Manufacturers usually guess how the engine will be used, and will then tune the valve timing to that speed. For instance, a sedan would probably run the most efficiently at medium engine speeds, while a sports car might run more efficiently at a higher RPM. VVT allows the best of both worlds by adjusting the cam to match the engine revolutions.
VTEC stands for Variable Valve Timing and Lift Electronic Control. :thmsup: On the J30A4, VTEC engages at 4,900 RPM. On some engines you'll feel VTEC engage and others you won't. Most DOHC VTEC I4 engines, such as the B18 or H22 for example, have a very noticeable difference when VTEC engages.
Keeping up the tradition of bringing exclusive content for readers, this time too, we have brought an educational video to let you guys know how a Vtec engin
Honda vehicles use a variable valve timing system known as VTEC, which stands for Variable Valve Timing with Electronic Control. Briefly, since this system uses pressurized engine oil to activate the valve timing system, an oil pressure switch is employed to monitor the status of the VTEC system, as opposed to monitoring the actual oil pressure
Hence the name Dual Overhead Camshaft (DOHC). The camshaft is a rotating shaft with lobes (or cams) that will open the engine’s valves when they come into contact. This configuration is generally better than Single Overhead Camshaft (SOHC) and Overhead Valves (OHV) since it allows the engine to rev higher.
The VVT system is a 2-stage hydraulically controlled cam phasing system. VVT-i varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt or chain) and intake camshaft. Engine oil pressure is applied to an actuator to adjust the camshaft position. Adjustments in the overlap time between the exhaust
Once the VTEC solenoid in your Honda is activated, it uses oil pressure to push an engaging pin through your valvetrain. This activates the larger lobe of your camshaft, which increases duration and extends lift of your valves. Image courtesy ADPTraining. What this does is allows your Honda engine to run efficiently and with low emissions at
The Pilot is a mass-produced vehicle made by Honda so they are relatively easy to work on and parts are affordable. The most common problem that has been reported with the Pilot is warped brake rotors. These have been known to get warped around 50,000 miles and they cost about $200 to $250 to replace.
Honda does still use VTEC, but it’s no longer present in the same way as in the days of yore. It’s normally accompanied by a turbocharger and in the case of the Civic Type-R, the VTEC camshaft is located on the exhaust side of the engine, not the intake side as in previous renditions.
A simple valve and engine cross-section. Variable valve timing enables these different behaviours by changing how the intake and exhaust valves work at different engine speeds. Thus, it helps optimise the engine’s performance, whilst also improving fuel economy and emissions.
Weight. Long Block ≈ 395 lbs. Horsepower. 130-197 bhp @ 6,000-8,000 RPM. Torque (lb-ft) 121-133 lb-ft @ 5,000 – 7,500 RPM. The Honda B18 shares many of the same attributes as the B16 engine that preceded it. The B18 features an aluminum block and aluminum head, making it a light engine at just 395 lbs.
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how does a vtec engine work
