What is Variable Valve Timing?

1 minuteread

Variable Valve Timing:

There are a pair of novel ways by which carmakers vary the valve timing. One­ system used on some Honda engines is named VTEC.

VTEC (Variable Valve Timing and Lift Electronic Control) is an electronic and system in some Honda engines that permits the engine to own multiple camshafts. VTEC engines have an additional intake cam with its rocker, which follows this cam. The profile on this cam keeps the valve open longer than the opposite cam profile. At low engine speeds, this rocker isn’t connected to any valves. At high engine speeds, a piston locks the additional rocker to the 2 rockers that control the 2 intake valves.


Advance Valve Timing:

Some cars use a tool that may advance the valve timing. This doesn’t keep the valves open longer; instead, it opens them later and closes them later. This can be done by rotating the camshaft ahead of some degrees. If the intake valves normally open at 10 degrees before top dead center (TDC) and shut at 190 degrees after TDC, the entire duration is 200 degrees. The opening and shutting times will be shifted employing a mechanism that rotates the cam ahead a bit because it spins. Therefore the valve might open at 10 degrees after TDC and shut at 210 degrees after TDC. Closing the valve 20 degrees later is sweet, but it’d be better to be able to increase the duration that the valve is open.

Several engine manufacturers are experimenting with systems that might allow infinite variability in valve timing. For instance, imagine that every valve had a solenoid thereon that would open and shut the valve using computer control instead of hopping on a camshaft. With this kind of system, you’d get maximum engine performance at every RPM. Something to appear forward to within the future.

A to Z All Answers About Japan Used Cars

Technical FAQ's

Read and learn about car Technical FAQ and get in-depth details of the car features.


Japan Auto Auction

Check out the details and procedure to buy used cars from Japan auto auction.


Japan Used Car Inspection

Read and get instant knowledge about the procedures of Japan used car Inspection.


Overseas Freight

Check out Overseas Freight Rates and Charges Details to import Japan used cars in your country.


Import Documentation

Read about the procedure & documents required while importing used vehicles from Japan.



Check out and read how is shipping done and how a car is being shipped from one country to another country.



Avoid fraud & scams and make a secure payment to import used cars from Japan to anywhere across the globe.


General FAQ's

Read and get the basic knowledge about car maintenance, and in-depth details of cars.


Import Regulations

Check out the rules & regulations in all countries to import Japan used cars.


Japan Used Cars

Check out the details of the best Japan used cars and how to buy them.


Previous Post
Next Post

Related Knowledge Base Posts

Leave a Reply

Your email address will not be published. Required fields are marked *

Want to Buy Used Cars from Japan?

More than 70,000 Japanese Used Cars available on sale from trusted Japan Car Exporters

What Is Jct Images


JapaneseCarTrade.com (JCT) the most trusted & free Japan used vehicle portal that connects overseas buyers to Japan used vehicle exporters since 2005.
JCT does not charge any commission, transaction fee or any hidden cost from buyer or exporter. All deals are directly between buyers & exporters that is saves your hard earned money from 10% ~ 50% of car cost.

JCT is associated with JUMVEA (Japan Used Motor Vehicles Exporters Association), SAFE TRADE (JUMVEA Safe Trade for 100% Money Back Guarantee), SLAAJ (Sri Lanka Automobile Exporters Association in Japan) & SLBCJ (Sri Lanka Business Council of Japan) to connect established, trusted & reliable exporters for safe & secured business from Japan.

Welcome to Our Website