VTEC vs VVTL-i palyginimas [EN]

Manau, daugeliui bus idomu.

VTEC = variable lift/timing/duration system with two different profile cams for each valve which change the lift, duration, and timing. VTEC is NOT continuously variable, it is a staged system based on RPM.

VVTi = continuously adjustable intake cam shaft which allows for the timing to be adjusted according to RPM. Valve duration and lift is completely unaffected as the same cam lobes are used throughout.

VVTLi = continuously adjustable intake cam shaft, as in VVTi, but with a second cam lobe which engages at a preset RPM in the ECU. The second lobe affects lift and duration. Timing is still being adjusted by the variable camshaft.

iVTEC = Read VVTLi, but I think they might have an adjustable exhaust cam shaft as well. As we can see by the power numbers it has minimal affect on performance.

iVTEC and VVTLi adjust the cam shaft timing in EXACTLY the same manner. So far all cam shafts are adjusted the same way, whether it be VVTi, iVTEC, or BMW's Vanos, they all use a screw type mechanism to adjust the timing. I'll post a picture of the system if anyone requests. THE ONLY DIFFERENCE BETWEEN THE LIFT ON VVTLi AND VTEC(or iVTEC) IS THE WAY IN WHICH THE SECOND CAM LOBE ENGAGES ITSELF.

VTEC uses hydraulic pressure and metal rods to connect up a second rocker arm being driven by the high RPM cam lobe. When locked up the whole rocker assembly is now driven by the high RPM cam lobe, thus changing the valves behavior to the high RPM cam profile.

VVTLi uses a freely moving rod in the main rocker arm to allow the high RPM cam lobe to not affect the valves. When engaged a small stopper pin is pushed underneath the freely moving rod, thus taking away the space it had to move freely in. The rod then touches the pin which allows the high RPM cam profile to affect the rocker arm and valve behavior. Think of it this way, get a pencil and hold it 1cm above a button. Now move the pencil down 1cm and then up 1cm, repeat forever. You will never push the button in. Now what if someone stuck a 1cm high block between your pencil and the button. You would now hit the block and in turn make the block push the button. Same thing with VVTLi's lift.

Šaltinis newcelica.org http://newcelica.org/forums/showthread.php?t=20280

blin kur ta L raide gauti

galiu duot 2 lift'o varstus.. nuo to ir pradek joke.. geru SVENCIU tarp kitko

swapa imanoma padaryti.. nors paprsciau pakeisti masina
ar tavo zmonai truksta galios?

man truksta kai persedu gerai kad valdymas kompensuoja.