SoSublime
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There seems to be some confusion, compounded by Honda as well, on whether the 1.5L is VTEC or not.
Short answer: No, it is not VTEC.
Long answer: The 1.5L Turbo engine features dual VTC on both the Intake and Exaust camshaft. This affects Valve timing only. In essence it does what VTEC does in that it is variable valve timing, minus the lift.
In laymans terms, think of lift as how far the valves open. Without VTEC they open only to a certain set height on a smaller lobe, with VTEC engaged the valve is opened by a larger lobe, resulting in a valve that is opened wider for longer.
VTC does change how long the valve stays open affecting valve timing and overlap, with the focus done on scavenging, but it does not affect lift at all. The valves always open to a certain set height due to only one size lobe being present. This helps by increasing turbo response at lower rpms and also lowering combustion chamber temperatures.
So no, even though Honda refers to the engines as "VTEC turbos" they are not because, well, they are not VTEC, they simply use VTC technology based on VTEC technology. Accurately they are simply VTC turbos.
In a real life scenario? You will probably recieve more benefit from the continuous VTC over the situational VTEC due to increased scavenging, lower combustion chamber temperatures, and increased turbo response.
Short answer: No, it is not VTEC.
Long answer: The 1.5L Turbo engine features dual VTC on both the Intake and Exaust camshaft. This affects Valve timing only. In essence it does what VTEC does in that it is variable valve timing, minus the lift.
In laymans terms, think of lift as how far the valves open. Without VTEC they open only to a certain set height on a smaller lobe, with VTEC engaged the valve is opened by a larger lobe, resulting in a valve that is opened wider for longer.
VTC does change how long the valve stays open affecting valve timing and overlap, with the focus done on scavenging, but it does not affect lift at all. The valves always open to a certain set height due to only one size lobe being present. This helps by increasing turbo response at lower rpms and also lowering combustion chamber temperatures.
So no, even though Honda refers to the engines as "VTEC turbos" they are not because, well, they are not VTEC, they simply use VTC technology based on VTEC technology. Accurately they are simply VTC turbos.
In a real life scenario? You will probably recieve more benefit from the continuous VTC over the situational VTEC due to increased scavenging, lower combustion chamber temperatures, and increased turbo response.
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