camshaft?

Preamble (Rant) I was reviewing this question in which the OP presents a repair quotation that includes replacing the "intake camshaft" to fix an engine that had overheated. To me this recommendation is incredulous. I can understand the need to…
Zaid
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What is meant by degreeing a cam?

In the hot rodding world, "degreeing the cam" is an often used term when installing an aftermarket camshaft. What does the term mean, what does it do for you, why should you do it, and what are the procedures/tools used to perform it?
Pᴀᴜʟsᴛᴇʀ2
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What exactly is a jackshaft?

The Wikipedia entry for the Ford Cologne 4.0L SOHC describes the use of a "jackshaft": It uses a jackshaft in place of a camshaft to drive a timing chain to each cylinder head. Three timing chains are used, one from the crank to the jackshaft, one…
Zaid
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"Valve like" noise after modifying camshaft ninja 300

A friend and I bought a modified camshaft for his ninja 300/EX 300. After installing and checking/adjusting valve clearance everything seemed ok. After a few laps on our local track the bike started making a noise similar to when the valves are a…
Aerim
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Formula 1 valve trains

There was a statement in a post regarding Formula 1 valve trains being pneumatic or magnetic. Are there valve trains driven magnetically or pneumatically that are on the market? When did they start using these kinds of valve trains? Does this…
Ppoggio
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Scatter Camshafts - What are they and why do I want one?

It seems in the world on mini's as in Mini Cooper, there is a camshaft called a scatter cam. It changes the timing for cylinders 2 and 3. I've heard of changing the timing to have 1 and 4 firing at the same time as well as 2 and 3 on 4-cylinder…
DucatiKiller
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Why is there a difference in timing belt replacement intervals between two countries

Specifically, the Subaru WRX sold in South Africa and Australia is 100% identical. And I mean that South Africa gets the Australian version of the WRX, there's no homologated version for SA. Well, there is one difference: the service booklet of the…
Captain Kenpachi
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Is it right to say that VTEC is solely by Honda?

I have an i-VTEC engine, which Honda claims to be a better and computerized version of their famous VTEC Engine. Now I am wondering: Is it right to tell people that only HONDA has VTEC? or is this technology distributed to other manufacturers as a…
Jomar Sevillejo
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What are Performance Camshafts?

I read the following question recently: What is it about performance cams that make engines produce more power when they are installed? I know there are a few components for cars that have "cam" in the name, like "camshaft", "cam belt", "cam…
Max Goodridge
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What is Lobe Separation Angle (LSA)?

What is Lobe Separation Angle (LSA) and how is it used in camshaft design? How is it measured? What difference does a long or short LSA make?
Pᴀᴜʟsᴛᴇʀ2
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How does Valve Overlap affect emissions?

In this question, it is suggested that valve overlap can affect emissions. In what way can valve overlap affect emissions?
Pᴀᴜʟsᴛᴇʀ2
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Where do the Camshaft Go?

I am new to understand engines. One thing that got me confused is the location of the camshaft. At first I seen it go above the valve so I thought it sat in the cylinder head. Now as I'm watching videos and reading more, it states that the camshaft…
user15938
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