How does the DOHC engine work. For any die-hard Honda fan, the term i-VTEC or VTEC would be synonymous to top-notch performance and fuel efficiency. If you are curious to know how the VTEC does its magic, you are at the right place. But before knowing how the VTEC works, let’s have a look at how a basic DOHC engine functions. The power output of a VTEC engine is quite impressive. With a maximum boost pressure of 20.5 psi, the 2.0-liter VTEC Turbo engine delivers a whopping 272 horsepower at 6,500 rpm and a substantial 280 lb.-ft. of torque from 1,600 to 4,500 rpm. How Much Power Does a VTEC Have? Modern variable valve timing systems are doing the same job as the EGV valve, only better. A VVT system is able to control the timing of the exhaust valve so that the right amount of inert ­exhaust gases remain in the combustion chamber for the next combustion cycle. This controls combustion temperatures and the production of NOx. This allows for increased power output when the engine is under load or during high-performance driving. The exact RPM at which the VTEC system kicks in can vary from vehicle to vehicle, but typically it will occur somewhere between 4,500 and 6,000 RPMs. Some vehicles may have a higher or lower threshold for when the VTEC system begins to operate. Also there is a VTEC oil pressure switch expecting to see oil pressure when the VTEC solenoid is activated. No, oil pressure is sensed by ECU to ensure that there is sufficient oil pressure before VTEC mechanism is activated. ie VTEC will not work if oil pressure is too low. World's only Insight with: - 80A alternator. . In order to have better control over valve timing, Honda created and combined what is known as i-VTEC, or VTC with VTEC. Variable timing control (VTC) allows the camshaft to be advanced or retracted in order to manage valve overlap. The exhaust valve never opened and closed simultaneously in conventional VTEC engines because the intake valve A two-stroke engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston during only one crankshaft revolution At higher engine speeds, many VVT systems change to a more aggressive (i.e. high lift and high duration) cam lobe profiles. Some variable valve lift systems shift the camshaft axially so that a Thanks to skillshare for sponsoring this episode! The first 1000 people to sign up at this link in the will get their first 2 months FREE! So go to: Such engines are set to a single cam profile, whereby what works for a high RPM doesn’t work for a low one. Enter the VTEC Engine. VTEC works by modifying your engine’s cam profile and ensures transitions from high to low RPM (and vice versa) are smooth and indetectable. The camshafts are vital in this process as they control the valves.

how does a vtec engine work